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\n  \n 2024\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Quantifying earthworm soil ingestion from changes in vertical bulk density profiles.\n \n \n \n \n\n\n \n Larsbo, M.; Koestel, J.; Krab, E. J.; and Klaminder, J.\n\n\n \n\n\n\n European Journal of Soil Biology, 120: 103574. March 2024.\n \n\n\n\n
\n\n\n\n \n \n \"QuantifyingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{larsbo_quantifying_2024,\n\ttitle = {Quantifying earthworm soil ingestion from changes in vertical bulk density profiles},\n\tvolume = {120},\n\tissn = {1164-5563},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1164556323001103},\n\tdoi = {10.1016/j.ejsobi.2023.103574},\n\tabstract = {Soil mixing by earthworms can have a large impact on the fate of nutrients and pollutants and on the soil's ability to sequester carbon. Nevertheless, methods to quantify earthworm ingestion and egestion under field conditions are largely lacking. Soils of the Fennoscandian tundra offer a special possibility for such quantifications, as these soils commonly lack burrowing macrofauna and exhibit a well-defined O horizon with low bulk density on top of a mineral soil with higher density. Since ingestion-egestion mixes the two soil layers, the temporal changes in the bulk density profile of such soils may be useful for estimating field ingestion rates. In this study, we applied a model for earthworm burrowing through soil ingestion to observed changes in soil densities occurring in a mesocosm experiment carried out in the arctic during four summers with intact soil. The earthworms present in the mesocosms were Aporrectodea trapezoides, Aporrectodea tuberculata, Aporrectodea rosea, Lumbricus rubellus and Lumbricus Terrestris (fourth season only). We show that changes in soil density profiles can indeed be used to infer earthworm ingestion rates that are realistic in comparison to literature values. Although uncertainties in parameter values were sometimes large, the results from this study suggest that soil turnover rates and endogeic earthworm soil ingestion rates in tundra heath and meadow soils may be as high as those reported for temperate conditions. Such large ingestion rates can explain observed large morphological changes in arctic soils where dispersing earthworms have resulted in complete inmixing of the organic layer into the mineral soil. Our approach is applicable to soil profiles with marked vertical differences in bulk density such as the soils of the Fennoscandian tundra where earthworms are currently dispersing into new areas and to layered repacked soil samples that are incubated in the field.},\n\turldate = {2024-03-26},\n\tjournal = {European Journal of Soil Biology},\n\tauthor = {Larsbo, M. and Koestel, J. and Krab, E. J. and Klaminder, J.},\n\tmonth = mar,\n\tyear = {2024},\n\tpages = {103574},\n}\n\n\n\n
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\n Soil mixing by earthworms can have a large impact on the fate of nutrients and pollutants and on the soil's ability to sequester carbon. Nevertheless, methods to quantify earthworm ingestion and egestion under field conditions are largely lacking. Soils of the Fennoscandian tundra offer a special possibility for such quantifications, as these soils commonly lack burrowing macrofauna and exhibit a well-defined O horizon with low bulk density on top of a mineral soil with higher density. Since ingestion-egestion mixes the two soil layers, the temporal changes in the bulk density profile of such soils may be useful for estimating field ingestion rates. In this study, we applied a model for earthworm burrowing through soil ingestion to observed changes in soil densities occurring in a mesocosm experiment carried out in the arctic during four summers with intact soil. The earthworms present in the mesocosms were Aporrectodea trapezoides, Aporrectodea tuberculata, Aporrectodea rosea, Lumbricus rubellus and Lumbricus Terrestris (fourth season only). We show that changes in soil density profiles can indeed be used to infer earthworm ingestion rates that are realistic in comparison to literature values. Although uncertainties in parameter values were sometimes large, the results from this study suggest that soil turnover rates and endogeic earthworm soil ingestion rates in tundra heath and meadow soils may be as high as those reported for temperate conditions. Such large ingestion rates can explain observed large morphological changes in arctic soils where dispersing earthworms have resulted in complete inmixing of the organic layer into the mineral soil. Our approach is applicable to soil profiles with marked vertical differences in bulk density such as the soils of the Fennoscandian tundra where earthworms are currently dispersing into new areas and to layered repacked soil samples that are incubated in the field.\n
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\n \n\n \n \n \n \n \n \n Cascading effects of earthworm invasion increase graminoid density and rodent grazing intensities.\n \n \n \n \n\n\n \n Jonsson, H.; Olofsson, J.; Blume-Werry, G.; and Klaminder, J.\n\n\n \n\n\n\n Ecology, 105(2): e4212. 2024.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.4212\n\n\n\n
\n\n\n\n \n \n \"CascadingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{jonsson_cascading_2024,\n\ttitle = {Cascading effects of earthworm invasion increase graminoid density and rodent grazing intensities},\n\tvolume = {105},\n\tcopyright = {© 2023 The Authors. Ecology published by Wiley Periodicals LLC on behalf of The Ecological Society of America.},\n\tissn = {1939-9170},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ecy.4212},\n\tdoi = {10.1002/ecy.4212},\n\tabstract = {Human-mediated dispersal of non-native earthworms can cause substantial changes to the functioning and composition of ecosystems previously earthworm-free. Some of these earthworm species have the potential to “geoengineer” soils and increase plant nitrogen (N) uptake. Yet the possible consequences of increased plant N concentrations on rodent grazing remains poorly understood. In this study, we present findings from a common garden experiment with two tundra communities, meadow (forb dominated) and heath (shrub dominated), half of them subjected to 4 years of earthworm presence (Lumbricus spp. and Aporrectodea spp.). Within four summers, our earthworm treatment changed plant community composition by increasing graminoid density by, on average, 94\\% in the heath vegetation and by 49\\% in the meadow. Rodent winter grazing was more intense on plants growing in soils with earthworms, an effect that coincided with higher N concentrations in plants, indicating a higher palatability. Even though earthworms reduced soil moisture, plant community productivity, as indicated by vegetation greenness (normalized difference vegetation index), was not negatively impacted. We conclude that earthworm-induced changes in plant composition and trophic interactions may fundamentally alter the functioning of tundra ecosystems.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2024-03-26},\n\tjournal = {Ecology},\n\tauthor = {Jonsson, Hanna and Olofsson, Johan and Blume-Werry, Gesche and Klaminder, Jonatan},\n\tyear = {2024},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecy.4212},\n\tkeywords = {Lumbricidae, earthworms, grazing, non-native, plant community, soil moisture, tundra, ⛔ No DOI found},\n\tpages = {e4212},\n}\n\n\n\n
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\n Human-mediated dispersal of non-native earthworms can cause substantial changes to the functioning and composition of ecosystems previously earthworm-free. Some of these earthworm species have the potential to “geoengineer” soils and increase plant nitrogen (N) uptake. Yet the possible consequences of increased plant N concentrations on rodent grazing remains poorly understood. In this study, we present findings from a common garden experiment with two tundra communities, meadow (forb dominated) and heath (shrub dominated), half of them subjected to 4 years of earthworm presence (Lumbricus spp. and Aporrectodea spp.). Within four summers, our earthworm treatment changed plant community composition by increasing graminoid density by, on average, 94% in the heath vegetation and by 49% in the meadow. Rodent winter grazing was more intense on plants growing in soils with earthworms, an effect that coincided with higher N concentrations in plants, indicating a higher palatability. Even though earthworms reduced soil moisture, plant community productivity, as indicated by vegetation greenness (normalized difference vegetation index), was not negatively impacted. We conclude that earthworm-induced changes in plant composition and trophic interactions may fundamentally alter the functioning of tundra ecosystems.\n
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\n \n\n \n \n \n \n \n \n Guiding downstream migrating Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) of different life stages in a large river using bubbles.\n \n \n \n \n\n\n \n Leander, J.; Hellström, G.; Nordin, J.; Jonsson, M.; and Klaminder, J.\n\n\n \n\n\n\n Rivers Research and Applications: an international journal devoted to river research and management, 40(1): 107–115. 2024.\n Publisher: John Wiley & Sons\n\n\n\n
\n\n\n\n \n \n \"GuidingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{leander_guiding_2024,\n\ttitle = {Guiding downstream migrating {Atlantic} salmon ({Salmo} salar) and brown trout ({Salmo} trutta) of different life stages in a large river using bubbles},\n\tvolume = {40},\n\turl = {https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186819},\n\tdoi = {10.1002/rra.4209},\n\tabstract = {Salmonid repeat spawners are precious individuals for wild populations due to their high fecundity and previous spawning experience, making them important in environmental policy. However, repeat s ...},\n\tlanguage = {eng},\n\tnumber = {1},\n\turldate = {2024-03-26},\n\tjournal = {Rivers Research and Applications: an international journal devoted to river research and management},\n\tauthor = {Leander, Johan and Hellström, Gustav and Nordin, Jonathan and Jonsson, Micael and Klaminder, Jonatan},\n\tyear = {2024},\n\tnote = {Publisher: John Wiley \\& Sons},\n\tkeywords = {⛔ No DOI found},\n\tpages = {107--115},\n}\n\n\n\n
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\n Salmonid repeat spawners are precious individuals for wild populations due to their high fecundity and previous spawning experience, making them important in environmental policy. However, repeat s ...\n
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\n  \n 2023\n \n \n (7)\n \n \n
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\n \n\n \n \n \n \n \n \n Erosion regime controls sediment environmental DNA-based community reconstruction.\n \n \n \n \n\n\n \n Morlock, M. A.; Rodriguez-Martinez, S.; Huang, D. Y.; and Klaminder, J.\n\n\n \n\n\n\n Environmental DNA, 5(6): 1393–1404. 2023.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/edn3.458\n\n\n\n
\n\n\n\n \n \n \"ErosionPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{morlock_erosion_2023,\n\ttitle = {Erosion regime controls sediment environmental {DNA}-based community reconstruction},\n\tvolume = {5},\n\tcopyright = {© 2023 The Authors. Environmental DNA published by John Wiley \\& Sons Ltd.},\n\tissn = {2637-4943},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/edn3.458},\n\tdoi = {10.1002/edn3.458},\n\tabstract = {Analysis of environmental DNA detected in lake sediments shows promise to become a great paleoecological technique that can provide detailed information about organism communities living in past environments. However, when interpreting sedimentary environmental DNA records, it is of crucial importance to separate ecosystem responses to large-scale environmental change from “noise” caused by changes in sediment provenance or potential post-depositional DNA mobility. In this study, we show that plant and mammalian communities reconstructed from sediments are strongly affected by sediment provenance, but unaffected by vertical mobility of DNA after sediment deposition. We observe that DNA from aquatic plants was abundant in background sediment, while embedded detrital event layers (sediment deposited under erosion events) primarily contained terrestrial plants; hence, vertical mobility of aquatic plant DNA across sediment layers was negligible within our studied lakes. About 33\\% of the identified terrestrial plant genera were only found in detrital sediment, suggesting that sediment origin had a strong impact on the reconstructed plant community. Similarly, DNA of some mammalian taxa (Capra hircus, Ursus arctos, Lepus, and Felis) were only or preferentially found in detrital event layers. Temporal changes across the Holocene were the main drivers of change for reconstructed plant communities, but sediment type was the second most important factor of variance. Our results highlight that erosion and sediment provenance need to be considered when reconstructing past mammalian and plant communities using environmental DNA from lake sediments.},\n\tlanguage = {en},\n\tnumber = {6},\n\turldate = {2024-03-27},\n\tjournal = {Environmental DNA},\n\tauthor = {Morlock, Marina A. and Rodriguez-Martinez, Saúl and Huang, Doreen Yu-Tuan and Klaminder, Jonatan},\n\tyear = {2023},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/edn3.458},\n\tkeywords = {DNA taphonomy, Lake Grosssee, Switzerland, erosion, lake sediment, paleoecology, sedaDNA},\n\tpages = {1393--1404},\n}\n\n\n\n
\n
\n\n\n
\n Analysis of environmental DNA detected in lake sediments shows promise to become a great paleoecological technique that can provide detailed information about organism communities living in past environments. However, when interpreting sedimentary environmental DNA records, it is of crucial importance to separate ecosystem responses to large-scale environmental change from “noise” caused by changes in sediment provenance or potential post-depositional DNA mobility. In this study, we show that plant and mammalian communities reconstructed from sediments are strongly affected by sediment provenance, but unaffected by vertical mobility of DNA after sediment deposition. We observe that DNA from aquatic plants was abundant in background sediment, while embedded detrital event layers (sediment deposited under erosion events) primarily contained terrestrial plants; hence, vertical mobility of aquatic plant DNA across sediment layers was negligible within our studied lakes. About 33% of the identified terrestrial plant genera were only found in detrital sediment, suggesting that sediment origin had a strong impact on the reconstructed plant community. Similarly, DNA of some mammalian taxa (Capra hircus, Ursus arctos, Lepus, and Felis) were only or preferentially found in detrital event layers. Temporal changes across the Holocene were the main drivers of change for reconstructed plant communities, but sediment type was the second most important factor of variance. Our results highlight that erosion and sediment provenance need to be considered when reconstructing past mammalian and plant communities using environmental DNA from lake sediments.\n
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\n \n\n \n \n \n \n \n \n Landscape of ice and fire – uniquely well-preserved Scots pine trunks reveal forest fires near the retreating Weichselian ice margin.\n \n \n \n \n\n\n \n Klaminder, J.; Fassl, M.; Baudet, M.; Östlund, L.; Linderholm, J.; and Zale, R.\n\n\n \n\n\n\n Vegetation History and Archaeobotany, 1. December 2023.\n \n\n\n\n
\n\n\n\n \n \n \"LandscapePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_landscape_2023,\n\ttitle = {Landscape of ice and fire – uniquely well-preserved {Scots} pine trunks reveal forest fires near the retreating {Weichselian} ice margin},\n\tvolume = {1},\n\tissn = {1617-6278},\n\turl = {https://doi.org/10.1007/s00334-023-00974-6},\n\tdoi = {10.1007/s00334-023-00974-6},\n\tabstract = {Environmental conditions for trees that established in central Fennoscandia shortly after the final retreat of the Weichselian ice sheet remain poorly understood. In this study we examine tree rings of five well-preserved Pinus sylvestris (Scots pines) that grew in the area in front of the retreating ice sheet in northern Sweden. They became buried in flood sediments deposited by a glacial outburst flood (jökulhlaup) about 9.5–9.9 kyr cal bp and the aim of our study was to search for information regarding damage from fires and bioclimatic conditions in their ancient tree ring records. Our analysis, providing a glimpse into the local early Holocene environment in north-central Sweden, suggests that: 1, there were repeated fires (four fire events detected) during the early Holocene; and 2, bioclimatic conditions when the ancient pines were growing resembled those of modern sub-alpine pine woods. The latter is indicated by their patterns of tree ring growth (growth rate and variation), which were statistically similar to those of pines growing in sub-alpine woods with an open canopy, but different from pines in protected and managed boreal forests. Lower δ13C for the ancient latewood in comparison to pine wood from trees growing near the Scandinavian mountains before the 1850s were probably caused both by stomata fractionation due to lower atmospheric CO2 during the early Holocene and by the moist local environment created by the nearby ancient Ancylus lake, which preceded the Baltic Sea. Periods with cloudy and cold summers were also indicated by the occurrence of ‘false rings’. Finds of charred fragments of Calluna vulgaris (heather, ling), an understory shrub that can burn even with a relatively high moisture content, suggest that heath vegetation was crucial to make fire a reoccurring ecological factor in the area during the early Holocene.},\n\tlanguage = {en},\n\turldate = {2024-03-27},\n\tjournal = {Vegetation History and Archaeobotany},\n\tauthor = {Klaminder, Jonatan and Fassl, Magdalena and Baudet, Marlène and Östlund, Lars and Linderholm, Johan and Zale, Rolf},\n\tmonth = dec,\n\tyear = {2023},\n\tkeywords = {Climate, Early Holocene, Forest fires, Forest history, Lycksele, Pinus sylvestris},\n}\n\n\n\n
\n
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\n Environmental conditions for trees that established in central Fennoscandia shortly after the final retreat of the Weichselian ice sheet remain poorly understood. In this study we examine tree rings of five well-preserved Pinus sylvestris (Scots pines) that grew in the area in front of the retreating ice sheet in northern Sweden. They became buried in flood sediments deposited by a glacial outburst flood (jökulhlaup) about 9.5–9.9 kyr cal bp and the aim of our study was to search for information regarding damage from fires and bioclimatic conditions in their ancient tree ring records. Our analysis, providing a glimpse into the local early Holocene environment in north-central Sweden, suggests that: 1, there were repeated fires (four fire events detected) during the early Holocene; and 2, bioclimatic conditions when the ancient pines were growing resembled those of modern sub-alpine pine woods. The latter is indicated by their patterns of tree ring growth (growth rate and variation), which were statistically similar to those of pines growing in sub-alpine woods with an open canopy, but different from pines in protected and managed boreal forests. Lower δ13C for the ancient latewood in comparison to pine wood from trees growing near the Scandinavian mountains before the 1850s were probably caused both by stomata fractionation due to lower atmospheric CO2 during the early Holocene and by the moist local environment created by the nearby ancient Ancylus lake, which preceded the Baltic Sea. Periods with cloudy and cold summers were also indicated by the occurrence of ‘false rings’. Finds of charred fragments of Calluna vulgaris (heather, ling), an understory shrub that can burn even with a relatively high moisture content, suggest that heath vegetation was crucial to make fire a reoccurring ecological factor in the area during the early Holocene.\n
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\n \n\n \n \n \n \n \n \n Tundra cryogenic land surface processes and CO2–C balance in sub-Arctic alpine environment withstand winter and spring warming.\n \n \n \n \n\n\n \n Väisänen, M.; Klaminder, J.; Ylänne, H.; Teuber, L.; Dorrepaal, E.; and Krab, E. J.\n\n\n \n\n\n\n Environmental Research: Climate, 2(2): 021001. March 2023.\n Publisher: IOP Publishing\n\n\n\n
\n\n\n\n \n \n \"TundraPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{vaisanen_tundra_2023,\n\ttitle = {Tundra cryogenic land surface processes and {CO2}–{C} balance in sub-{Arctic} alpine environment withstand winter and spring warming},\n\tvolume = {2},\n\tissn = {2752-5295},\n\turl = {https://dx.doi.org/10.1088/2752-5295/acc08b},\n\tdoi = {10.1088/2752-5295/acc08b},\n\tabstract = {Cryogenic land surface processes (CLSPs), such as cryoturbation, are currently active in landscapes covering 25\\% of our planet where they dictate key functions, such as carbon (C) cycling, and maintain patterned landscape features. While CLSPs are expected to diminish in the near future due to milder winters especially in the southern parts of the Arctic, the shifts in C cycling in these landscapes may be more complex, since climate change can affect C cycling directly but also indirectly via CLSPs. Here, we study the effects of changing winter and spring climate on CLSPs and C cycling in non-sorted circles consisting of barren frost boils and their vegetated rims. We do this by measuring cryoturbation and ecosystem CO2 fluxes repeatedly in alpine subarctic tundra where temperatures during naturally snow covered period have been experimentally increased with snow-trapping fences and temperatures during winter and spring period after snowmelt have been increased with insulating fleeces. Opposite to our hypothesis, warming treatments did not decrease cryoturbation. However, winter warming via deeper snow increased ecosystem C sink during summer by decreasing ecosystem CO2 release in the frost boils and by counterbalancing the negative effects of cryoturbation on plant CO2 uptake in the vegetated rims. Our results suggest that short-term changes in winter and spring climate may not alter cryoturbation and jeopardize the tundra C sink.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2024-03-27},\n\tjournal = {Environmental Research: Climate},\n\tauthor = {Väisänen, Maria and Klaminder, Jonatan and Ylänne, Henni and Teuber, Laurenz and Dorrepaal, Ellen and Krab, Eveline J.},\n\tmonth = mar,\n\tyear = {2023},\n\tnote = {Publisher: IOP Publishing},\n\tkeywords = {\\#nosource},\n\tpages = {021001},\n}\n\n\n\n
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\n Cryogenic land surface processes (CLSPs), such as cryoturbation, are currently active in landscapes covering 25% of our planet where they dictate key functions, such as carbon (C) cycling, and maintain patterned landscape features. While CLSPs are expected to diminish in the near future due to milder winters especially in the southern parts of the Arctic, the shifts in C cycling in these landscapes may be more complex, since climate change can affect C cycling directly but also indirectly via CLSPs. Here, we study the effects of changing winter and spring climate on CLSPs and C cycling in non-sorted circles consisting of barren frost boils and their vegetated rims. We do this by measuring cryoturbation and ecosystem CO2 fluxes repeatedly in alpine subarctic tundra where temperatures during naturally snow covered period have been experimentally increased with snow-trapping fences and temperatures during winter and spring period after snowmelt have been increased with insulating fleeces. Opposite to our hypothesis, warming treatments did not decrease cryoturbation. However, winter warming via deeper snow increased ecosystem C sink during summer by decreasing ecosystem CO2 release in the frost boils and by counterbalancing the negative effects of cryoturbation on plant CO2 uptake in the vegetated rims. Our results suggest that short-term changes in winter and spring climate may not alter cryoturbation and jeopardize the tundra C sink.\n
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\n \n\n \n \n \n \n \n \n The legacy of ecological imperialism in the Scandes: Earthworms and their implications for Arctic research.\n \n \n \n \n\n\n \n Jerand, P.; Klaminder, J.; and Linderholm, J.\n\n\n \n\n\n\n Arctic, Antarctic, and Alpine Research, 55(1): 2274650. December 2023.\n Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/15230430.2023.2274650\n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{jerand_legacy_2023,\n\ttitle = {The legacy of ecological imperialism in the {Scandes}: {Earthworms} and their implications for {Arctic} research},\n\tvolume = {55},\n\tissn = {1523-0430},\n\tshorttitle = {The legacy of ecological imperialism in the {Scandes}},\n\turl = {https://doi.org/10.1080/15230430.2023.2274650},\n\tdoi = {10.1080/15230430.2023.2274650},\n\tabstract = {In the nineteenth century, numerous settlements were established in the alpine region of Fennoscandia (the Scandes), an area that later became a major international scene for Arctic research. Here we raise awareness of this era and show that earthworm-driven bioturbation in “pristine” soils around contemporary Arctic research infrastructure is caused by soil fauna left behind during early land use. We use soil preserved under an alpine settlement to highlight that soils were not bioturbated when the first house was built at a site where bioturbation is now widespread. A review of archived material with unique site-specific chronology constrained the onset of bioturbation to the post-1871 era. Our results suggest that small-scale land use introduced earthworms that now thrive far beyond the realms of former cultivated fields. The legacy of soil fauna from this example of “ecological imperialism” still lingers and should be considered when studying soils of the Scandes.},\n\tnumber = {1},\n\turldate = {2024-03-26},\n\tjournal = {Arctic, Antarctic, and Alpine Research},\n\tauthor = {Jerand, Philip and Klaminder, Jonatan and Linderholm, Johan},\n\tmonth = dec,\n\tyear = {2023},\n\tnote = {Publisher: Taylor \\& Francis\n\\_eprint: https://doi.org/10.1080/15230430.2023.2274650},\n\tkeywords = {Archaeology, bioturbation, historical sources, phosphate analysis, soil classification},\n\tpages = {2274650},\n}\n\n\n\n
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\n\n\n
\n In the nineteenth century, numerous settlements were established in the alpine region of Fennoscandia (the Scandes), an area that later became a major international scene for Arctic research. Here we raise awareness of this era and show that earthworm-driven bioturbation in “pristine” soils around contemporary Arctic research infrastructure is caused by soil fauna left behind during early land use. We use soil preserved under an alpine settlement to highlight that soils were not bioturbated when the first house was built at a site where bioturbation is now widespread. A review of archived material with unique site-specific chronology constrained the onset of bioturbation to the post-1871 era. Our results suggest that small-scale land use introduced earthworms that now thrive far beyond the realms of former cultivated fields. The legacy of soil fauna from this example of “ecological imperialism” still lingers and should be considered when studying soils of the Scandes.\n
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\n \n\n \n \n \n \n \n \n Ideas and perspectives: Alleviation of functional limitations by soil organisms is key to climate feedbacks from arctic soils.\n \n \n \n \n\n\n \n Blume-Werry, G.; Klaminder, J.; Krab, E. J.; and Monteux, S.\n\n\n \n\n\n\n Biogeosciences, 20(10): 1979–1990. 2023.\n \n\n\n\n
\n\n\n\n \n \n \"IdeasPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
\n
@article{blume-werry_ideas_2023,\n\ttitle = {Ideas and perspectives: {Alleviation} of functional limitations by soil organisms is key to climate feedbacks from arctic soils},\n\tvolume = {20},\n\turl = {https://bg.copernicus.org/articles/20/1979/2023/},\n\tdoi = {10.5194/bg-20-1979-2023},\n\tnumber = {10},\n\tjournal = {Biogeosciences},\n\tauthor = {Blume-Werry, G. and Klaminder, J. and Krab, E. J. and Monteux, S.},\n\tyear = {2023},\n\tpages = {1979--1990},\n}\n\n\n\n
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\n \n\n \n \n \n \n \n \n The topological nature of tag jumping in environmental DNA metabarcoding studies.\n \n \n \n \n\n\n \n Rodriguez-Martinez, S.; Klaminder, J.; Morlock, M. A.; Dalén, L.; and Huang, D. Y.\n\n\n \n\n\n\n Molecular Ecology Resources, 23(3): 621–631. April 2023.\n Publisher: John Wiley & Sons, Ltd\n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{rodriguez-martinez_topological_2023,\n\ttitle = {The topological nature of tag jumping in environmental {DNA} metabarcoding studies},\n\tvolume = {23},\n\tissn = {1755-098X},\n\turl = {https://doi.org/10.1111/1755-0998.13745},\n\tdoi = {10.1111/1755-0998.13745},\n\tabstract = {Abstract Metabarcoding of environmental DNA constitutes a state-of-the-art tool for environmental studies. One fundamental principle implicit in most metabarcoding studies is that individual sample amplicons can still be identified after being pooled with others?based on their unique combinations of tags?during the so-called demultiplexing step that follows sequencing. Nevertheless, it has been recognized that tags can sometimes be changed (i.e., tag jumping), which ultimately leads to sample crosstalk. Here, using four DNA metabarcoding data sets derived from the analysis of soils and sediments, we show that tag jumping follows very specific and systematic patterns. Specifically, we find a strong correlation between the number of reads in blank samples and their topological position in the tag matrix (described by vertical and horizontal vectors). This observed spatial pattern of artefactual sequences could be explained by polymerase activity, which leads to the exchange of the 3? tag of single stranded tagged sequences through the formation of heteroduplexes with mixed barcodes. Importantly, tag jumping substantially distorted our data sets?despite our use of methods suggested to minimize this error. We developed a topological model to estimate the noise based on the counts in our blanks, which suggested that 40\\%?80\\% of the taxa in our soil and sedimentary samples were likely false positives introduced through tag jumping. We highlight that the amount of false positive detections caused by tag jumping strongly biased our community analyses.},\n\tnumber = {3},\n\turldate = {2023-07-22},\n\tjournal = {Molecular Ecology Resources},\n\tauthor = {Rodriguez-Martinez, Saul and Klaminder, Jonatan and Morlock, Marina A. and Dalén, Love and Huang, Doreen Yu-Tuan},\n\tmonth = apr,\n\tyear = {2023},\n\tnote = {Publisher: John Wiley \\& Sons, Ltd},\n\tkeywords = {a-DNA, detection limits, e-DNA, false positive, index hopping, sample crosstalk},\n\tpages = {621--631},\n}\n\n\n\n
\n
\n\n\n
\n Abstract Metabarcoding of environmental DNA constitutes a state-of-the-art tool for environmental studies. One fundamental principle implicit in most metabarcoding studies is that individual sample amplicons can still be identified after being pooled with others?based on their unique combinations of tags?during the so-called demultiplexing step that follows sequencing. Nevertheless, it has been recognized that tags can sometimes be changed (i.e., tag jumping), which ultimately leads to sample crosstalk. Here, using four DNA metabarcoding data sets derived from the analysis of soils and sediments, we show that tag jumping follows very specific and systematic patterns. Specifically, we find a strong correlation between the number of reads in blank samples and their topological position in the tag matrix (described by vertical and horizontal vectors). This observed spatial pattern of artefactual sequences could be explained by polymerase activity, which leads to the exchange of the 3? tag of single stranded tagged sequences through the formation of heteroduplexes with mixed barcodes. Importantly, tag jumping substantially distorted our data sets?despite our use of methods suggested to minimize this error. We developed a topological model to estimate the noise based on the counts in our blanks, which suggested that 40%?80% of the taxa in our soil and sedimentary samples were likely false positives introduced through tag jumping. We highlight that the amount of false positive detections caused by tag jumping strongly biased our community analyses.\n
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\n \n\n \n \n \n \n \n \n Holes in the tundra: Invasive earthworms alter soil structure and moisture in tundra soils.\n \n \n \n \n\n\n \n Klaminder, J.; Krab, E.; Larsbo, M.; Jonsson, H.; Fransson, J.; and Koestel, J.\n\n\n \n\n\n\n Science of The Total Environment, 859: 160125. February 2023.\n \n\n\n\n
\n\n\n\n \n \n \"HolesPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_holes_2023,\n\ttitle = {Holes in the tundra: {Invasive} earthworms alter soil structure and moisture in tundra soils},\n\tvolume = {859},\n\tissn = {0048-9697},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0048969722072254},\n\tdoi = {10.1016/j.scitotenv.2022.160125},\n\tabstract = {Human introductions have resulted in earthworms establishing in the Arctic, species known to cause cascading ecosystem change. However, few quantitative outdoor experiments have been performed that describe how these soil modifying earthworms are reshaping structures in tundra soils. In this study, we used three-dimensional (3-D) X-ray images of soil cores (approximately 10 cm diameter, 20 cm height, N = 48) to assess how earthworms (Aporrectodea sp. and Lumbricus sp.) affect soil structure and macropore networks in an outdoor mesocosm experiment that lasted four summers. Effects were assessed in both shrub-dominated (heath) and herb-dominated (meadow) tundra. Earthworms almost doubled the macroporosity in meadow soils and tripled macroporosity in heath. Interestingly, the fractal dimension of macropores decreased in response to earthworm burrowing in both systems, indicating that the presence of earthworms reduced the geometric complexity in comparison to other pore-generating processes active in the tundra. Observed effects on soil structure occurred along with a dramatically reduced soil moisture content, which was observed the first winter after earthworm introduction in the meadow. Our findings suggest that predictions of future changes in vegetation and soil carbon pools in the Arctic should include major impacts on soil properties that earthworms induce.},\n\tjournal = {Science of The Total Environment},\n\tauthor = {Klaminder, J. and Krab, E.J. and Larsbo, M. and Jonsson, H. and Fransson, J. and Koestel, J.},\n\tmonth = feb,\n\tyear = {2023},\n\tkeywords = {3D, Abisko, Bioturbation, Heath, Long-term, Meadow, Soil-mixing},\n\tpages = {160125},\n}\n\n\n\n
\n
\n\n\n
\n Human introductions have resulted in earthworms establishing in the Arctic, species known to cause cascading ecosystem change. However, few quantitative outdoor experiments have been performed that describe how these soil modifying earthworms are reshaping structures in tundra soils. In this study, we used three-dimensional (3-D) X-ray images of soil cores (approximately 10 cm diameter, 20 cm height, N = 48) to assess how earthworms (Aporrectodea sp. and Lumbricus sp.) affect soil structure and macropore networks in an outdoor mesocosm experiment that lasted four summers. Effects were assessed in both shrub-dominated (heath) and herb-dominated (meadow) tundra. Earthworms almost doubled the macroporosity in meadow soils and tripled macroporosity in heath. Interestingly, the fractal dimension of macropores decreased in response to earthworm burrowing in both systems, indicating that the presence of earthworms reduced the geometric complexity in comparison to other pore-generating processes active in the tundra. Observed effects on soil structure occurred along with a dramatically reduced soil moisture content, which was observed the first winter after earthworm introduction in the meadow. Our findings suggest that predictions of future changes in vegetation and soil carbon pools in the Arctic should include major impacts on soil properties that earthworms induce.\n
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\n  \n 2022\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Norway spruce postglacial recolonization of Fennoscandia.\n \n \n \n \n\n\n \n Nota, K.; Klaminder, J.; Milesi, P.; Bindler, R.; Nobile, A.; van Steijn, T.; Bertilsson, S.; Svensson, B.; Hirota, S. K.; Matsuo, A.; Gunnarsson, U.; Seppä, H.; Väliranta, M. M.; Wohlfarth, B.; Suyama, Y.; and Parducci, L.\n\n\n \n\n\n\n Nature Communications, 13(1): 1333. March 2022.\n Publisher: Nature Publishing Group\n\n\n\n
\n\n\n\n \n \n \"NorwayPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n\n\n\n
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@article{nota_norway_2022,\n\ttitle = {Norway spruce postglacial recolonization of {Fennoscandia}},\n\tvolume = {13},\n\tcopyright = {2022 The Author(s)},\n\tissn = {2041-1723},\n\turl = {https://www.nature.com/articles/s41467-022-28976-4},\n\tdoi = {10.1038/s41467-022-28976-4},\n\tabstract = {Contrasting theories exist regarding how Norway spruce (Picea abies) recolonized Fennoscandia after the last glaciation and both early Holocene establishments from western microrefugia and late Holocene colonization from the east have been postulated. Here, we show that Norway spruce was present in southern Fennoscandia as early as 14.7 ± 0.1 cal. kyr BP and that the millennia-old clonal spruce trees present today in central Sweden likely arrived with an early Holocene migration from the east. Our findings are based on ancient sedimentary DNA from multiple European sites (N = 15) combined with nuclear and mitochondrial DNA analysis of ancient clonal (N = 135) and contemporary spruce forest trees (N = 129) from central Sweden. Our other findings imply that Norway spruce was present shortly after deglaciation at the margins of the Scandinavian Ice Sheet, and support previously disputed finds of pollen in southern Sweden claiming spruce establishment during the Lateglacial.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2024-03-27},\n\tjournal = {Nature Communications},\n\tauthor = {Nota, Kevin and Klaminder, Jonatan and Milesi, Pascal and Bindler, Richard and Nobile, Alessandro and van Steijn, Tamara and Bertilsson, Stefan and Svensson, Brita and Hirota, Shun K. and Matsuo, Ayumi and Gunnarsson, Urban and Seppä, Heikki and Väliranta, Minna M. and Wohlfarth, Barbara and Suyama, Yoshihisa and Parducci, Laura},\n\tmonth = mar,\n\tyear = {2022},\n\tnote = {Publisher: Nature Publishing Group},\n\tkeywords = {Ecological genetics, Plant evolution},\n\tpages = {1333},\n}\n\n\n\n
\n
\n\n\n
\n Contrasting theories exist regarding how Norway spruce (Picea abies) recolonized Fennoscandia after the last glaciation and both early Holocene establishments from western microrefugia and late Holocene colonization from the east have been postulated. Here, we show that Norway spruce was present in southern Fennoscandia as early as 14.7 ± 0.1 cal. kyr BP and that the millennia-old clonal spruce trees present today in central Sweden likely arrived with an early Holocene migration from the east. Our findings are based on ancient sedimentary DNA from multiple European sites (N = 15) combined with nuclear and mitochondrial DNA analysis of ancient clonal (N = 135) and contemporary spruce forest trees (N = 129) from central Sweden. Our other findings imply that Norway spruce was present shortly after deglaciation at the margins of the Scandinavian Ice Sheet, and support previously disputed finds of pollen in southern Sweden claiming spruce establishment during the Lateglacial.\n
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\n \n\n \n \n \n \n \n \n Non-native species change the tune of tundra soils: Novel access to soundscapes of the Arctic earthworm invasion.\n \n \n \n \n\n\n \n Keen, S. C.; Wackett, A. A.; Willenbring, J. K.; Yoo, K.; Jonsson, H.; Clow, T.; and Klaminder, J.\n\n\n \n\n\n\n Science of The Total Environment, 838: 155976. September 2022.\n \n\n\n\n
\n\n\n\n \n \n \"Non-nativePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{keen_non-native_2022,\n\ttitle = {Non-native species change the tune of tundra soils: {Novel} access to soundscapes of the {Arctic} earthworm invasion},\n\tvolume = {838},\n\tissn = {0048-9697},\n\tshorttitle = {Non-native species change the tune of tundra soils},\n\turl = {https://www.sciencedirect.com/science/article/pii/S004896972203073X},\n\tdoi = {10.1016/j.scitotenv.2022.155976},\n\tabstract = {Over the last decade, an increasing number of studies have used soundscapes to address diverse ecological questions. Sound represents one of the few sources of information capable of providing in situ insights into processes occurring within opaque soil matrices. To date, the use of soundscapes for soil macrofauna monitoring has been experimentally tested only in controlled laboratory environments. Here we assess the validity of laboratory predictions and explore the use of soil soundscape proxies for monitoring soil macrofauna (i.e., earthworm) activities in an outdoor context. In a common garden experiment in northern Sweden, we constructed outdoor mesocosm plots (N = 36) containing two different Arctic vegetation types (meadow and heath) and introduced earthworms to half of these plots. Earthworms substantially altered the ambient soil soundscape under both vegetation types, as measured by both traditional soundscape indices and frequency band power levels, although their acoustic impacts were expressed differently in heath versus meadow soils. While these findings support the as-of-yet untapped promise of using belowground soundscape analyses to monitor soil ecosystem health, direct acoustic emissions from earthworm activities appear to be an unlikely proxy for tracking worm activities at daily timescales. Instead, earthworms indirectly altered the soil soundscape by ‘re-engineering’ the soil matrix: an effect that was dependent on vegetation type. Our findings suggest that long-term (i.e., seasonal) earthworm activities in natural soil settings can likely be monitored indirectly via their impacts on soundscape measures and acoustic indices. Analyzing soil soundscapes may enable larger-scale monitoring of high-latitude soils and is directly applicable to the specific case of earthworm invasions within Arctic soils, which has recently been identified as a potential threat to the resilience of high-latitude ecosystems. Soil soundscapes could also offer a novel means to monitor soils and soil-plant-faunal interactions in situ across diverse pedogenic, agronomic, and ecological systems.},\n\turldate = {2024-03-26},\n\tjournal = {Science of The Total Environment},\n\tauthor = {Keen, Sara C. and Wackett, Adrian A. and Willenbring, Jane K. and Yoo, Kyungsoo and Jonsson, Hanna and Clow, Travis and Klaminder, Jonatan},\n\tmonth = sep,\n\tyear = {2022},\n\tkeywords = {\\#nosource, Acoustic monitoring, Arctic, Earthworm invasion, Ecosystem disturbance, Ecosystem engineer, Soil fauna, Soil organic carbon, Soil structure, Soundscapes},\n\tpages = {155976},\n}\n\n\n\n
\n
\n\n\n
\n Over the last decade, an increasing number of studies have used soundscapes to address diverse ecological questions. Sound represents one of the few sources of information capable of providing in situ insights into processes occurring within opaque soil matrices. To date, the use of soundscapes for soil macrofauna monitoring has been experimentally tested only in controlled laboratory environments. Here we assess the validity of laboratory predictions and explore the use of soil soundscape proxies for monitoring soil macrofauna (i.e., earthworm) activities in an outdoor context. In a common garden experiment in northern Sweden, we constructed outdoor mesocosm plots (N = 36) containing two different Arctic vegetation types (meadow and heath) and introduced earthworms to half of these plots. Earthworms substantially altered the ambient soil soundscape under both vegetation types, as measured by both traditional soundscape indices and frequency band power levels, although their acoustic impacts were expressed differently in heath versus meadow soils. While these findings support the as-of-yet untapped promise of using belowground soundscape analyses to monitor soil ecosystem health, direct acoustic emissions from earthworm activities appear to be an unlikely proxy for tracking worm activities at daily timescales. Instead, earthworms indirectly altered the soil soundscape by ‘re-engineering’ the soil matrix: an effect that was dependent on vegetation type. Our findings suggest that long-term (i.e., seasonal) earthworm activities in natural soil settings can likely be monitored indirectly via their impacts on soundscape measures and acoustic indices. Analyzing soil soundscapes may enable larger-scale monitoring of high-latitude soils and is directly applicable to the specific case of earthworm invasions within Arctic soils, which has recently been identified as a potential threat to the resilience of high-latitude ecosystems. Soil soundscapes could also offer a novel means to monitor soils and soil-plant-faunal interactions in situ across diverse pedogenic, agronomic, and ecological systems.\n
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\n \n\n \n \n \n \n \n \n Sodium hypochlorite as an oxidizing agent for removal of soil organic matter before microplastics analyses.\n \n \n \n \n\n\n \n Bottone, A.; Boily, J.; Shchukarev, A.; Andersson, P. L.; and Klaminder, J.\n\n\n \n\n\n\n Journal of Environmental Quality, 51(1): 112–122. January 2022.\n Publisher: John Wiley & Sons, Ltd\n\n\n\n
\n\n\n\n \n \n \"SodiumPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{bottone_sodium_2022,\n\ttitle = {Sodium hypochlorite as an oxidizing agent for removal of soil organic matter before microplastics analyses},\n\tvolume = {51},\n\tissn = {0047-2425},\n\turl = {https://doi.org/10.1002/jeq2.20321},\n\tdoi = {10.1002/jeq2.20321},\n\tabstract = {Abstract The omnipresence of microplastics (MPs) across Earth's surface has raised concerns about their environmental impact and created an urgent need for methods to identify them in complex soil and sedimentary matrices. However, detecting MPs in the O horizons of soils is difficult because plastic polymers share many physical and chemical properties with natural soil organic matter (SOM). In this study, we assessed whether sodium hypochlorite (NaOCl), a reagent that can oxidize SOM and simultaneously preserve mineral constituents, can be used for MP analysis and characterization in soil environments. In addition, we scrutinized how factors such as MP size, polymer type, extraction methods, and soil matrix affect the recovery of microplastic particles. We used both hydrophobic and density-dependent separation methods to assess the effects of our oxidation treatment on the recovery of MP. We observed that NaOCl effectively removed SOM without greatly altering the surface properties of resistant MP polymers (polypropylene, polylactic acid, low-density polyethylene, and polyethylene terephthalate), which were characterized using scanning electron microscopy and Fourier-transform infrared spectroscopy after SOM removal. The NaOCl treatment caused some chlorination and formation of additional C?OH bonds on polymer surfaces, which likely contributed to the reduced efficiency of the hydrophobic-based (oil) extraction. We conclude that NaOCl treatment can improve detection of MPs in SOM-rich soil and that recovery of MPs from soils is influenced by MP size, polymer type, extraction method, and soil type, which makes it challenging to develop a universal analytical method.},\n\tnumber = {1},\n\turldate = {2023-07-22},\n\tjournal = {Journal of Environmental Quality},\n\tauthor = {Bottone, Anna and Boily, Jean-Francois and Shchukarev, Andrey and Andersson, Patrik L. and Klaminder, Jonatan},\n\tmonth = jan,\n\tyear = {2022},\n\tnote = {Publisher: John Wiley \\& Sons, Ltd},\n\tpages = {112--122},\n}\n\n\n\n
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\n Abstract The omnipresence of microplastics (MPs) across Earth's surface has raised concerns about their environmental impact and created an urgent need for methods to identify them in complex soil and sedimentary matrices. However, detecting MPs in the O horizons of soils is difficult because plastic polymers share many physical and chemical properties with natural soil organic matter (SOM). In this study, we assessed whether sodium hypochlorite (NaOCl), a reagent that can oxidize SOM and simultaneously preserve mineral constituents, can be used for MP analysis and characterization in soil environments. In addition, we scrutinized how factors such as MP size, polymer type, extraction methods, and soil matrix affect the recovery of microplastic particles. We used both hydrophobic and density-dependent separation methods to assess the effects of our oxidation treatment on the recovery of MP. We observed that NaOCl effectively removed SOM without greatly altering the surface properties of resistant MP polymers (polypropylene, polylactic acid, low-density polyethylene, and polyethylene terephthalate), which were characterized using scanning electron microscopy and Fourier-transform infrared spectroscopy after SOM removal. The NaOCl treatment caused some chlorination and formation of additional C?OH bonds on polymer surfaces, which likely contributed to the reduced efficiency of the hydrophobic-based (oil) extraction. We conclude that NaOCl treatment can improve detection of MPs in SOM-rich soil and that recovery of MPs from soils is influenced by MP size, polymer type, extraction method, and soil type, which makes it challenging to develop a universal analytical method.\n
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\n  \n 2021\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Anthropogenic forcing of fish boldness and its impacts on ecosystem structure.\n \n \n \n \n\n\n \n Wang, W.; Xu, N.; Zhang, L.; Andersen, K. H.; and Klaminder, J.\n\n\n \n\n\n\n Global Change Biology, 27(6): 1239–1249. 2021.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15473\n\n\n\n
\n\n\n\n \n \n \"AnthropogenicPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{wang_anthropogenic_2021,\n\ttitle = {Anthropogenic forcing of fish boldness and its impacts on ecosystem structure},\n\tvolume = {27},\n\tcopyright = {© 2020 John Wiley \\& Sons Ltd},\n\tissn = {1365-2486},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.15473},\n\tdoi = {10.1111/gcb.15473},\n\tabstract = {Modified fish behaviors in response to anthropogenic stressors, such as chemicals, microplastics, acoustic emissions and fisheries, are a debated driver of change in freshwater ecosystems and oceans. Our ability to judge the severity of observed behavioral responses is hampered by limited knowledge regarding how subtle behavior modifications in prey fish affect ecosystems. Here we show that anthropogenic stressors affecting fish boldness are not expected to cause population collapse, but rather elusive effects on fish length, population biomass, reproduction and ecosystem state shifts. We use a physiologically structured population model (three trophic levels), well fed with empirical data, to simulate how previously suggested alterations of fish boldness traits due to anthropogenic stressors affect ecosystem structure. Our results suggest that these stressors may cause ecosystem structure effects, such as skewed size distributions, reduced fish biomass and reduced reproduction success, by altering the foraging behavior of fish. However, the specific structure effects depend on where the boldness–shyness continuum change occurs and on the species-specific life stages. The model also highlights somewhat counterintuitive effects leading to possible extinction of predators when the foraging behavior of the prey is hampered. We conclude that anthropogenic forcing of fish behavior may be a hidden mechanism behind ecosystem structure changes in both freshwater and marine ecosystems.},\n\tlanguage = {en},\n\tnumber = {6},\n\turldate = {2024-03-27},\n\tjournal = {Global Change Biology},\n\tauthor = {Wang, Wei and Xu, Nuo and Zhang, Lai and Andersen, Ken H. and Klaminder, Jonatan},\n\tyear = {2021},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15473},\n\tkeywords = {\\#nosource, aquatic ecosystem, behavioral trait, boldness alteration, life history, regime shift, size-structured population model},\n\tpages = {1239--1249},\n}\n\n\n\n
\n
\n\n\n
\n Modified fish behaviors in response to anthropogenic stressors, such as chemicals, microplastics, acoustic emissions and fisheries, are a debated driver of change in freshwater ecosystems and oceans. Our ability to judge the severity of observed behavioral responses is hampered by limited knowledge regarding how subtle behavior modifications in prey fish affect ecosystems. Here we show that anthropogenic stressors affecting fish boldness are not expected to cause population collapse, but rather elusive effects on fish length, population biomass, reproduction and ecosystem state shifts. We use a physiologically structured population model (three trophic levels), well fed with empirical data, to simulate how previously suggested alterations of fish boldness traits due to anthropogenic stressors affect ecosystem structure. Our results suggest that these stressors may cause ecosystem structure effects, such as skewed size distributions, reduced fish biomass and reduced reproduction success, by altering the foraging behavior of fish. However, the specific structure effects depend on where the boldness–shyness continuum change occurs and on the species-specific life stages. The model also highlights somewhat counterintuitive effects leading to possible extinction of predators when the foraging behavior of the prey is hampered. We conclude that anthropogenic forcing of fish behavior may be a hidden mechanism behind ecosystem structure changes in both freshwater and marine ecosystems.\n
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\n \n\n \n \n \n \n \n \n The missing pieces for better future predictions in subarctic ecosystems: A Torneträsk case study.\n \n \n \n \n\n\n \n Pascual, D.; Åkerman, J.; Becher, M.; Callaghan, T. V.; Christensen, T. R.; Dorrepaal, E.; Emanuelsson, U.; Giesler, R.; Hammarlund, D.; Hanna, E.; Hofgaard, A.; Jin, H.; Johansson, C.; Jonasson, C.; Klaminder, J.; Karlsson, J.; Lundin, E.; Michelsen, A.; Olefeldt, D.; Persson, A.; Phoenix, G. K.; Rączkowska, Z.; Rinnan, R.; Ström, L.; Tang, J.; Varner, R. K.; Wookey, P.; and Johansson, M.\n\n\n \n\n\n\n Ambio, 50(2): 375–392. February 2021.\n \n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{pascual_missing_2021,\n\ttitle = {The missing pieces for better future predictions in subarctic ecosystems: {A} {Torneträsk} case study},\n\tvolume = {50},\n\tissn = {1654-7209},\n\turl = {https://doi.org/10.1007/s13280-020-01381-1},\n\tdoi = {10.1007/s13280-020-01381-1},\n\tabstract = {Arctic and subarctic ecosystems are experiencing substantial changes in hydrology, vegetation, permafrost conditions, and carbon cycling, in response to climatic change and other anthropogenic drivers, and these changes are likely to continue over this century. The total magnitude of these changes results from multiple interactions among these drivers. Field measurements can address the overall responses to different changing drivers, but are less capable of quantifying the interactions among them. Currently, a comprehensive assessment of the drivers of ecosystem changes, and the magnitude of their direct and indirect impacts on subarctic ecosystems, is missing. The Torneträsk area, in the Swedish subarctic, has an unrivalled history of environmental observation over 100 years, and is one of the most studied sites in the Arctic. In this study, we summarize and rank the drivers of ecosystem change in the Torneträsk area, and propose research priorities identified, by expert assessment, to improve predictions of ecosystem changes. The research priorities identified include understanding impacts on ecosystems brought on by altered frequency and intensity of winter warming events, evapotranspiration rates, rainfall, duration of snow cover and lake-ice, changed soil moisture, and droughts. This case study can help us understand the ongoing ecosystem changes occurring in the Torneträsk area, and contribute to improve predictions of future ecosystem changes at a larger scale. This understanding will provide the basis for the future mitigation and adaptation plans needed in a changing climate.},\n\tnumber = {2},\n\tjournal = {Ambio},\n\tauthor = {Pascual, Didac and Åkerman, Jonas and Becher, Marina and Callaghan, Terry V. and Christensen, Torben R. and Dorrepaal, Ellen and Emanuelsson, Urban and Giesler, Reiner and Hammarlund, Dan and Hanna, Edward and Hofgaard, Annika and Jin, Hongxiao and Johansson, Cecilia and Jonasson, Christer and Klaminder, Jonatan and Karlsson, Jan and Lundin, Erik and Michelsen, Anders and Olefeldt, David and Persson, Andreas and Phoenix, Gareth K. and Rączkowska, Zofia and Rinnan, Riikka and Ström, Lena and Tang, Jing and Varner, Ruth K. and Wookey, Philip and Johansson, Margareta},\n\tmonth = feb,\n\tyear = {2021},\n\tkeywords = {\\#nosource},\n\tpages = {375--392},\n}\n\n\n\n
\n
\n\n\n
\n Arctic and subarctic ecosystems are experiencing substantial changes in hydrology, vegetation, permafrost conditions, and carbon cycling, in response to climatic change and other anthropogenic drivers, and these changes are likely to continue over this century. The total magnitude of these changes results from multiple interactions among these drivers. Field measurements can address the overall responses to different changing drivers, but are less capable of quantifying the interactions among them. Currently, a comprehensive assessment of the drivers of ecosystem changes, and the magnitude of their direct and indirect impacts on subarctic ecosystems, is missing. The Torneträsk area, in the Swedish subarctic, has an unrivalled history of environmental observation over 100 years, and is one of the most studied sites in the Arctic. In this study, we summarize and rank the drivers of ecosystem change in the Torneträsk area, and propose research priorities identified, by expert assessment, to improve predictions of ecosystem changes. The research priorities identified include understanding impacts on ecosystems brought on by altered frequency and intensity of winter warming events, evapotranspiration rates, rainfall, duration of snow cover and lake-ice, changed soil moisture, and droughts. This case study can help us understand the ongoing ecosystem changes occurring in the Torneträsk area, and contribute to improve predictions of future ecosystem changes at a larger scale. This understanding will provide the basis for the future mitigation and adaptation plans needed in a changing climate.\n
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\n  \n 2020\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Decade of experimental permafrost thaw reduces turnover of young carbon and increases losses of old carbon, without affecting the net carbon balance.\n \n \n \n \n\n\n \n Olid, C.; Klaminder, J.; Monteux, S.; Johansson, M.; and Dorrepaal, E.\n\n\n \n\n\n\n Global Change Biology, 26(10): 5886–5898. 2020.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15283\n\n\n\n
\n\n\n\n \n \n \"DecadePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{olid_decade_2020,\n\ttitle = {Decade of experimental permafrost thaw reduces turnover of young carbon and increases losses of old carbon, without affecting the net carbon balance},\n\tvolume = {26},\n\tcopyright = {© 2020 The Authors. Global Change Biology published by John Wiley \\& Sons Ltd},\n\tissn = {1365-2486},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.15283},\n\tdoi = {10.1111/gcb.15283},\n\tabstract = {Thicker snowpacks and their insulation effects cause winter-warming and invoke thaw of permafrost ecosystems. Temperature-dependent decomposition of previously frozen carbon (C) is currently considered one of the strongest feedbacks between the Arctic and the climate system, but the direction and magnitude of the net C balance remains uncertain. This is because winter effects are rarely integrated with C fluxes during the snow-free season and because predicting the net C balance from both surface processes and thawing deep layers remains challenging. In this study, we quantified changes in the long-term net C balance (net ecosystem production) in a subarctic peat plateau subjected to 10 years of experimental winter-warming. By combining 210Pb and 14Cdating of peat cores with peat growth models, we investigated thawing effects on year-round primary production and C losses through respiration and leaching from both shallow and deep peat layers. Winter-warming and permafrost thaw had no effect on the net C balance, but strongly affected gross C fluxes. Carbon losses through decomposition from the upper peat were reduced as thawing of permafrost induced surface subsidence and subsequent waterlogging. However, primary production was also reduced likely due to a strong decline in bryophytes cover while losses from the old C pool almost tripled, caused by the deepened active layer. Our findings highlight the need to estimate long-term responses of whole-year production and decomposition processes to thawing, both in shallow and deep soil layers, as they may contrast and lead to unexpected net effects on permafrost C storage.},\n\tlanguage = {en},\n\tnumber = {10},\n\turldate = {2024-03-27},\n\tjournal = {Global Change Biology},\n\tauthor = {Olid, Carolina and Klaminder, Jonatan and Monteux, Sylvain and Johansson, Margareta and Dorrepaal, Ellen},\n\tyear = {2020},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15283},\n\tkeywords = {\\#nosource, age–depth modelling, carbon accumulation, carbon cycle, climate change, decomposition, peat dating, permafrost thawing, production, snow addition, winter-warming},\n\tpages = {5886--5898},\n}\n\n\n\n
\n
\n\n\n
\n Thicker snowpacks and their insulation effects cause winter-warming and invoke thaw of permafrost ecosystems. Temperature-dependent decomposition of previously frozen carbon (C) is currently considered one of the strongest feedbacks between the Arctic and the climate system, but the direction and magnitude of the net C balance remains uncertain. This is because winter effects are rarely integrated with C fluxes during the snow-free season and because predicting the net C balance from both surface processes and thawing deep layers remains challenging. In this study, we quantified changes in the long-term net C balance (net ecosystem production) in a subarctic peat plateau subjected to 10 years of experimental winter-warming. By combining 210Pb and 14Cdating of peat cores with peat growth models, we investigated thawing effects on year-round primary production and C losses through respiration and leaching from both shallow and deep peat layers. Winter-warming and permafrost thaw had no effect on the net C balance, but strongly affected gross C fluxes. Carbon losses through decomposition from the upper peat were reduced as thawing of permafrost induced surface subsidence and subsequent waterlogging. However, primary production was also reduced likely due to a strong decline in bryophytes cover while losses from the old C pool almost tripled, caused by the deepened active layer. Our findings highlight the need to estimate long-term responses of whole-year production and decomposition processes to thawing, both in shallow and deep soil layers, as they may contrast and lead to unexpected net effects on permafrost C storage.\n
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\n \n\n \n \n \n \n \n \n The old and the new: evaluating performance of acoustic telemetry systems in tracking migrating Atlantic salmon (Salmo salar) smolt and European eel (Anguilla anguilla) around hydropower facilities.\n \n \n \n \n\n\n \n Leander, J.; Klaminder, J.; Jonsson, M.; Brodin, T.; Leonardsson, K.; and Hellström, G.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences, 77(1): 177–187. January 2020.\n Publisher: NRC Research Press\n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{leander_old_2020,\n\ttitle = {The old and the new: evaluating performance of acoustic telemetry systems in tracking migrating {Atlantic} salmon ({Salmo} salar) smolt and {European} eel ({Anguilla} anguilla) around hydropower facilities},\n\tvolume = {77},\n\tissn = {0706-652X},\n\tshorttitle = {The old and the new},\n\turl = {https://cdnsciencepub.com/doi/abs/10.1139/cjfas-2019-0058},\n\tdoi = {10.1139/cjfas-2019-0058},\n\tabstract = {Acoustic telemetry represents the state-of-the-art technology for monitoring behaviour of aquatic organisms in the wild. Yet, the performance of different systems is rarely evaluated across species and environments. In this study, we evaluate two different acoustic telemetry systems, a commonly used analogue pulse-position-modulation-based system (VEMCO PPM) and a newly developed high-residency digital binary phase shift key-based system (VEMCO HR2), in ability to track downstream migrating Atlantic salmon smolt (Salmo salar) and European eel (Anguilla anguilla) around hydropower facilities. High-precision GPS were used to evaluate precision and accuracy of hyperbolically positioned data derived from each system. The PPM-based system had higher detection range than HR2 and generated more positions per transmission for eels migrating close to bottom than for surface-oriented salmon smolts. HR2 generated tenfold more positions per time unit than PPM, were less sensitive to noise, achieved submetre positional precision, and were considerably more accurate than PPM-derived positions after filtering. HR2 was deemed more capable than PPM in fine-scale positioning at moderate distances at hydropower facilities.},\n\tnumber = {1},\n\turldate = {2024-03-26},\n\tjournal = {Canadian Journal of Fisheries and Aquatic Sciences},\n\tauthor = {Leander, Johan and Klaminder, Jonatan and Jonsson, Micael and Brodin, Tomas and Leonardsson, Kjell and Hellström, Gustav},\n\tmonth = jan,\n\tyear = {2020},\n\tnote = {Publisher: NRC Research Press},\n\tkeywords = {\\#nosource},\n\tpages = {177--187},\n}\n\n\n\n
\n
\n\n\n
\n Acoustic telemetry represents the state-of-the-art technology for monitoring behaviour of aquatic organisms in the wild. Yet, the performance of different systems is rarely evaluated across species and environments. In this study, we evaluate two different acoustic telemetry systems, a commonly used analogue pulse-position-modulation-based system (VEMCO PPM) and a newly developed high-residency digital binary phase shift key-based system (VEMCO HR2), in ability to track downstream migrating Atlantic salmon smolt (Salmo salar) and European eel (Anguilla anguilla) around hydropower facilities. High-precision GPS were used to evaluate precision and accuracy of hyperbolically positioned data derived from each system. The PPM-based system had higher detection range than HR2 and generated more positions per transmission for eels migrating close to bottom than for surface-oriented salmon smolts. HR2 generated tenfold more positions per time unit than PPM, were less sensitive to noise, achieved submetre positional precision, and were considerably more accurate than PPM-derived positions after filtering. HR2 was deemed more capable than PPM in fine-scale positioning at moderate distances at hydropower facilities.\n
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\n \n\n \n \n \n \n \n \n Invasive earthworms unlock arctic plant nitrogen limitation.\n \n \n \n \n\n\n \n Blume-Werry, G.; Krab, E. J.; Olofsson, J.; Sundqvist, M. K.; Väisänen, M.; and Klaminder, J.\n\n\n \n\n\n\n Nature Communications, 11(1): 1–10. April 2020.\n Number: 1 Publisher: Nature Publishing Group\n\n\n\n
\n\n\n\n \n \n \"InvasivePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{blume-werry_invasive_2020,\n\ttitle = {Invasive earthworms unlock arctic plant nitrogen limitation},\n\tvolume = {11},\n\tcopyright = {2020 The Author(s)},\n\tissn = {2041-1723},\n\turl = {https://www.nature.com/articles/s41467-020-15568-3},\n\tdoi = {10.1038/s41467-020-15568-3},\n\tabstract = {Arctic plant growth is predominantly nitrogen limited, where the slow nitrogen turnover in the soil is commonly attributed to the cold arctic climate. Here the authors show that the arctic plant-soil nitrogen cycling is also constrained by the lack of larger detritivores like earthworms.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2020-04-23},\n\tjournal = {Nature Communications},\n\tauthor = {Blume-Werry, Gesche and Krab, Eveline J. and Olofsson, Johan and Sundqvist, Maja K. and Väisänen, Maria and Klaminder, Jonatan},\n\tmonth = apr,\n\tyear = {2020},\n\tnote = {Number: 1\nPublisher: Nature Publishing Group},\n\tkeywords = {\\#nosource},\n\tpages = {1--10},\n}\n\n\n\n\n\n\n\n
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\n Arctic plant growth is predominantly nitrogen limited, where the slow nitrogen turnover in the soil is commonly attributed to the cold arctic climate. Here the authors show that the arctic plant-soil nitrogen cycling is also constrained by the lack of larger detritivores like earthworms.\n
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\n  \n 2019\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Global distribution of earthworm diversity.\n \n \n \n \n\n\n \n Phillips, H. R. P.; Guerra, C. A.; Bartz, M. L. C.; Briones, M. J. I.; Brown, G.; Crowther, T. W.; Ferlian, O.; Gongalsky, K. B.; van den Hoogen, J.; Krebs, J.; Orgiazzi, A.; Routh, D.; Schwarz, B.; Bach, E. M.; Bennett, J.; Brose, U.; Decaëns, T.; König-Ries, B.; Loreau, M.; Mathieu, J.; Mulder, C.; van der Putten, W. H.; Ramirez, K. S.; Rillig, M. C.; Russell, D.; Rutgers, M.; Thakur, M. P.; de Vries, F. T.; Wall, D. H.; Wardle, D. A.; Arai, M.; Ayuke, F. O.; Baker, G. H.; Beauséjour, R.; Bedano, J. C.; Birkhofer, K.; Blanchart, E.; Blossey, B.; Bolger, T.; Bradley, R. L.; Callaham, M. A.; Capowiez, Y.; Caulfield, M. E.; Choi, A.; Crotty, F. V.; Dávalos, A.; Cosin, D. J. D.; Dominguez, A.; Duhour, A. E.; van Eekeren, N.; Emmerling, C.; Falco, L. B.; Fernández, R.; Fonte, S. J.; Fragoso, C.; Franco, A. L. C.; Fugère, M.; Fusilero, A. T.; Gholami, S.; Gundale, M. J.; López, M. G.; Hackenberger, D. K.; Hernández, L. M.; Hishi, T.; Holdsworth, A. R.; Holmstrup, M.; Hopfensperger, K. N.; Lwanga, E. H.; Huhta, V.; Hurisso, T. T.; Iannone, B. V.; Iordache, M.; Joschko, M.; Kaneko, N.; Kanianska, R.; Keith, A. M.; Kelly, C. A.; Kernecker, M. L.; Klaminder, J.; Koné, A. W.; Kooch, Y.; Kukkonen, S. T.; Lalthanzara, H.; Lammel, D. R.; Lebedev, I. M.; Li, Y.; Lidon, J. B. J.; Lincoln, N. K.; Loss, S. R.; Marichal, R.; Matula, R.; Moos, J. H.; Moreno, G.; Morón-Ríos, A.; Muys, B.; Neirynck, J.; Norgrove, L.; Novo, M.; Nuutinen, V.; Nuzzo, V.; Rahman P, M.; Pansu, J.; Paudel, S.; Pérès, G.; Pérez-Camacho, L.; Piñeiro, R.; Ponge, J.; Rashid, M. I.; Rebollo, S.; Rodeiro-Iglesias, J.; Rodríguez, M. Á.; Roth, A. M.; Rousseau, G. X.; Rozen, A.; Sayad, E.; van Schaik, L.; Scharenbroch, B. C.; Schirrmann, M.; Schmidt, O.; Schröder, B.; Seeber, J.; Shashkov, M. P.; Singh, J.; Smith, S. M.; Steinwandter, M.; Talavera, J. A.; Trigo, D.; Tsukamoto, J.; de Valença, A. W.; Vanek, S. J.; Virto, I.; Wackett, A. A.; Warren, M. W.; Wehr, N. H.; Whalen, J. K.; Wironen, M. B.; Wolters, V.; Zenkova, I. V.; Zhang, W.; Cameron, E. K.; and Eisenhauer, N.\n\n\n \n\n\n\n Science, 366(6464): 480–485. October 2019.\n \n\n\n\n
\n\n\n\n \n \n \"GlobalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{phillips_global_2019,\n\ttitle = {Global distribution of earthworm diversity},\n\tvolume = {366},\n\tissn = {0036-8075, 1095-9203},\n\turl = {https://www.sciencemag.org/lookup/doi/10.1126/science.aax4851},\n\tdoi = {10.1126/science.aax4851},\n\tlanguage = {en},\n\tnumber = {6464},\n\turldate = {2020-03-19},\n\tjournal = {Science},\n\tauthor = {Phillips, Helen R. P. and Guerra, Carlos A. and Bartz, Marie L. C. and Briones, Maria J. I. and Brown, George and Crowther, Thomas W. and Ferlian, Olga and Gongalsky, Konstantin B. and van den Hoogen, Johan and Krebs, Julia and Orgiazzi, Alberto and Routh, Devin and Schwarz, Benjamin and Bach, Elizabeth M. and Bennett, Joanne and Brose, Ulrich and Decaëns, Thibaud and König-Ries, Birgitta and Loreau, Michel and Mathieu, Jérôme and Mulder, Christian and van der Putten, Wim H. and Ramirez, Kelly S. and Rillig, Matthias C. and Russell, David and Rutgers, Michiel and Thakur, Madhav P. and de Vries, Franciska T. and Wall, Diana H. and Wardle, David A. and Arai, Miwa and Ayuke, Fredrick O. and Baker, Geoff H. and Beauséjour, Robin and Bedano, José C. and Birkhofer, Klaus and Blanchart, Eric and Blossey, Bernd and Bolger, Thomas and Bradley, Robert L. and Callaham, Mac A. and Capowiez, Yvan and Caulfield, Mark E. and Choi, Amy and Crotty, Felicity V. and Dávalos, Andrea and Cosin, Darío J. Diaz and Dominguez, Anahí and Duhour, Andrés Esteban and van Eekeren, Nick and Emmerling, Christoph and Falco, Liliana B. and Fernández, Rosa and Fonte, Steven J. and Fragoso, Carlos and Franco, André L. C. and Fugère, Martine and Fusilero, Abegail T. and Gholami, Shaieste and Gundale, Michael J. and López, Mónica Gutiérrez and Hackenberger, Davorka K. and Hernández, Luis M. and Hishi, Takuo and Holdsworth, Andrew R. and Holmstrup, Martin and Hopfensperger, Kristine N. and Lwanga, Esperanza Huerta and Huhta, Veikko and Hurisso, Tunsisa T. and Iannone, Basil V. and Iordache, Madalina and Joschko, Monika and Kaneko, Nobuhiro and Kanianska, Radoslava and Keith, Aidan M. and Kelly, Courtland A. and Kernecker, Maria L. and Klaminder, Jonatan and Koné, Armand W. and Kooch, Yahya and Kukkonen, Sanna T. and Lalthanzara, H. and Lammel, Daniel R. and Lebedev, Iurii M. and Li, Yiqing and Lidon, Juan B. Jesus and Lincoln, Noa K. and Loss, Scott R. and Marichal, Raphael and Matula, Radim and Moos, Jan Hendrik and Moreno, Gerardo and Morón-Ríos, Alejandro and Muys, Bart and Neirynck, Johan and Norgrove, Lindsey and Novo, Marta and Nuutinen, Visa and Nuzzo, Victoria and Rahman P, Mujeeb and Pansu, Johan and Paudel, Shishir and Pérès, Guénola and Pérez-Camacho, Lorenzo and Piñeiro, Raúl and Ponge, Jean-François and Rashid, Muhammad Imtiaz and Rebollo, Salvador and Rodeiro-Iglesias, Javier and Rodríguez, Miguel Á. and Roth, Alexander M. and Rousseau, Guillaume X. and Rozen, Anna and Sayad, Ehsan and van Schaik, Loes and Scharenbroch, Bryant C. and Schirrmann, Michael and Schmidt, Olaf and Schröder, Boris and Seeber, Julia and Shashkov, Maxim P. and Singh, Jaswinder and Smith, Sandy M. and Steinwandter, Michael and Talavera, José A. and Trigo, Dolores and Tsukamoto, Jiro and de Valença, Anne W. and Vanek, Steven J. and Virto, Iñigo and Wackett, Adrian A. and Warren, Matthew W. and Wehr, Nathaniel H. and Whalen, Joann K. and Wironen, Michael B. and Wolters, Volkmar and Zenkova, Irina V. and Zhang, Weixin and Cameron, Erin K. and Eisenhauer, Nico},\n\tmonth = oct,\n\tyear = {2019},\n\tkeywords = {\\#nosource},\n\tpages = {480--485},\n}\n\n\n\n
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\n \n\n \n \n \n \n \n \n Investigating tissue bioconcentration and the behavioural effects of two pharmaceutical pollutants on sea trout (Salmo trutta) in the laboratory and field.\n \n \n \n \n\n\n \n McCallum, E. S.; Sundelin, A.; Fick, J.; Alanärä, A.; Klaminder, J.; Hellström, G.; and Brodin, T.\n\n\n \n\n\n\n Aquatic Toxicology, 207: 170–178. February 2019.\n \n\n\n\n
\n\n\n\n \n \n \"InvestigatingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{mccallum_investigating_2019,\n\ttitle = {Investigating tissue bioconcentration and the behavioural effects of two pharmaceutical pollutants on sea trout ({Salmo} trutta) in the laboratory and field},\n\tvolume = {207},\n\tissn = {0166-445X},\n\turl = {http://www.sciencedirect.com/science/article/pii/S0166445X18307173},\n\tdoi = {10.1016/j.aquatox.2018.11.028},\n\tabstract = {Pharmaceuticals entering aquatic ecosystems via wastewater effluents are of increasing concern for wild animals. Because some pharmaceuticals are designed to modulate human behaviour, measuring the impacts of exposure to pharmaceuticals on fish behaviour has become a valuable endpoint. While laboratory studies have shown that pharmaceuticals can affect fish behaviour, there is a lack of understanding if behaviour is similarly affected in natural environments. Here, we exposed sea trout (Salmo trutta) smolts to two concentrations of two pharmaceutical pollutants often detected in surface waters: temazepam (a benzodiazepine, anxiolytic) or irbesartan (an angiotensin II receptor blocker, anti-hypertensive). We tested the hypothesis that changes to behavioural traits (anxiety and activity) measured in laboratory trials following exposure are predictive of behaviour in the natural environment (downstream migration). Measures of anxiety and activity in the laboratory assay did not vary with temazepam treatment, but temazepam-exposed fish began migrating faster in the field. Activity in the laboratory assay did predict overall migration speed in the field. In contrast to temazepam, we found that irbesartan exposure did not affect behaviour in the laboratory, field, or the relationship between the two endpoints. However, irbesartan was also not readily taken up into fish tissue (i.e. below detection levels in the muscle tissue), while temazepam bioconcentrated (bioconcentration factor 7.68) rapidly (t1/2 {\\textless} 24 h). Our findings add to a growing literature showing that benzodiazepine pollutants can modulate fish behaviour and that laboratory assays may be less sensitive at detecting the effects of pollutants compared to measuring effects in natural settings. Therefore, we underscore the importance of measuring behavioural effects in the natural environment.},\n\turldate = {2019-02-21},\n\tjournal = {Aquatic Toxicology},\n\tauthor = {McCallum, Erin S. and Sundelin, Anna and Fick, Jerker and Alanärä, Anders and Klaminder, Jonatan and Hellström, Gustav and Brodin, Tomas},\n\tmonth = feb,\n\tyear = {2019},\n\tkeywords = {\\#nosource, Bioconcentration, Ecotoxicology, In situ, Scototaxis, Steady-state},\n\tpages = {170--178},\n}\n\n\n\n
\n
\n\n\n
\n Pharmaceuticals entering aquatic ecosystems via wastewater effluents are of increasing concern for wild animals. Because some pharmaceuticals are designed to modulate human behaviour, measuring the impacts of exposure to pharmaceuticals on fish behaviour has become a valuable endpoint. While laboratory studies have shown that pharmaceuticals can affect fish behaviour, there is a lack of understanding if behaviour is similarly affected in natural environments. Here, we exposed sea trout (Salmo trutta) smolts to two concentrations of two pharmaceutical pollutants often detected in surface waters: temazepam (a benzodiazepine, anxiolytic) or irbesartan (an angiotensin II receptor blocker, anti-hypertensive). We tested the hypothesis that changes to behavioural traits (anxiety and activity) measured in laboratory trials following exposure are predictive of behaviour in the natural environment (downstream migration). Measures of anxiety and activity in the laboratory assay did not vary with temazepam treatment, but temazepam-exposed fish began migrating faster in the field. Activity in the laboratory assay did predict overall migration speed in the field. In contrast to temazepam, we found that irbesartan exposure did not affect behaviour in the laboratory, field, or the relationship between the two endpoints. However, irbesartan was also not readily taken up into fish tissue (i.e. below detection levels in the muscle tissue), while temazepam bioconcentrated (bioconcentration factor 7.68) rapidly (t1/2 \\textless 24 h). Our findings add to a growing literature showing that benzodiazepine pollutants can modulate fish behaviour and that laboratory assays may be less sensitive at detecting the effects of pollutants compared to measuring effects in natural settings. Therefore, we underscore the importance of measuring behavioural effects in the natural environment.\n
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\n  \n 2018\n \n \n (5)\n \n \n
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\n \n\n \n \n \n \n \n \n Human-mediated introduction of geoengineering earthworms in the Fennoscandian arctic.\n \n \n \n \n\n\n \n Wackett, A. A.; Yoo, K.; Olofsson, J.; and Klaminder, J.\n\n\n \n\n\n\n Biological Invasions, 20(6): 1377–1386. June 2018.\n \n\n\n\n
\n\n\n\n \n \n \"Human-mediatedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{wackett_human-mediated_2018,\n\ttitle = {Human-mediated introduction of geoengineering earthworms in the {Fennoscandian} arctic},\n\tvolume = {20},\n\tissn = {1573-1464},\n\turl = {https://doi.org/10.1007/s10530-017-1642-7},\n\tdoi = {10.1007/s10530-017-1642-7},\n\tabstract = {It is now well established that European earthworms are re-shaping formerly glaciated forests in North America with dramatic ecological consequences. However, few have considered the potential invasiveness of this species assemblage in the European arctic. Here we argue that some earthworm species (Lumbricus rubellus, Lumbricus terrestris and Aporrectodea sp.) with great geomorphological impact (geoengineering species) are non-native and invasive in the Fennoscandian arctic birch forests, where they have been introduced by agrarian settlers and most recently through recreational fishing and gardening. Our exploratory surveys indicate no obvious historical dispersal mechanism that can explain early arrival of these earthworms into the Fennoscandian arctic: that is, these species do not appear to establish naturally along coastlines mimicking conditions following deglaciation in Fennoscandia, nor were they spread by early native (Sami) cultures. The importance of anthropogenic sources and the invasive characteristics of L. rubellus and Aporrectodea sp. in the arctic is evident from their radiation outwards from abandoned farms and modern cabin lawns into adjacent arctic birch forests. They appear to outcompete previously established litter-dwelling earthworm species (i.e. Dendrobaena octaedra) that likely colonized the Fennoscandian landscape rapidly following deglaciation via hydrochory and/or dispersal by early Sami settlements. The high geoengineering earthworm biomasses, their recognized ecological impact in other formerly glaciated environments, and their persistence once established leads us to suggest that geoengineering earthworms may pose a potent threat to some of the most remote and protected arctic environments in northern Europe.},\n\tlanguage = {en},\n\tnumber = {6},\n\turldate = {2024-03-27},\n\tjournal = {Biological Invasions},\n\tauthor = {Wackett, Adrian A. and Yoo, Kyungsoo and Olofsson, Johan and Klaminder, Jonatan},\n\tmonth = jun,\n\tyear = {2018},\n\tkeywords = {\\#nosource, Arctic, Earthworm invasion, Hydrochory, Land use, Lumbricidae},\n\tpages = {1377--1386},\n}\n\n\n\n
\n
\n\n\n
\n It is now well established that European earthworms are re-shaping formerly glaciated forests in North America with dramatic ecological consequences. However, few have considered the potential invasiveness of this species assemblage in the European arctic. Here we argue that some earthworm species (Lumbricus rubellus, Lumbricus terrestris and Aporrectodea sp.) with great geomorphological impact (geoengineering species) are non-native and invasive in the Fennoscandian arctic birch forests, where they have been introduced by agrarian settlers and most recently through recreational fishing and gardening. Our exploratory surveys indicate no obvious historical dispersal mechanism that can explain early arrival of these earthworms into the Fennoscandian arctic: that is, these species do not appear to establish naturally along coastlines mimicking conditions following deglaciation in Fennoscandia, nor were they spread by early native (Sami) cultures. The importance of anthropogenic sources and the invasive characteristics of L. rubellus and Aporrectodea sp. in the arctic is evident from their radiation outwards from abandoned farms and modern cabin lawns into adjacent arctic birch forests. They appear to outcompete previously established litter-dwelling earthworm species (i.e. Dendrobaena octaedra) that likely colonized the Fennoscandian landscape rapidly following deglaciation via hydrochory and/or dispersal by early Sami settlements. The high geoengineering earthworm biomasses, their recognized ecological impact in other formerly glaciated environments, and their persistence once established leads us to suggest that geoengineering earthworms may pose a potent threat to some of the most remote and protected arctic environments in northern Europe.\n
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\n \n\n \n \n \n \n \n \n Decreased cryogenic disturbance: one of the potential mechanisms behind the vegetation change in the Arctic.\n \n \n \n \n\n\n \n Becher, M.; Olofsson, J.; Berglund, L.; and Klaminder, J.\n\n\n \n\n\n\n Polar Biology, 41(1): 101–110. January 2018.\n \n\n\n\n
\n\n\n\n \n \n \"DecreasedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{becher_decreased_2018,\n\ttitle = {Decreased cryogenic disturbance: one of the potential mechanisms behind the vegetation change in the {Arctic}},\n\tvolume = {41},\n\tissn = {1432-2056},\n\tshorttitle = {Decreased cryogenic disturbance},\n\turl = {https://doi.org/10.1007/s00300-017-2173-5},\n\tdoi = {10.1007/s00300-017-2173-5},\n\tabstract = {During the last few decades, the Arctic has experienced large-scale vegetation changes. Understanding the mechanisms behind this vegetation change is crucial for our ability to predict future changes. This study tested the hypothesis that decreased cryogenic disturbances cause vegetation change in patterned ground study fields (non-sorted circles) in Abisko, Sweden during the last few decades. The hypothesis was tested by surveying the composition of plant communities across a gradient in cryogenic disturbance and by reinvestigating plant communities previously surveyed in the 1980s to scrutinise how these communities changed in response to reduced cryogenic disturbance. Whereas the historical changes in species occurrence associated with decreased cryogenic disturbances were relatively consistent with the changes along the contemporary gradient of cryogenic disturbances, the species abundance revealed important transient changes highly dependent on the initial plant community composition. Our results suggest that altered cryogenic disturbances cause temporal changes in vegetation dynamics, but the net effects on vegetation communities depend on the composition of initial plant species.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2024-03-27},\n\tjournal = {Polar Biology},\n\tauthor = {Becher, M. and Olofsson, J. and Berglund, L. and Klaminder, J.},\n\tmonth = jan,\n\tyear = {2018},\n\tkeywords = {\\#nosource, Cryogenic disturbance, Differential heave, Freeze/thaw-indices, Non-sorted circles, Patterned ground, Plant abundance},\n\tpages = {101--110},\n}\n\n\n\n
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\n During the last few decades, the Arctic has experienced large-scale vegetation changes. Understanding the mechanisms behind this vegetation change is crucial for our ability to predict future changes. This study tested the hypothesis that decreased cryogenic disturbances cause vegetation change in patterned ground study fields (non-sorted circles) in Abisko, Sweden during the last few decades. The hypothesis was tested by surveying the composition of plant communities across a gradient in cryogenic disturbance and by reinvestigating plant communities previously surveyed in the 1980s to scrutinise how these communities changed in response to reduced cryogenic disturbance. Whereas the historical changes in species occurrence associated with decreased cryogenic disturbances were relatively consistent with the changes along the contemporary gradient of cryogenic disturbances, the species abundance revealed important transient changes highly dependent on the initial plant community composition. Our results suggest that altered cryogenic disturbances cause temporal changes in vegetation dynamics, but the net effects on vegetation communities depend on the composition of initial plant species.\n
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\n \n\n \n \n \n \n \n \n Greenhouse gas emissions from boreal inland waters unchanged after forest harvesting.\n \n \n \n \n\n\n \n Klaus, M.; Geibrink, E.; Jonsson, A.; Bergström, A.; Bastviken, D.; Laudon, H.; Klaminder, J.; and Karlsson, J.\n\n\n \n\n\n\n Biogeosciences, 15(18): 5575–5594. September 2018.\n \n\n\n\n
\n\n\n\n \n \n \"GreenhousePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{klaus_greenhouse_2018,\n\ttitle = {Greenhouse gas emissions from boreal inland waters unchanged after forest harvesting},\n\tvolume = {15},\n\tissn = {1726-4170},\n\turl = {https://www.biogeosciences.net/15/5575/2018/},\n\tdoi = {10.5194/bg-15-5575-2018},\n\tabstract = {{\\textless}p{\\textgreater}{\\textless}strong{\\textgreater}Abstract.{\\textless}/strong{\\textgreater} Forestry practices often result in an increased export of carbon and nitrogen to downstream aquatic systems. Although these losses affect the greenhouse gas (GHG) budget of managed forests, it is unknown if they modify GHG emissions of recipient aquatic systems. To assess this question, air–water fluxes of carbon dioxide ({\\textless}span class="inline-formula"{\\textgreater}CO$_{\\textrm{2}}${\\textless}/span{\\textgreater}), methane ({\\textless}span class="inline-formula"{\\textgreater}CH$_{\\textrm{4}}${\\textless}/span{\\textgreater}) and nitrous oxide ({\\textless}span class="inline-formula"{\\textgreater}N$_{\\textrm{2}}$O{\\textless}/span{\\textgreater}) were quantified for humic lakes and their inlet streams in four boreal catchments using a before-after control-impact experiment. Two catchments were treated with forest clear-cuts followed by site preparation (18{\\textless}span class="thinspace"{\\textgreater}{\\textless}/span{\\textgreater}\\% and 44{\\textless}span class="thinspace"{\\textgreater}{\\textless}/span{\\textgreater}\\% of the catchment area). GHG fluxes and hydrological and physicochemical water characteristics were measured at multiple locations in lakes and streams at high temporal resolution throughout the summer season over a 4-year period. Both lakes and streams evaded all GHGs. The treatment did not significantly change GHG fluxes in streams or lakes within 3 years after the treatment, despite significant increases of {\\textless}span class="inline-formula"{\\textgreater}CO$_{\\textrm{2}}${\\textless}/span{\\textgreater} and {\\textless}span class="inline-formula"{\\textgreater}CH$_{\\textrm{4}}${\\textless}/span{\\textgreater} concentrations in hillslope groundwater. Our results highlight that GHGs leaching from forest clear-cuts may be buffered in the riparian zone–stream continuum, likely acting as effective biogeochemical processors and wind shelters to prevent additional GHG evasion via downstream inland waters. These findings are representative of low productive forests located in relatively flat landscapes where forestry practices cause only a limited initial impact on catchment hydrology and biogeochemistry.{\\textless}/p{\\textgreater}},\n\tlanguage = {English},\n\tnumber = {18},\n\turldate = {2019-05-06},\n\tjournal = {Biogeosciences},\n\tauthor = {Klaus, Marcus and Geibrink, Erik and Jonsson, Anders and Bergström, Ann-Kristin and Bastviken, David and Laudon, Hjalmar and Klaminder, Jonatan and Karlsson, Jan},\n\tmonth = sep,\n\tyear = {2018},\n\tkeywords = {\\#nosource},\n\tpages = {5575--5594},\n}\n\n\n\n
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\n \\textlessp\\textgreater\\textlessstrong\\textgreaterAbstract.\\textless/strong\\textgreater Forestry practices often result in an increased export of carbon and nitrogen to downstream aquatic systems. Although these losses affect the greenhouse gas (GHG) budget of managed forests, it is unknown if they modify GHG emissions of recipient aquatic systems. To assess this question, air–water fluxes of carbon dioxide (\\textlessspan class=\"inline-formula\"\\textgreaterCO$_{\\textrm{2}}$\\textless/span\\textgreater), methane (\\textlessspan class=\"inline-formula\"\\textgreaterCH$_{\\textrm{4}}$\\textless/span\\textgreater) and nitrous oxide (\\textlessspan class=\"inline-formula\"\\textgreaterN$_{\\textrm{2}}$O\\textless/span\\textgreater) were quantified for humic lakes and their inlet streams in four boreal catchments using a before-after control-impact experiment. Two catchments were treated with forest clear-cuts followed by site preparation (18\\textlessspan class=\"thinspace\"\\textgreater\\textless/span\\textgreater% and 44\\textlessspan class=\"thinspace\"\\textgreater\\textless/span\\textgreater% of the catchment area). GHG fluxes and hydrological and physicochemical water characteristics were measured at multiple locations in lakes and streams at high temporal resolution throughout the summer season over a 4-year period. Both lakes and streams evaded all GHGs. The treatment did not significantly change GHG fluxes in streams or lakes within 3 years after the treatment, despite significant increases of \\textlessspan class=\"inline-formula\"\\textgreaterCO$_{\\textrm{2}}$\\textless/span\\textgreater and \\textlessspan class=\"inline-formula\"\\textgreaterCH$_{\\textrm{4}}$\\textless/span\\textgreater concentrations in hillslope groundwater. Our results highlight that GHGs leaching from forest clear-cuts may be buffered in the riparian zone–stream continuum, likely acting as effective biogeochemical processors and wind shelters to prevent additional GHG evasion via downstream inland waters. These findings are representative of low productive forests located in relatively flat landscapes where forestry practices cause only a limited initial impact on catchment hydrology and biogeochemistry.\\textless/p\\textgreater\n
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\n \n\n \n \n \n \n \n \n Winter warming effects on tundra shrub performance are species-specific and dependent on spring conditions.\n \n \n \n \n\n\n \n Krab, E. J.; Rönnefarth, J.; Becher, M.; Blume-Werry, G.; Keuper, F.; Klaminder, J.; Kreyling, J.; Makoto, K.; Milbau, A.; and Dorrepaal, E.\n\n\n \n\n\n\n Journal of Ecology, 106: 599–612. 2018.\n 00000\n\n\n\n
\n\n\n\n \n \n \"WinterPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{krab_winter_2018,\n\ttitle = {Winter warming effects on tundra shrub performance are species-specific and dependent on spring conditions},\n\tvolume = {106},\n\tissn = {1365-2745},\n\turl = {http://onlinelibrary.wiley.com.proxy.ub.umu.se/doi/10.1111/1365-2745.12872/abstract},\n\tdoi = {10.1111/1365-2745.12872},\n\tabstract = {1.Climate change driven increases in winter temperatures positively affect conditions for shrub growth in arctic tundra by decreasing plant frost damage and stimulation of nutrient availability. However, the extent to which shrubs may benefit from these conditions may be strongly dependent on the following spring climate. Species-specific differences in phenology and spring frost sensitivity likely affect shrub growth responses to warming. Additionally, effects of changes in winter and spring climate may differ over small spatial scales, as shrub growth may be dependent on natural variation in snow cover, shrub density and cryoturbation. 2.We investigated the effects of winter warming and altered spring climate on growing-season performance of three common and widespread shrub species in cryoturbated non-sorted circle arctic tundra. By insulating sparsely vegetated non-sorted circles and parts of the surrounding heath with additional snow or gardening fleeces we created two climate change scenarios: Snow addition increased soil temperatures in autumn and winter and delayed snowmelt timing without increasing spring temperatures, whereas fleeces increased soil temperature similarly in autumn and winter, but created warmer spring conditions without altering snowmelt timing. 3.Winter warming affected shrub performance, but the direction and magnitude were species-specific and dependent on spring conditions. Spring warming advanced, and later snowmelt delayed canopy green-up. The fleece treatment did not affect shoot growth and biomass in any shrub species despite decreasing leaf frost-damage in E. nigrum. Snow addition decreased frost damage and stimulated growth of V. vitis-idaea by approximately 50\\%, while decreasing in B. nana growth (P {\\textless} 0.1). All of these effects were consistent in the mostly barren circles and surrounding heath. 4.Synthesis. In cryoturbated arctic tundra, growth of V. vitis-idaea may substantially increase when a thicker snow cover delays snowmelt, whereas in longer-term, warmer winters and springs may favor E. nigrum instead. This may affect shrub community composition and cover, with potentially far-reaching effects on arctic ecosystem functioning via its effects on cryoturbation, carbon cycling and trophic cascading. Our results highlight the importance of disentangling effects of winter and spring climate change timing and nature, as spring conditions are a crucial factor in determining the impact of winter warming on plant performance. This article is protected by copyright. All rights reserved.},\n\tlanguage = {en},\n\turldate = {2017-09-26},\n\tjournal = {Journal of Ecology},\n\tauthor = {Krab, Eveline J. and Rönnefarth, Jonas and Becher, Marina and Blume-Werry, Gesche and Keuper, Frida and Klaminder, Jonatan and Kreyling, Juergen and Makoto, Kobayashi and Milbau, Ann and Dorrepaal, Ellen},\n\tyear = {2018},\n\tnote = {00000},\n\tkeywords = {\\#nosource, Betula nana, Cryoturbation, Empetrum nigrum, Plant phenology, Vaccinium vitis-idaea, shrubs, snow cover, snowmelt timing, spring climate, winter climate change},\n\tpages = {599--612},\n}\n\n\n\n
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\n 1.Climate change driven increases in winter temperatures positively affect conditions for shrub growth in arctic tundra by decreasing plant frost damage and stimulation of nutrient availability. However, the extent to which shrubs may benefit from these conditions may be strongly dependent on the following spring climate. Species-specific differences in phenology and spring frost sensitivity likely affect shrub growth responses to warming. Additionally, effects of changes in winter and spring climate may differ over small spatial scales, as shrub growth may be dependent on natural variation in snow cover, shrub density and cryoturbation. 2.We investigated the effects of winter warming and altered spring climate on growing-season performance of three common and widespread shrub species in cryoturbated non-sorted circle arctic tundra. By insulating sparsely vegetated non-sorted circles and parts of the surrounding heath with additional snow or gardening fleeces we created two climate change scenarios: Snow addition increased soil temperatures in autumn and winter and delayed snowmelt timing without increasing spring temperatures, whereas fleeces increased soil temperature similarly in autumn and winter, but created warmer spring conditions without altering snowmelt timing. 3.Winter warming affected shrub performance, but the direction and magnitude were species-specific and dependent on spring conditions. Spring warming advanced, and later snowmelt delayed canopy green-up. The fleece treatment did not affect shoot growth and biomass in any shrub species despite decreasing leaf frost-damage in E. nigrum. Snow addition decreased frost damage and stimulated growth of V. vitis-idaea by approximately 50%, while decreasing in B. nana growth (P \\textless 0.1). All of these effects were consistent in the mostly barren circles and surrounding heath. 4.Synthesis. In cryoturbated arctic tundra, growth of V. vitis-idaea may substantially increase when a thicker snow cover delays snowmelt, whereas in longer-term, warmer winters and springs may favor E. nigrum instead. This may affect shrub community composition and cover, with potentially far-reaching effects on arctic ecosystem functioning via its effects on cryoturbation, carbon cycling and trophic cascading. Our results highlight the importance of disentangling effects of winter and spring climate change timing and nature, as spring conditions are a crucial factor in determining the impact of winter warming on plant performance. This article is protected by copyright. All rights reserved.\n
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\n \n\n \n \n \n \n \n \n Using laboratory incubations to predict the fate of pharmaceuticals in aquatic ecosystems.\n \n \n \n \n\n\n \n Fahlman, J.; Fick, J.; Karlsson, J.; Jonsson, M.; Brodin, T.; and Klaminder, J.\n\n\n \n\n\n\n Environmental Chemistry, 15(8): 463–471. November 2018.\n \n\n\n\n
\n\n\n\n \n \n \"UsingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{fahlman_using_2018,\n\ttitle = {Using laboratory incubations to predict the fate of pharmaceuticals in aquatic ecosystems},\n\tvolume = {15},\n\tissn = {1449-8979},\n\turl = {http://www.publish.csiro.au/EN/EN18154},\n\tdoi = {10.1071/EN18154},\n\tabstract = {Environmental context Environmental persistence of excreted pharmaceuticals in aquatic ecosystems is usually predicted using small-scale laboratory experiments assumed to simulate natural conditions. We studied five pharmaceuticals comparing their removal rates from water under laboratory conditions and under natural environmental conditions existing in a large pond. We found that the laboratory conditions did not fully capture the complexity within the pond, which led to different removal rates in the two systems. Abstract Environmental persistence is a key property when evaluating risks with excreted pharmaceuticals in aquatic ecosystems. Such persistence is typically predicted using small-scale laboratory incubations, but the variation in aquatic environments and scarcity of field studies to verify laboratory-based persistence estimates create uncertainties around the predictive power of these incubations. In this study we: (1) assess the persistence of five pharmaceuticals (diclofenac, diphenhydramine, hydroxyzine, trimethoprim and oxazepam) in laboratory experiments under different environmental conditions; and (2) use a three-month-long field study in an aquatic ecosystem to verify the laboratory-based persistence estimates. In our laboratory assays, we found that water temperature (TEMP), concentrations of organic solutes (TOC), presence of sediment (SED), and solar radiation (SOL) individually affected dissipation rates. Moreover, we identified rarely studied interaction effects between the treatments (i.e. SOL × SED and TEMP × SOL), which affected the persistence of the studied drugs. Half-lives obtained from the laboratory assays largely explained the dissipation rates during the first week of the field study. However, none of the applied models could accurately predict the long-term dissipation rates (month time-scale) from the water column. For example, the studied antibioticum (trimethoprim) and the anti-anxiety drug (oxazepam) remained at detectable levels in the aquatic environment long after ({\\textasciitilde}150 days) our laboratory based models predicted complete dissipation. We conclude that small-scale laboratory incubations seem sufficient to approximate the short-term (i.e. within a week) dissipation rate of drugs in aquatic ecosystems. However, this simplistic approach does not capture interacting environmental processes that preserve a fraction of the dissolved pharmaceuticals for months in natural water bodies.},\n\tlanguage = {en},\n\tnumber = {8},\n\turldate = {2019-02-21},\n\tjournal = {Environmental Chemistry},\n\tauthor = {Fahlman, Johan and Fick, Jerker and Karlsson, Jan and Jonsson, Micael and Brodin, Tomas and Klaminder, Jonatan},\n\tmonth = nov,\n\tyear = {2018},\n\tkeywords = {\\#nosource},\n\tpages = {463--471},\n}\n\n\n\n
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\n Environmental context Environmental persistence of excreted pharmaceuticals in aquatic ecosystems is usually predicted using small-scale laboratory experiments assumed to simulate natural conditions. We studied five pharmaceuticals comparing their removal rates from water under laboratory conditions and under natural environmental conditions existing in a large pond. We found that the laboratory conditions did not fully capture the complexity within the pond, which led to different removal rates in the two systems. Abstract Environmental persistence is a key property when evaluating risks with excreted pharmaceuticals in aquatic ecosystems. Such persistence is typically predicted using small-scale laboratory incubations, but the variation in aquatic environments and scarcity of field studies to verify laboratory-based persistence estimates create uncertainties around the predictive power of these incubations. In this study we: (1) assess the persistence of five pharmaceuticals (diclofenac, diphenhydramine, hydroxyzine, trimethoprim and oxazepam) in laboratory experiments under different environmental conditions; and (2) use a three-month-long field study in an aquatic ecosystem to verify the laboratory-based persistence estimates. In our laboratory assays, we found that water temperature (TEMP), concentrations of organic solutes (TOC), presence of sediment (SED), and solar radiation (SOL) individually affected dissipation rates. Moreover, we identified rarely studied interaction effects between the treatments (i.e. SOL × SED and TEMP × SOL), which affected the persistence of the studied drugs. Half-lives obtained from the laboratory assays largely explained the dissipation rates during the first week of the field study. However, none of the applied models could accurately predict the long-term dissipation rates (month time-scale) from the water column. For example, the studied antibioticum (trimethoprim) and the anti-anxiety drug (oxazepam) remained at detectable levels in the aquatic environment long after (~150 days) our laboratory based models predicted complete dissipation. We conclude that small-scale laboratory incubations seem sufficient to approximate the short-term (i.e. within a week) dissipation rate of drugs in aquatic ecosystems. However, this simplistic approach does not capture interacting environmental processes that preserve a fraction of the dissolved pharmaceuticals for months in natural water bodies.\n
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\n \n\n \n \n \n \n \n \n Utilising a Suite of Isotopic and Elemental Tracers to Constrain Cryoturbation Rates and Patterns in a Non-sorted Circle.\n \n \n \n \n\n\n \n Jelinski, N. A.; Yoo, K.; and Klaminder, J.\n\n\n \n\n\n\n Permafrost and Periglacial Processes, 28(4): 634–648. 2017.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.1944\n\n\n\n
\n\n\n\n \n \n \"UtilisingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{jelinski_utilising_2017,\n\ttitle = {Utilising a {Suite} of {Isotopic} and {Elemental} {Tracers} to {Constrain} {Cryoturbation} {Rates} and {Patterns} in a {Non}-sorted {Circle}},\n\tvolume = {28},\n\tcopyright = {Copyright © 2017 John Wiley \\& Sons, Ltd.},\n\tissn = {1099-1530},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ppp.1944},\n\tdoi = {10.1002/ppp.1944},\n\tabstract = {The empirical quantification of rates of material movement in cryoturbated soils has lagged behind the physical and chemical characterisation of these materials. We applied a novel suite of elemental (C, Hg), stable isotope (13C) and radioisotope (137Cs, 210Pb, 14C, 10Be) tracers in conjunction with analytical and numerical models to constrain the rates and patterns of soil movement due to cryoturbation in a non-sorted circle (NSC) near Abisko, Sweden. We present the first observations of the variability of 10Be across a patterned-ground feature, which facilitate the interpretation of subsurface peaks in soil organic carbon, Hg and 13C and provide constraints on the surficial histories of cryoturbated materials. Apparent rates of surficial lateral movement across the NSC estimated from 137Cs and 210Pb (0–2.55 cm year−1) decreased with distance from its centre and were an order of magnitude greater than rates of subduction and subsurface movement estimated from 14C (0.04–0.27 cm year−1). Novel estimates of the original surficial residence times of cryoturbated parcels based on excess 10Be and Hg inventories ranged from 238 to 3940 years. Our results demonstrate the utility of the spatially explicit application of elemental and radioisotopic tracer suites to constrain cryoturbation rates in Arctic patterned ground. Copyright © 2017 John Wiley \\& Sons, Ltd.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2024-03-27},\n\tjournal = {Permafrost and Periglacial Processes},\n\tauthor = {Jelinski, Nicolas A. and Yoo, Kyungsoo and Klaminder, Jonatan},\n\tyear = {2017},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.1944},\n\tkeywords = {\\#nosource, 10Be, 137Cs, 14C, 210Pb, Cryoturbation, cryoturbation, non-sorted circle},\n\tpages = {634--648},\n}\n\n\n\n
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\n The empirical quantification of rates of material movement in cryoturbated soils has lagged behind the physical and chemical characterisation of these materials. We applied a novel suite of elemental (C, Hg), stable isotope (13C) and radioisotope (137Cs, 210Pb, 14C, 10Be) tracers in conjunction with analytical and numerical models to constrain the rates and patterns of soil movement due to cryoturbation in a non-sorted circle (NSC) near Abisko, Sweden. We present the first observations of the variability of 10Be across a patterned-ground feature, which facilitate the interpretation of subsurface peaks in soil organic carbon, Hg and 13C and provide constraints on the surficial histories of cryoturbated materials. Apparent rates of surficial lateral movement across the NSC estimated from 137Cs and 210Pb (0–2.55 cm year−1) decreased with distance from its centre and were an order of magnitude greater than rates of subduction and subsurface movement estimated from 14C (0.04–0.27 cm year−1). Novel estimates of the original surficial residence times of cryoturbated parcels based on excess 10Be and Hg inventories ranged from 238 to 3940 years. Our results demonstrate the utility of the spatially explicit application of elemental and radioisotopic tracer suites to constrain cryoturbation rates in Arctic patterned ground. Copyright © 2017 John Wiley & Sons, Ltd.\n
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\n \n\n \n \n \n \n \n \n Tracing Pb Pollution Penetration in Temperate Podzols.\n \n \n \n \n\n\n \n Ferro-Vázquez, C.; Pérez-Rodríguez, M.; Nóvoa-Muñoz, J. C.; Klaminder, J.; Bindler, R.; and Martínez Cortizas, A.\n\n\n \n\n\n\n Land Degradation & Development, 28(8): 2432–2445. 2017.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ldr.2777\n\n\n\n
\n\n\n\n \n \n \"TracingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{ferro-vazquez_tracing_2017,\n\ttitle = {Tracing {Pb} {Pollution} {Penetration} in {Temperate} {Podzols}},\n\tvolume = {28},\n\tcopyright = {Copyright © 2017 John Wiley \\& Sons, Ltd.},\n\tissn = {1099-145X},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ldr.2777},\n\tdoi = {10.1002/ldr.2777},\n\tabstract = {We combine high-resolution soil sampling with lead (Pb) analyses (concentrations and stable isotopes) in two temperate podzols, together with previous data obtained with selective Al and Fe dissolution techniques. We aim to assess how atmospheric Pb is incorporated into the soils during pedogenesis. Partial least squares modelling for Pb concentrations shows that the podzolization process has the largest effect on Pb concentration (80·3\\% of the variance). The proportion of inorganic secondary compounds, the input of fresh organic matter from the soil surface and the relative abundance of Fe versus Al are responsible for a small part of the Pb concentration variance. Lead isotopic composition (206Pb/207Pb ratios) depends on soil organic matter content either fresh/poorly humified (57·3\\% of the variance) or humified (24·7\\% of the variance). The Pb linked to inorganic compounds and the overall podzolization process play a minor role in isotopic signature (5·3 and 3·7\\% of the variance respectively). Soil pH appears to be the controlling variable of the different transport and retention mechanisms. The relatively low isotopic ratios observed in spodic horizons result from geogenic Pb released through the preferential dissolution of the isotopically distinct most weatherable minerals of the parent material in the eluvial horizons, which undergoes downward mobilization. An accurate knowledge of soil reactive components and formation mechanisms is essential to a correct diagnose of the scope of Pb pollution and a more effective design of remediation strategies. Copyright © 2017 John Wiley \\& Sons, Ltd.},\n\tlanguage = {en},\n\tnumber = {8},\n\turldate = {2024-03-27},\n\tjournal = {Land Degradation \\& Development},\n\tauthor = {Ferro-Vázquez, Cruz and Pérez-Rodríguez, Marta and Nóvoa-Muñoz, Juan Carlos and Klaminder, Jonatan and Bindler, Richard and Martínez Cortizas, Antonio},\n\tyear = {2017},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ldr.2777},\n\tkeywords = {\\#nosource, Lead isotopes, Partial Least Squares modelling, atmospheric deposition, lead isotopes, partial least squares modelling, podzols},\n\tpages = {2432--2445},\n}\n\n\n\n
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\n We combine high-resolution soil sampling with lead (Pb) analyses (concentrations and stable isotopes) in two temperate podzols, together with previous data obtained with selective Al and Fe dissolution techniques. We aim to assess how atmospheric Pb is incorporated into the soils during pedogenesis. Partial least squares modelling for Pb concentrations shows that the podzolization process has the largest effect on Pb concentration (80·3% of the variance). The proportion of inorganic secondary compounds, the input of fresh organic matter from the soil surface and the relative abundance of Fe versus Al are responsible for a small part of the Pb concentration variance. Lead isotopic composition (206Pb/207Pb ratios) depends on soil organic matter content either fresh/poorly humified (57·3% of the variance) or humified (24·7% of the variance). The Pb linked to inorganic compounds and the overall podzolization process play a minor role in isotopic signature (5·3 and 3·7% of the variance respectively). Soil pH appears to be the controlling variable of the different transport and retention mechanisms. The relatively low isotopic ratios observed in spodic horizons result from geogenic Pb released through the preferential dissolution of the isotopically distinct most weatherable minerals of the parent material in the eluvial horizons, which undergoes downward mobilization. An accurate knowledge of soil reactive components and formation mechanisms is essential to a correct diagnose of the scope of Pb pollution and a more effective design of remediation strategies. Copyright © 2017 John Wiley & Sons, Ltd.\n
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\n \n\n \n \n \n \n \n \n Effects of warming and increased nitrogen and sulfur deposition on boreal mire geochemistry.\n \n \n \n \n\n\n \n Olid, C.; Bindler, R.; Nilsson, M. B.; Eriksson, T.; and Klaminder, J.\n\n\n \n\n\n\n Applied Geochemistry, 78: 149–157. March 2017.\n 00000\n\n\n\n
\n\n\n\n \n \n \"EffectsPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{olid_effects_2017,\n\ttitle = {Effects of warming and increased nitrogen and sulfur deposition on boreal mire geochemistry},\n\tvolume = {78},\n\tissn = {0883-2927},\n\turl = {http://www.sciencedirect.com/science/article/pii/S088329271630230X},\n\tdoi = {10.1016/j.apgeochem.2016.12.015},\n\tabstract = {Boreal mire ecosystems are predicted to experience warmer air temperatures as well as changed deposition loads of nitrogen and sulfur during the coming century. In this study, we hypothesized that vegetation changes that accompany these new environmental conditions alter the chemical composition of peat. To test this hypothesis, we quantified changes in peat geochemistry (Al, Ca, Fe, Mg, Na, P, Pb, and Zn) that have occurred in field manipulation plots exposed to 12 years of warming and nitrogen and sulfur additions in a nutrient-poor boreal mire. In contrast to non-nutrients with a mainly atmospheric origin (i.e. Pb), Al-normalized inventories of micronutrients (Zn and Fe) and macronutrients (P and Ca) were significantly (P \\&lt; 0.05) higher as a result of warming. For P and Ca, enrichments were also induced by nitrogen additions alone. These results suggest that mires evolving under increasing temperatures and availability of nitrogen are around two times more effective in storing nutrients in the accumulating peat. Our study provides the first empirical evidence that predicted changes in climate and nitrogen deposition scenarios will increase the retention of Ca, Fe, P, and Zn in surface peat of boreal mires in the near future, which may cause a depletion of nutrients released to inland waters dependent on mire inputs.},\n\turldate = {2017-04-28},\n\tjournal = {Applied Geochemistry},\n\tauthor = {Olid, Carolina and Bindler, Richard and Nilsson, Mats B. and Eriksson, Tobias and Klaminder, Jonatan},\n\tmonth = mar,\n\tyear = {2017},\n\tnote = {00000},\n\tkeywords = {\\#nosource, Mire, Nitrogen, Peat geochemistry, climate change, nutrients, temperature},\n\tpages = {149--157},\n}\n\n\n\n
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\n Boreal mire ecosystems are predicted to experience warmer air temperatures as well as changed deposition loads of nitrogen and sulfur during the coming century. In this study, we hypothesized that vegetation changes that accompany these new environmental conditions alter the chemical composition of peat. To test this hypothesis, we quantified changes in peat geochemistry (Al, Ca, Fe, Mg, Na, P, Pb, and Zn) that have occurred in field manipulation plots exposed to 12 years of warming and nitrogen and sulfur additions in a nutrient-poor boreal mire. In contrast to non-nutrients with a mainly atmospheric origin (i.e. Pb), Al-normalized inventories of micronutrients (Zn and Fe) and macronutrients (P and Ca) were significantly (P < 0.05) higher as a result of warming. For P and Ca, enrichments were also induced by nitrogen additions alone. These results suggest that mires evolving under increasing temperatures and availability of nitrogen are around two times more effective in storing nutrients in the accumulating peat. Our study provides the first empirical evidence that predicted changes in climate and nitrogen deposition scenarios will increase the retention of Ca, Fe, P, and Zn in surface peat of boreal mires in the near future, which may cause a depletion of nutrients released to inland waters dependent on mire inputs.\n
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\n \n\n \n \n \n \n \n \n Environmental relevant levels of a benzodiazepine (oxazepam) alters important behavioral traits in a common planktivorous fish, (Rutilus rutilus).\n \n \n \n \n\n\n \n Brodin, T.; Nordling, J.; Lagesson, A.; Klaminder, J.; Hellström, G.; Christensen, B.; and Fick, J.\n\n\n \n\n\n\n Journal of Toxicology and Environmental Health, Part A, 0(0): 1–8. August 2017.\n 00000 \n\n\n\n
\n\n\n\n \n \n \"EnvironmentalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{brodin_environmental_2017,\n\ttitle = {Environmental relevant levels of a benzodiazepine (oxazepam) alters important behavioral traits in a common planktivorous fish, ({Rutilus} rutilus)},\n\tvolume = {0},\n\tissn = {1528-7394},\n\turl = {http://dx.doi.org/10.1080/15287394.2017.1352214},\n\tdoi = {10.1080/15287394.2017.1352214},\n\tabstract = {Environmental pollution by pharmaceuticals is increasingly recognized as a major threat to aquatic ecosystems worldwide. A complex mix of pharmaceuticals enters waterways via treated wastewater effluent and many remain biochemically active after the drugs reach aquatic systems. However, to date little is known regarding the ecological effects that might arise following pharmaceutical contamination of aquatic environments. One group of particular concern is behaviorally modifying pharmaceuticals as seemingly minor changes in behavior may initiate marked ecological consequences. The aim of this study was to examine the influence of a benzodiazepine anxiolytic drug (oxazepam) on key behavioral traits in wild roach (Rutilus rutilus) at concentrations similar to those encountered in effluent surface waters. Roach exposed to water with high concentrations of oxazepam (280 µg/L) exhibited increased boldness, while roach at low treatment (0.84 µg/L) became bolder and more active compared to control fish. Our results reinforce the notion that anxiolytic drugs may be affecting fish behavior in natural systems, emphasizing the need for further research on ecological impacts of pharmaceuticals in aquatic systems and development of new tools to incorporate ecologically relevant behavioral endpoints into ecotoxicological risk assessment.},\n\tnumber = {0},\n\turldate = {2017-09-11},\n\tjournal = {Journal of Toxicology and Environmental Health, Part A},\n\tauthor = {Brodin, Tomas and Nordling, Johanna and Lagesson, Annelie and Klaminder, Jonatan and Hellström, Gustav and Christensen, Bent and Fick, Jerker},\n\tmonth = aug,\n\tyear = {2017},\n\tpmid = {28829722},\n\tnote = {00000 },\n\tkeywords = {\\#nosource},\n\tpages = {1--8},\n}\n\n\n\n
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\n Environmental pollution by pharmaceuticals is increasingly recognized as a major threat to aquatic ecosystems worldwide. A complex mix of pharmaceuticals enters waterways via treated wastewater effluent and many remain biochemically active after the drugs reach aquatic systems. However, to date little is known regarding the ecological effects that might arise following pharmaceutical contamination of aquatic environments. One group of particular concern is behaviorally modifying pharmaceuticals as seemingly minor changes in behavior may initiate marked ecological consequences. The aim of this study was to examine the influence of a benzodiazepine anxiolytic drug (oxazepam) on key behavioral traits in wild roach (Rutilus rutilus) at concentrations similar to those encountered in effluent surface waters. Roach exposed to water with high concentrations of oxazepam (280 µg/L) exhibited increased boldness, while roach at low treatment (0.84 µg/L) became bolder and more active compared to control fish. Our results reinforce the notion that anxiolytic drugs may be affecting fish behavior in natural systems, emphasizing the need for further research on ecological impacts of pharmaceuticals in aquatic systems and development of new tools to incorporate ecologically relevant behavioral endpoints into ecotoxicological risk assessment.\n
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\n \n\n \n \n \n \n \n \n Refining particle positions using circular symmetry.\n \n \n \n \n\n\n \n Rodriguez, A.; Zhang, H.; Wiklund, K.; Brodin, T.; Klaminder, J.; Andersson, P.; and Andersson, M.\n\n\n \n\n\n\n PLOS ONE, 12(4): e0175015. April 2017.\n 00000\n\n\n\n
\n\n\n\n \n \n \"RefiningPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{rodriguez_refining_2017,\n\ttitle = {Refining particle positions using circular symmetry},\n\tvolume = {12},\n\tissn = {1932-6203},\n\turl = {http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0175015},\n\tdoi = {10.1371/journal.pone.0175015},\n\tabstract = {Particle and object tracking is gaining attention in industrial applications and is commonly applied in: colloidal, biophysical, ecological, and micro-fluidic research. Reliable tracking information is heavily dependent on the system under study and algorithms that correctly determine particle position between images. However, in a real environmental context with the presence of noise including particular or dissolved matter in water, and low and fluctuating light conditions, many algorithms fail to obtain reliable information. We propose a new algorithm, the Circular Symmetry algorithm (C-Sym), for detecting the position of a circular particle with high accuracy and precision in noisy conditions. The algorithm takes advantage of the spatial symmetry of the particle allowing for subpixel accuracy. We compare the proposed algorithm with four different methods using both synthetic and experimental datasets. The results show that C-Sym is the most accurate and precise algorithm when tracking micro-particles in all tested conditions and it has the potential for use in applications including tracking biota in their environment.},\n\tnumber = {4},\n\turldate = {2017-09-11},\n\tjournal = {PLOS ONE},\n\tauthor = {Rodriguez, Alvaro and Zhang, Hanqing and Wiklund, Krister and Brodin, Tomas and Klaminder, Jonatan and Andersson, Patrik and Andersson, Magnus},\n\tmonth = apr,\n\tyear = {2017},\n\tnote = {00000},\n\tkeywords = {\\#nosource, Algorithms, Diffraction, Experimental design, Fluorescence imaging, Fluorescence microscopy, Interpolation, Polynomials, Symmetry},\n\tpages = {e0175015},\n}\n\n\n\n
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\n Particle and object tracking is gaining attention in industrial applications and is commonly applied in: colloidal, biophysical, ecological, and micro-fluidic research. Reliable tracking information is heavily dependent on the system under study and algorithms that correctly determine particle position between images. However, in a real environmental context with the presence of noise including particular or dissolved matter in water, and low and fluctuating light conditions, many algorithms fail to obtain reliable information. We propose a new algorithm, the Circular Symmetry algorithm (C-Sym), for detecting the position of a circular particle with high accuracy and precision in noisy conditions. The algorithm takes advantage of the spatial symmetry of the particle allowing for subpixel accuracy. We compare the proposed algorithm with four different methods using both synthetic and experimental datasets. The results show that C-Sym is the most accurate and precise algorithm when tracking micro-particles in all tested conditions and it has the potential for use in applications including tracking biota in their environment.\n
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\n \n\n \n \n \n \n \n \n Boreal Forests Sequester Large Amounts of Mercury over Millennial Time Scales in the Absence of Wildfire.\n \n \n \n \n\n\n \n Giesler, R.; Clemmensen, K. E.; Wardle, D. A.; Klaminder, J.; and Bindler, R.\n\n\n \n\n\n\n Environmental Science & Technology, 51(5): 2621–2627. March 2017.\n 00000\n\n\n\n
\n\n\n\n \n \n \"BorealPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@article{giesler_boreal_2017,\n\ttitle = {Boreal {Forests} {Sequester} {Large} {Amounts} of {Mercury} over {Millennial} {Time} {Scales} in the {Absence} of {Wildfire}},\n\tvolume = {51},\n\tissn = {0013-936X},\n\turl = {http://dx.doi.org/10.1021/acs.est.6b06369},\n\tdoi = {10.1021/acs.est.6b06369},\n\tabstract = {Alterations in fire activity due to climate change and fire suppression may have profound effects on the balance between storage and release of carbon (C) and associated volatile elements. Stored soil mercury (Hg) is known to volatilize due to wildfires and this could substantially affect the land-air exchange of Hg; conversely the absence of fires and human disturbance may increase the time period over which Hg is sequestered. Here we show for a wildfire chronosequence spanning over more than 5000 years in boreal forest in northern Sweden that belowground inventories of total Hg are strongly related to soil humus C accumulation (R2 = 0.94, p {\\textless} 0.001). Our data clearly show that northern boreal forest soils have a strong sink capacity for Hg, and indicate that the sequestered Hg is bound in soil organic matter pools accumulating over millennia. Our results also suggest that more than half of the Hg stock in the sites with the longest time since fire originates from deposition predating the onset of large-scale anthropogenic emissions. This study emphasizes the importance of boreal forest humus soils for Hg storage and reveals that this pool is likely to persist over millennial time scales in the prolonged absence of fire.},\n\tnumber = {5},\n\turldate = {2017-09-11},\n\tjournal = {Environmental Science \\& Technology},\n\tauthor = {Giesler, Reiner and Clemmensen, Karina E. and Wardle, David A. and Klaminder, Jonatan and Bindler, Richard},\n\tmonth = mar,\n\tyear = {2017},\n\tnote = {00000},\n\tkeywords = {\\#nosource},\n\tpages = {2621--2627},\n}\n\n\n\n
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\n Alterations in fire activity due to climate change and fire suppression may have profound effects on the balance between storage and release of carbon (C) and associated volatile elements. Stored soil mercury (Hg) is known to volatilize due to wildfires and this could substantially affect the land-air exchange of Hg; conversely the absence of fires and human disturbance may increase the time period over which Hg is sequestered. Here we show for a wildfire chronosequence spanning over more than 5000 years in boreal forest in northern Sweden that belowground inventories of total Hg are strongly related to soil humus C accumulation (R2 = 0.94, p \\textless 0.001). Our data clearly show that northern boreal forest soils have a strong sink capacity for Hg, and indicate that the sequestered Hg is bound in soil organic matter pools accumulating over millennia. Our results also suggest that more than half of the Hg stock in the sites with the longest time since fire originates from deposition predating the onset of large-scale anthropogenic emissions. This study emphasizes the importance of boreal forest humus soils for Hg storage and reveals that this pool is likely to persist over millennial time scales in the prolonged absence of fire.\n
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\n \n\n \n \n \n \n \n \n Screening of benzodiazepines in thirty European rivers.\n \n \n \n \n\n\n \n Fick, J.; Brodin, T.; Heynen, M.; Klaminder, J.; Jonsson, M.; Grabicova, K.; Randak, T.; Grabic, R.; Kodes, V.; Slobodnik, J.; Sweetman, A.; Earnshaw, M.; Barra Caracciolo, A.; Lettieri, T.; and Loos, R.\n\n\n \n\n\n\n Chemosphere, 176: 324–332. June 2017.\n 00003\n\n\n\n
\n\n\n\n \n \n \"ScreeningPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{fick_screening_2017,\n\ttitle = {Screening of benzodiazepines in thirty {European} rivers},\n\tvolume = {176},\n\tissn = {0045-6535},\n\turl = {http://www.sciencedirect.com/science/article/pii/S0045653517303156},\n\tdoi = {10.1016/j.chemosphere.2017.02.126},\n\tabstract = {Pharmaceuticals as environmental contaminants have received a lot of interest over the past decade but, for several pharmaceuticals, relatively little is known about their occurrence in European surface waters. Benzodiazepines, a class of pharmaceuticals with anxiolytic properties, have received interest due to their behavioral modifying effect on exposed biota. In this study, our results show the presence of one or more benzodiazepine(s) in 86\\% of the analyzed surface water samples (n = 138) from 30 rivers, representing seven larger European catchments. Of the 13 benzodiazepines included in the study, we detected 9, which together showed median and mean concentrations (of the results above limit of quantification) of 5.4 and 9.6 ng L−1, respectively. Four benzodiazepines (oxazepam, temazepam, clobazam, and bromazepam) were the most commonly detected. In particular, oxazepam had the highest frequency of detection (85\\%) and a maximum concentration of 61 ng L−1. Temazepam and clobazam were found in 26\\% (maximum concentration of 39 ng L−1) and 14\\% (maximum concentration of 11 ng L−1) of the samples analyzed, respectively. Finally, bromazepam was found only in Germany and in 16 out of total 138 samples (12\\%), with a maximum concentration of 320 ng L−1. This study clearly shows that benzodiazepines are common micro-contaminants of the largest European river systems at ng L−1 levels. Although these concentrations are more than a magnitude lower than those reported to have effective effects on exposed biota, environmental effects cannot be excluded considering the possibility of additive and sub-lethal effects.},\n\turldate = {2017-03-06},\n\tjournal = {Chemosphere},\n\tauthor = {Fick, Jerker and Brodin, Tomas and Heynen, Martina and Klaminder, Jonatan and Jonsson, Micael and Grabicova, Katerina and Randak, Tomas and Grabic, Roman and Kodes, Vit and Slobodnik, Jaroslav and Sweetman, Andrew and Earnshaw, Mark and Barra Caracciolo, Anna and Lettieri, Teresa and Loos, Robert},\n\tmonth = jun,\n\tyear = {2017},\n\tnote = {00003},\n\tkeywords = {\\#nosource, Anxiolytics, Bromazepam, Clobazam, Oxazepam, Temazepam},\n\tpages = {324--332},\n}\n\n\n\n
\n
\n\n\n
\n Pharmaceuticals as environmental contaminants have received a lot of interest over the past decade but, for several pharmaceuticals, relatively little is known about their occurrence in European surface waters. Benzodiazepines, a class of pharmaceuticals with anxiolytic properties, have received interest due to their behavioral modifying effect on exposed biota. In this study, our results show the presence of one or more benzodiazepine(s) in 86% of the analyzed surface water samples (n = 138) from 30 rivers, representing seven larger European catchments. Of the 13 benzodiazepines included in the study, we detected 9, which together showed median and mean concentrations (of the results above limit of quantification) of 5.4 and 9.6 ng L−1, respectively. Four benzodiazepines (oxazepam, temazepam, clobazam, and bromazepam) were the most commonly detected. In particular, oxazepam had the highest frequency of detection (85%) and a maximum concentration of 61 ng L−1. Temazepam and clobazam were found in 26% (maximum concentration of 39 ng L−1) and 14% (maximum concentration of 11 ng L−1) of the samples analyzed, respectively. Finally, bromazepam was found only in Germany and in 16 out of total 138 samples (12%), with a maximum concentration of 320 ng L−1. This study clearly shows that benzodiazepines are common micro-contaminants of the largest European river systems at ng L−1 levels. Although these concentrations are more than a magnitude lower than those reported to have effective effects on exposed biota, environmental effects cannot be excluded considering the possibility of additive and sub-lethal effects.\n
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\n  \n 2016\n \n \n (5)\n \n \n
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\n \n\n \n \n \n \n \n \n Drug-Induced Behavioral Changes: Using Laboratory Observations to Predict Field Observations.\n \n \n \n \n\n\n \n Klaminder, J.; Hellström, G.; Fahlman, J.; Jonsson, M.; Fick, J.; Lagesson, A.; Bergman, E.; and Brodin, T.\n\n\n \n\n\n\n Frontiers in Environmental Science, 4: 00081. 2016.\n 00005\n\n\n\n
\n\n\n\n \n \n \"Drug-InducedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@article{klaminder_drug-induced_2016,\n\ttitle = {Drug-{Induced} {Behavioral} {Changes}: {Using} {Laboratory} {Observations} to {Predict} {Field} {Observations}},\n\tvolume = {4},\n\tissn = {2296-665X},\n\tshorttitle = {Drug-{Induced} {Behavioral} {Changes}},\n\turl = {http://journal.frontiersin.org/article/10.3389/fenvs.2016.00081/abstract},\n\tdoi = {10.3389/fenvs.2016.00081},\n\tabstract = {Behavioral assays constitute important research tools when assessing how fish respond to environmental change. However, it is unclear how behavioral modifications recorded in laboratory assays are expressed in natural ecosystems, a limitation that makes it difficult to evaluate the predictive power of laboratory-based measurements. In this study, we hypothesized that exposure to a benzodiazepine (i.e., oxazepam) increases boldness and activity in laboratory assays as well as in field assays – that is, laboratory results can be used to predict field results. Moreover, we expected the modified behavior to affect other important ecological measures such as habitat selection and home range. To test our hypothesis, we exposed European perch (Perca fluviatilis) to oxazepam and measured subsequent changes in behavioral trials both in laboratory assays and in a lake ecosystem populated with a predatory fish species, pike (Esox lucius). In the lake, the positions of both perch and pike were tracked every three minutes for a month using acoustic telemetry. In the laboratory assay, the oxazepam-exposed perch were bolder and more active than the non-exposed perch. In the lake assay, the oxazepam-exposed perch were also more bold and active, had a larger home range, and used pelagic habitats more than the non-exposed perch. We conclude that ecotoxicological behavioral assays are useful for predicting the effects of exposure in natural systems. However, although individual responses to exposure were similar in both the laboratory and field trials, effects were more obvious in the field study, mainly due to reduced variability in the behavior measures from the lake. Hence, short-term behavioral assays may fail to detect all the effects expressed in natural environments. Nevertheless, our study clearly demonstrates that behavior modifications observed in laboratory settings can be used to predict how fish perform in aquatic ecosystems.},\n\tlanguage = {English},\n\turldate = {2017-01-03},\n\tjournal = {Frontiers in Environmental Science},\n\tauthor = {Klaminder, Jonatan and Hellström, Gustav and Fahlman, Johan and Jonsson, Micael and Fick, Jerker and Lagesson, Annelie and Bergman, Eva and Brodin, Tomas},\n\tyear = {2016},\n\tnote = {00005},\n\tkeywords = {\\#nosource, Anxiety, Field manipulation, GABAergic, Landscape of fear, behaviour},\n\tpages = {00081},\n}\n\n\n\n
\n
\n\n\n
\n Behavioral assays constitute important research tools when assessing how fish respond to environmental change. However, it is unclear how behavioral modifications recorded in laboratory assays are expressed in natural ecosystems, a limitation that makes it difficult to evaluate the predictive power of laboratory-based measurements. In this study, we hypothesized that exposure to a benzodiazepine (i.e., oxazepam) increases boldness and activity in laboratory assays as well as in field assays – that is, laboratory results can be used to predict field results. Moreover, we expected the modified behavior to affect other important ecological measures such as habitat selection and home range. To test our hypothesis, we exposed European perch (Perca fluviatilis) to oxazepam and measured subsequent changes in behavioral trials both in laboratory assays and in a lake ecosystem populated with a predatory fish species, pike (Esox lucius). In the lake, the positions of both perch and pike were tracked every three minutes for a month using acoustic telemetry. In the laboratory assay, the oxazepam-exposed perch were bolder and more active than the non-exposed perch. In the lake assay, the oxazepam-exposed perch were also more bold and active, had a larger home range, and used pelagic habitats more than the non-exposed perch. We conclude that ecotoxicological behavioral assays are useful for predicting the effects of exposure in natural systems. However, although individual responses to exposure were similar in both the laboratory and field trials, effects were more obvious in the field study, mainly due to reduced variability in the behavior measures from the lake. Hence, short-term behavioral assays may fail to detect all the effects expressed in natural environments. Nevertheless, our study clearly demonstrates that behavior modifications observed in laboratory settings can be used to predict how fish perform in aquatic ecosystems.\n
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\n \n\n \n \n \n \n \n \n Is the subarctic landscape still a carbon sink? Evidence from a detailed catchment balance.\n \n \n \n \n\n\n \n Lundin, E. J.; Klaminder, J.; Giesler, R.; Persson, A.; Olefeldt, D.; Heliasz, M.; Christensen, T. R.; and Karlsson, J.\n\n\n \n\n\n\n Geophysical Research Letters, 43(5): 2015GL066970. March 2016.\n 00001\n\n\n\n
\n\n\n\n \n \n \"IsPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@article{lundin_is_2016,\n\ttitle = {Is the subarctic landscape still a carbon sink? {Evidence} from a detailed catchment balance},\n\tvolume = {43},\n\tissn = {1944-8007},\n\tshorttitle = {Is the subarctic landscape still a carbon sink?},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1002/2015GL066970/abstract},\n\tdoi = {10.1002/2015GL066970},\n\tabstract = {Climate warming raises the question whether high-latitude landscape still function as net carbon (C) sinks. By compiling an integrated C balance for an intensely studied subarctic catchment, we show that this catchment's C balance is not likely to be a strong current sink of C, a commonly held assumption. In fact, it is more plausible (71\\% probability) that the studied catchment functions as a C source (−11 ± 20 g C m−2 yr−1). Analyses of individual fluxes indicate that soil and aquatic C losses offset C sequestering in other landscape components (e.g., peatlands and aboveground forest biomass). Our results stress the importance of fully integrated catchment C balance estimates and highlight the importance of upland soils and their interaction with the aquatic network for the catchment C balance.},\n\tlanguage = {en},\n\tnumber = {5},\n\turldate = {2017-02-06},\n\tjournal = {Geophysical Research Letters},\n\tauthor = {Lundin, Erik J. and Klaminder, Jonatan and Giesler, Reiner and Persson, Andreas and Olefeldt, David and Heliasz, Michal and Christensen, Torben R. and Karlsson, Jan},\n\tmonth = mar,\n\tyear = {2016},\n\tnote = {00001},\n\tkeywords = {\\#nosource, 0428 Carbon cycling, aquatic ecosystems, carbon balance, carbon cycling, sink, source, subarctic, terrestrial ecosystems},\n\tpages = {2015GL066970},\n}\n\n\n\n
\n
\n\n\n
\n Climate warming raises the question whether high-latitude landscape still function as net carbon (C) sinks. By compiling an integrated C balance for an intensely studied subarctic catchment, we show that this catchment's C balance is not likely to be a strong current sink of C, a commonly held assumption. In fact, it is more plausible (71% probability) that the studied catchment functions as a C source (−11 ± 20 g C m−2 yr−1). Analyses of individual fluxes indicate that soil and aquatic C losses offset C sequestering in other landscape components (e.g., peatlands and aboveground forest biomass). Our results stress the importance of fully integrated catchment C balance estimates and highlight the importance of upland soils and their interaction with the aquatic network for the catchment C balance.\n
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\n \n\n \n \n \n \n \n \n GABAergic anxiolytic drug in water increases migration behaviour in salmon.\n \n \n \n \n\n\n \n Hellström, G.; Klaminder, J.; Finn, F.; Persson, L.; Alanärä, A.; Jonsson, M.; Fick, J.; and Brodin, T.\n\n\n \n\n\n\n Nature Communications, 7: 13460. December 2016.\n 00009\n\n\n\n
\n\n\n\n \n \n \"GABAergicPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{hellstrom_gabaergic_2016,\n\ttitle = {{GABAergic} anxiolytic drug in water increases migration behaviour in salmon},\n\tvolume = {7},\n\tcopyright = {© 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.},\n\tissn = {2041-1723},\n\turl = {http://www.nature.com/ncomms/2016/161206/ncomms13460/full/ncomms13460.html},\n\tdoi = {10.1038/ncomms13460},\n\tabstract = {Fish migration is influenced by various environmental factors such as chemicals in water. Here, Hellstrom et al. show that an anxiolytic drug in the benzodiazepine family, oxazepam, can promote migratory behaviour of Atlantic salmon smolts in both laboratory setting and river tributary in Sweden.},\n\tlanguage = {en},\n\turldate = {2016-12-11},\n\tjournal = {Nature Communications},\n\tauthor = {Hellström, Gustav and Klaminder, Jonatan and Finn, Fia and Persson, Lo and Alanärä, Anders and Jonsson, Micael and Fick, Jerker and Brodin, Tomas},\n\tmonth = dec,\n\tyear = {2016},\n\tnote = {00009},\n\tkeywords = {\\#nosource},\n\tpages = {13460},\n}\n\n\n\n
\n
\n\n\n
\n Fish migration is influenced by various environmental factors such as chemicals in water. Here, Hellstrom et al. show that an anxiolytic drug in the benzodiazepine family, oxazepam, can promote migratory behaviour of Atlantic salmon smolts in both laboratory setting and river tributary in Sweden.\n
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\n \n\n \n \n \n \n \n Upscaling behavioural studies to the field using acoustic telemetry.\n \n \n \n\n\n \n Hellström, G.; Klaminder, J.; Jonsson, M.; Fick, J.; and Brodin, T.\n\n\n \n\n\n\n Aquatic Toxicology (Amsterdam, Netherlands), 170: 384–389. January 2016.\n 00006 \n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@article{hellstrom_upscaling_2016,\n\ttitle = {Upscaling behavioural studies to the field using acoustic telemetry},\n\tvolume = {170},\n\tissn = {1879-1514},\n\tdoi = {10.1016/j.aquatox.2015.11.005},\n\tabstract = {Laboratory-based behavioural assays are often used in ecotoxicological studies to assess the environmental risk of aquatic contaminants. While results from such laboratory-based risk assessments may be difficult to extrapolate to natural environments, technological advancements over the past decade now make it possible to perform risk assessments through detailed studies of exposed individuals in natural settings. Acoustic telemetry is a technology to monitor movement and behaviour of aquatic organism in oceans, lakes, and rivers. The technology allows for tracking of multiple individuals simultaneously with very high temporal and spatial resolution, with the option to incorporate sensors to measure various physiological and environmental parameters. Although frequently used in fisheries research, aquatic ecotoxicology has been slow to adopt acoustic telemetry as a tool in field-based studies. This mini-review intends to introduce acoustic telemetry to aquatic ecotoxicologists, focusing on the potential of the technology to bridge the gap between laboratory assays and natural behaviours when making toxicological risk assessments.},\n\tlanguage = {eng},\n\tjournal = {Aquatic Toxicology (Amsterdam, Netherlands)},\n\tauthor = {Hellström, Gustav and Klaminder, Jonatan and Jonsson, Micael and Fick, Jerker and Brodin, Tomas},\n\tmonth = jan,\n\tyear = {2016},\n\tpmid = {26683267},\n\tnote = {00006 },\n\tkeywords = {\\#nosource, Acoustic telemetry, Animals, Aquatic Organisms, Aquatic ecotoxicology, Behavior, Animal, Biomarker, Biomarkers, Monitoring, Telemetry, Toxicity Tests, Water Pollutants, Chemical, behaviour},\n\tpages = {384--389},\n}\n\n\n\n
\n
\n\n\n
\n Laboratory-based behavioural assays are often used in ecotoxicological studies to assess the environmental risk of aquatic contaminants. While results from such laboratory-based risk assessments may be difficult to extrapolate to natural environments, technological advancements over the past decade now make it possible to perform risk assessments through detailed studies of exposed individuals in natural settings. Acoustic telemetry is a technology to monitor movement and behaviour of aquatic organism in oceans, lakes, and rivers. The technology allows for tracking of multiple individuals simultaneously with very high temporal and spatial resolution, with the option to incorporate sensors to measure various physiological and environmental parameters. Although frequently used in fisheries research, aquatic ecotoxicology has been slow to adopt acoustic telemetry as a tool in field-based studies. This mini-review intends to introduce acoustic telemetry to aquatic ecotoxicologists, focusing on the potential of the technology to bridge the gap between laboratory assays and natural behaviours when making toxicological risk assessments.\n
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\n \n\n \n \n \n \n \n \n Modeling the downward transport of 210Pb in Peatlands: Initial Penetration‐Constant Rate of Supply (IP-CRS) model.\n \n \n \n \n\n\n \n Olid, C.; Diego, D.; Garcia-Orellana, J.; Cortizas, A. M.; and Klaminder, J.\n\n\n \n\n\n\n Science of The Total Environment, 541: 1222–1231. January 2016.\n 00005\n\n\n\n
\n\n\n\n \n \n \"ModelingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@article{olid_modeling_2016,\n\ttitle = {Modeling the downward transport of {210Pb} in {Peatlands}: {Initial} {Penetration}‐{Constant} {Rate} of {Supply} ({IP}-{CRS}) model},\n\tvolume = {541},\n\tissn = {0048-9697},\n\tshorttitle = {Modeling the downward transport of {210Pb} in {Peatlands}},\n\turl = {http://www.sciencedirect.com/science/article/pii/S0048969715307920},\n\tdoi = {10.1016/j.scitotenv.2015.09.131},\n\tabstract = {The vertical distribution of 210Pb is commonly used to date peat deposits accumulated over the last 100–150 years. However, several studies have questioned this method because of an apparent post-depositional mobility of 210Pb within some peat profiles. In this study, we introduce the Initial Penetration–Constant Rate of Supply (IP-CRS) model for calculating ages derived from 210Pb profiles that are altered by an initial migration of the radionuclide. This new, two-phased, model describes the distribution of atmospheric-derived 210Pb (210Pbxs) in peat taking into account both incorporation of 210Pb into the accumulating peat matrix as well as an initial flushing of 210Pb through the uppermost peat layers. The validity of the IP-CRS model is tested in four anomalous 210Pb peat records that showed some deviations from the typical exponential decay profile not explained by variations in peat accumulation rates. Unlike the most commonly used 210Pb-dating model (Constant Rate of Supply (CRS)), the IP-CRS model estimates peat accumulation rates consistent with typical growth rates for peatlands from the same areas. Confidence in the IP-CRS chronology is also provided by the good agreement with independent chronological markers (i.e. 241Am and 137Cs). Our results showed that the IP-CRS can provide chronologies from peat records where 210Pb mobility is evident, being a valuable tool for studies reconstructing past environmental changes using peat archives during the Anthropocene.},\n\turldate = {2017-04-28},\n\tjournal = {Science of The Total Environment},\n\tauthor = {Olid, Carolina and Diego, David and Garcia-Orellana, Jordi and Cortizas, Antonio Martínez and Klaminder, Jonatan},\n\tmonth = jan,\n\tyear = {2016},\n\tnote = {00005},\n\tkeywords = {\\#nosource, 137Cs, 210Pb, 241Am, Americium, Caesium, Chronology, Lead},\n\tpages = {1222--1231},\n}\n\n\n\n
\n
\n\n\n
\n The vertical distribution of 210Pb is commonly used to date peat deposits accumulated over the last 100–150 years. However, several studies have questioned this method because of an apparent post-depositional mobility of 210Pb within some peat profiles. In this study, we introduce the Initial Penetration–Constant Rate of Supply (IP-CRS) model for calculating ages derived from 210Pb profiles that are altered by an initial migration of the radionuclide. This new, two-phased, model describes the distribution of atmospheric-derived 210Pb (210Pbxs) in peat taking into account both incorporation of 210Pb into the accumulating peat matrix as well as an initial flushing of 210Pb through the uppermost peat layers. The validity of the IP-CRS model is tested in four anomalous 210Pb peat records that showed some deviations from the typical exponential decay profile not explained by variations in peat accumulation rates. Unlike the most commonly used 210Pb-dating model (Constant Rate of Supply (CRS)), the IP-CRS model estimates peat accumulation rates consistent with typical growth rates for peatlands from the same areas. Confidence in the IP-CRS chronology is also provided by the good agreement with independent chronological markers (i.e. 241Am and 137Cs). Our results showed that the IP-CRS can provide chronologies from peat records where 210Pb mobility is evident, being a valuable tool for studies reconstructing past environmental changes using peat archives during the Anthropocene.\n
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\n  \n 2015\n \n \n (5)\n \n \n
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\n \n\n \n \n \n \n \n \n Thermal Stability of Goethite-Bound Natural Organic Matter Is Impacted by Carbon Loading.\n \n \n \n \n\n\n \n Feng, W.; Klaminder, J.; and Boily, J.\n\n\n \n\n\n\n The Journal of Physical Chemistry A, 119(51): 12790–12796. December 2015.\n Publisher: American Chemical Society\n\n\n\n
\n\n\n\n \n \n \"ThermalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
\n
@article{feng_thermal_2015,\n\ttitle = {Thermal {Stability} of {Goethite}-{Bound} {Natural} {Organic} {Matter} {Is} {Impacted} by {Carbon} {Loading}},\n\tvolume = {119},\n\tissn = {1089-5639},\n\turl = {https://doi.org/10.1021/acs.jpca.5b09821},\n\tdoi = {10.1021/acs.jpca.5b09821},\n\tabstract = {Dissolved natural organic matter (NOM) sorption at mineral surfaces can significantly affect the persistence of organic carbon in soils and sediments. Consequently, determining the mechanisms that stabilize sorbed NOM is crucial for predicting the persistence of carbon in nature. This study determined the effects of loadings and pH on the thermal stability of NOM associated with synthetic goethite (α-FeOOH) particle surfaces, as a proxy for NOM–mineral interactions taking place in nature. NOM thermal stability was investigated using temperature-programmed desorption (TPD) in the 30–700 °C range to collect vibration spectra of thermally decomposing goethite–NOM assemblages, and to concomitantly analyze evolved gases using mass spectrometry. Results showed that NOM thermal stability, indicated by the range of temperatures in which CO2 evolved during thermal decomposition, was greatest in unbound NOM and lowest when NOM was bound to goethite. NOM thermal stability was also loading dependent. It decreased when loadings were in increased the 0.01 to 0.42 mg C m−2 range, where the upper value corresponds to a Langmuirian adsorption maximum. Concomitant Fourier transform infrared (FTIR) spectroscopy measurement showed that these lowered stabilities could be ascribed to direct NOM-goethite interactions that dominated the NOM binding environment. Mineral surface interactions at larger loadings involved, on the contrary, a smaller fraction of the sorbed NOM, thus increasing thermal stability toward that of its unbound counterpart. This study thus identifies a sorption threshold below which NOM sorption to goethite decreases NOM thermal stability, and above which no strong effects are manifested. This should likely influence the fate of organic carbon exposed to thermal gradients in natural environments.},\n\tnumber = {51},\n\turldate = {2024-03-26},\n\tjournal = {The Journal of Physical Chemistry A},\n\tauthor = {Feng, Wenting and Klaminder, Jonatan and Boily, Jean-François},\n\tmonth = dec,\n\tyear = {2015},\n\tnote = {Publisher: American Chemical Society},\n\tkeywords = {\\#nosource},\n\tpages = {12790--12796},\n}\n\n\n\n
\n
\n\n\n
\n Dissolved natural organic matter (NOM) sorption at mineral surfaces can significantly affect the persistence of organic carbon in soils and sediments. Consequently, determining the mechanisms that stabilize sorbed NOM is crucial for predicting the persistence of carbon in nature. This study determined the effects of loadings and pH on the thermal stability of NOM associated with synthetic goethite (α-FeOOH) particle surfaces, as a proxy for NOM–mineral interactions taking place in nature. NOM thermal stability was investigated using temperature-programmed desorption (TPD) in the 30–700 °C range to collect vibration spectra of thermally decomposing goethite–NOM assemblages, and to concomitantly analyze evolved gases using mass spectrometry. Results showed that NOM thermal stability, indicated by the range of temperatures in which CO2 evolved during thermal decomposition, was greatest in unbound NOM and lowest when NOM was bound to goethite. NOM thermal stability was also loading dependent. It decreased when loadings were in increased the 0.01 to 0.42 mg C m−2 range, where the upper value corresponds to a Langmuirian adsorption maximum. Concomitant Fourier transform infrared (FTIR) spectroscopy measurement showed that these lowered stabilities could be ascribed to direct NOM-goethite interactions that dominated the NOM binding environment. Mineral surface interactions at larger loadings involved, on the contrary, a smaller fraction of the sorbed NOM, thus increasing thermal stability toward that of its unbound counterpart. This study thus identifies a sorption threshold below which NOM sorption to goethite decreases NOM thermal stability, and above which no strong effects are manifested. This should likely influence the fate of organic carbon exposed to thermal gradients in natural environments.\n
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\n \n\n \n \n \n \n \n Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland.\n \n \n \n\n\n \n Becher, M.; Olofsson, J.; and Klaminder, J.\n\n\n \n\n\n\n Environmental Research Letters, 10(11): 114006. November 2015.\n 00002\n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{becher_cryogenic_2015,\n\ttitle = {Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland},\n\tvolume = {10},\n\tissn = {1748-9326},\n\tdoi = {2020031315140592},\n\tabstract = {Differential frost heave, along with the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP), soil respiration (Re) and the resulting net ecosystem exchange (NEE) vary in a patterned ground system (non-sorted circles) at plot-scale and whole-patterned ground scales in response to cryogenic disturbances (differential heave and soil surface disruption). We found that: (i) all studied non-sorted circles (n = 15) acted as net CO2 sources (positive NEE); (ii) GEP showed a weaker decrease than Re in response to increased cryogenic disturbance/decreased humus cover, indicating that undisturbed humus-covered sites are currently the main source of atmospheric CO2 in the studied system. Interestingly, Re fluxes normalized to Cpools indicated that C is currently respired more rapidly at sites exposed to cryogenic disturbances; hence, higher NEE fluxes at less disturbed sites are likely an effect of a more slowly degrading but larger total pool that was built up in the past. Our results highlight the complex effects of cryogenic processes on the Ccycle at various time scales.},\n\tlanguage = {English},\n\tnumber = {11},\n\tjournal = {Environmental Research Letters},\n\tauthor = {Becher, Marina and Olofsson, Johan and Klaminder, Jonatan},\n\tmonth = nov,\n\tyear = {2015},\n\tnote = {00002},\n\tkeywords = {\\#nosource, CO2, Sweden, age, alaska, climate-change, nonsorted circles, organic-carbon, permafrost-affected soils, tundra, vegetation, ⚠️ Invalid DOI},\n\tpages = {114006},\n}\n\n\n\n
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\n\n\n
\n Differential frost heave, along with the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP), soil respiration (Re) and the resulting net ecosystem exchange (NEE) vary in a patterned ground system (non-sorted circles) at plot-scale and whole-patterned ground scales in response to cryogenic disturbances (differential heave and soil surface disruption). We found that: (i) all studied non-sorted circles (n = 15) acted as net CO2 sources (positive NEE); (ii) GEP showed a weaker decrease than Re in response to increased cryogenic disturbance/decreased humus cover, indicating that undisturbed humus-covered sites are currently the main source of atmospheric CO2 in the studied system. Interestingly, Re fluxes normalized to Cpools indicated that C is currently respired more rapidly at sites exposed to cryogenic disturbances; hence, higher NEE fluxes at less disturbed sites are likely an effect of a more slowly degrading but larger total pool that was built up in the past. Our results highlight the complex effects of cryogenic processes on the Ccycle at various time scales.\n
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\n \n\n \n \n \n \n \n Size and characteristics of the DOC pool in near-surface subarctic mire permafrost as a potential source for nearby freshwaters.\n \n \n \n\n\n \n Thompson, M. S.; Giesler, R.; Karlsson, J.; and Klaminder, J.\n\n\n \n\n\n\n Arctic Antarctic and Alpine Research, 47(1): 49–58. February 2015.\n 00000\n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{thompson_size_2015,\n\ttitle = {Size and characteristics of the {DOC} pool in near-surface subarctic mire permafrost as a potential source for nearby freshwaters},\n\tvolume = {47},\n\tissn = {1523-0430},\n\tdoi = {10.1657/AAAR0014-010},\n\tabstract = {Subarctic peatlands are rich sources of organic carbon for freshwater ecosystems. Where those peatlands are underlain by permafrost, permafrost thaw may cause an initial release of bioavailable dissolved organic carbon (DOC) to surrounding freshwaters. In this study, we measured icebound and potentially leachable (extracted) DOC quantities and indices of DOC quality in active layer and permafrost layers from two subarctic peat mires, Stord-alen and Storflaket. Most of the permafrost layers did not contain more organic matter or exportable DOC (as g kg(-1) dry soil) than the overlying active layer, and there was no difference in aromaticity, molecular weight, or the ratio between labile and recalcitrant DOC extracted from the permafrost and active layer. However, DOC held in segregated ice of the near-surface permafrost had relatively low aromaticity compared to extracted DOC from the same depth. Total icebound and potentially leachable DOC in the Stordalen mire permafrost that is predicted to experience active layer deepening during each of the next 50 years corresponded to about 0.1\\% of the current annual aquatic export of DOC from the mire. We conclude that the pool of potentially leachable DOC currently stored in permafrost layers is small. We also highlight differences in permafrost organic material between the two studied mire systems, which has an effect on the pool and properties of leachable DOC that is potentially available for export during thaw. Moreover, the geomorphological form of permafrost thaw will influence future hydrological connectedness and DOC production, in turn determining future DOC export from the mires.},\n\tlanguage = {English},\n\tnumber = {1},\n\tjournal = {Arctic Antarctic and Alpine Research},\n\tauthor = {Thompson, M. S. and Giesler, R. and Karlsson, J. and Klaminder, J.},\n\tmonth = feb,\n\tyear = {2015},\n\tnote = {00000},\n\tkeywords = {\\#nosource, Biogeochemistry, canada, carbon, climate-change, dissolved organic-matter, ground   ice, indicators, northwest-territories, soils, streams},\n\tpages = {49--58},\n}\n\n\n\n
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\n\n\n
\n Subarctic peatlands are rich sources of organic carbon for freshwater ecosystems. Where those peatlands are underlain by permafrost, permafrost thaw may cause an initial release of bioavailable dissolved organic carbon (DOC) to surrounding freshwaters. In this study, we measured icebound and potentially leachable (extracted) DOC quantities and indices of DOC quality in active layer and permafrost layers from two subarctic peat mires, Stord-alen and Storflaket. Most of the permafrost layers did not contain more organic matter or exportable DOC (as g kg(-1) dry soil) than the overlying active layer, and there was no difference in aromaticity, molecular weight, or the ratio between labile and recalcitrant DOC extracted from the permafrost and active layer. However, DOC held in segregated ice of the near-surface permafrost had relatively low aromaticity compared to extracted DOC from the same depth. Total icebound and potentially leachable DOC in the Stordalen mire permafrost that is predicted to experience active layer deepening during each of the next 50 years corresponded to about 0.1% of the current annual aquatic export of DOC from the mire. We conclude that the pool of potentially leachable DOC currently stored in permafrost layers is small. We also highlight differences in permafrost organic material between the two studied mire systems, which has an effect on the pool and properties of leachable DOC that is potentially available for export during thaw. Moreover, the geomorphological form of permafrost thaw will influence future hydrological connectedness and DOC production, in turn determining future DOC export from the mires.\n
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\n \n\n \n \n \n \n \n Large difference in carbon emission - burial balances between boreal and arctic lakes.\n \n \n \n\n\n \n Lundin, E. J.; Klaminder, J.; Bastviken, D.; Olid, C.; Hansson, S. V.; and Karlsson, J.\n\n\n \n\n\n\n Scientific Reports, 5(5): 14248. 2015.\n 00005\n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{lundin_large_2015,\n\ttitle = {Large difference in carbon emission - burial balances between boreal and arctic lakes},\n\tvolume = {5},\n\tissn = {2045-2322},\n\tdoi = {10.1038/srep14248},\n\tabstract = {Lakes play an important role in the global carbon (C) cycle by burying C in sediments and emitting CO2 and CH4 to the atmosphere. The strengths and control of these fundamentally different pathways are therefore of interest when assessing the continental C balance and its response to environmental change. In this study, based on new high-resolution estimates in combination with literature data, we show that annual emission: burial ratios are generally ten times higher in boreal compared to subarctic - arctic lakes. These results suggest major differences in lake C cycling between biomes, as lakes in warmer boreal regions emit more and store relatively less C than lakes in colder arctic regions. Such effects are of major importance for understanding climatic feedbacks on the continental C sink - source function at high latitudes. If predictions of global warming and northward expansion of the boreal biome are correct, it is likely that increasing C emissions from high latitude lakes will partly counteract the presumed increasing terrestrial C sink capacity at high latitudes.},\n\tlanguage = {English},\n\tnumber = {5},\n\tjournal = {Scientific Reports},\n\tauthor = {Lundin, E. J. and Klaminder, J. and Bastviken, D. and Olid, C. and Hansson, S. V. and Karlsson, J.},\n\tyear = {2015},\n\tnote = {00005},\n\tkeywords = {\\#nosource, Ecosystems, Mineralization, atmosphere, deposition, dioxide, limitation, organic-carbon, sediments, soils, vegetation},\n\tpages = {14248},\n}\n\n\n\n
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\n Lakes play an important role in the global carbon (C) cycle by burying C in sediments and emitting CO2 and CH4 to the atmosphere. The strengths and control of these fundamentally different pathways are therefore of interest when assessing the continental C balance and its response to environmental change. In this study, based on new high-resolution estimates in combination with literature data, we show that annual emission: burial ratios are generally ten times higher in boreal compared to subarctic - arctic lakes. These results suggest major differences in lake C cycling between biomes, as lakes in warmer boreal regions emit more and store relatively less C than lakes in colder arctic regions. Such effects are of major importance for understanding climatic feedbacks on the continental C sink - source function at high latitudes. If predictions of global warming and northward expansion of the boreal biome are correct, it is likely that increasing C emissions from high latitude lakes will partly counteract the presumed increasing terrestrial C sink capacity at high latitudes.\n
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\n \n\n \n \n \n \n \n Sources of and processes controlling CO2 emissions change with the size of streams and rivers.\n \n \n \n\n\n \n Hotchkiss, E. R.; Hall, R. O.; Sponseller, R. A.; Butman, D.; Klaminder, J.; Laudon, H.; Rosvall, M.; and Karlsson, J.\n\n\n \n\n\n\n Nature Geoscience, 8(9): 696–+. September 2015.\n \n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{hotchkiss_sources_2015,\n\ttitle = {Sources of and processes controlling {CO2} emissions change with the size of streams and rivers},\n\tvolume = {8},\n\tissn = {1752-0894},\n\tdoi = {10.1038/NGEO2507},\n\tabstract = {Carbon dioxide (CO2) evasion from streams and rivers to the atmosphere represents a substantial flux in the global carbon cycle(1-3). The proportions of CO2 emitted from streams and rivers that come from terrestrially derived CO2 or from CO2 produced within freshwater ecosystems through aquatic metabolism are not well quantified. Here we estimated CO2 emissions from running waters in the contiguous United States, based on freshwater chemical and physical characteristics and modelled gas transfer velocities at 1463 United States Geological Survey monitoring sites. We then assessed CO2 production from aquatic metabolism, compiled from previously published measurements of net ecosystem production from 187 streams and rivers across the contiguous United States. We find that CO2 produced by aquatic metabolism contributes about 28\\% of CO2 evasion from streams and rivers with flows between 0.0001 and 19,000 m(3) s(-1). We mathematically modelled CO2 flux from groundwater into running waters along a stream-river continuum to evaluate the relationship between stream size and CO2 source. Terrestrially derived CO2 dominates emissions from small streams, and the percentage of CO2 emissions from aquatic metabolism increases with stream size. We suggest that the relative role of rivers as conduits for terrestrial CO2 efflux and as reactors mineralizing terrestrial organic carbon is a function of their size and connectivity with landscapes.},\n\tlanguage = {English},\n\tnumber = {9},\n\tjournal = {Nature Geoscience},\n\tauthor = {Hotchkiss, E. R. and Hall, R. O. and Sponseller, R. A. and Butman, D. and Klaminder, J. and Laudon, H. and Rosvall, M. and Karlsson, J.},\n\tmonth = sep,\n\tyear = {2015},\n\tkeywords = {\\#nosource, aquatic ecosystems, budget, carbon-dioxide, cycle, inland waters, metabolism, temporal variability, united-states},\n\tpages = {696--+},\n}\n\n\n\n
\n
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\n Carbon dioxide (CO2) evasion from streams and rivers to the atmosphere represents a substantial flux in the global carbon cycle(1-3). The proportions of CO2 emitted from streams and rivers that come from terrestrially derived CO2 or from CO2 produced within freshwater ecosystems through aquatic metabolism are not well quantified. Here we estimated CO2 emissions from running waters in the contiguous United States, based on freshwater chemical and physical characteristics and modelled gas transfer velocities at 1463 United States Geological Survey monitoring sites. We then assessed CO2 production from aquatic metabolism, compiled from previously published measurements of net ecosystem production from 187 streams and rivers across the contiguous United States. We find that CO2 produced by aquatic metabolism contributes about 28% of CO2 evasion from streams and rivers with flows between 0.0001 and 19,000 m(3) s(-1). We mathematically modelled CO2 flux from groundwater into running waters along a stream-river continuum to evaluate the relationship between stream size and CO2 source. Terrestrially derived CO2 dominates emissions from small streams, and the percentage of CO2 emissions from aquatic metabolism increases with stream size. We suggest that the relative role of rivers as conduits for terrestrial CO2 efflux and as reactors mineralizing terrestrial organic carbon is a function of their size and connectivity with landscapes.\n
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\n  \n 2014\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n The effects of temperature and nitrogen and sulfur additions on carbon accumulation in a nutrient-poor boreal mire: Decadal effects assessed using 210Pb peat chronologies.\n \n \n \n \n\n\n \n Olid, C.; Nilsson, M. B.; Eriksson, T.; and Klaminder, J.\n\n\n \n\n\n\n Journal of Geophysical Research: Biogeosciences, 119(3): 2013JG002365. March 2014.\n 00008\n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{olid_effects_2014,\n\ttitle = {The effects of temperature and nitrogen and sulfur additions on carbon accumulation in a nutrient-poor boreal mire: {Decadal} effects assessed using {210Pb} peat chronologies},\n\tvolume = {119},\n\tissn = {2169-8961},\n\tshorttitle = {The effects of temperature and nitrogen and sulfur additions on carbon accumulation in a nutrient-poor boreal mire},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1002/2013JG002365/abstract},\n\tdoi = {10.1002/2013JG002365},\n\tabstract = {Boreal peatlands are a major long-term reservoir of atmospheric carbon (C) and play an important role in the global C cycle. It is unclear how C accumulation in peatlands responds to changing temperatures and nutrients (specifically, nitrogen and sulfur). In this study, we assessed how the C input rate and C accumulation rate in decadal old peat layers respond to increased air temperatures (+3.6°C) during the growing season and the annual additions of nitrogen (N) and sulfur (S) (30 and 20 kg ha−1 yr−1, respectively) over 12 years of field treatments in a boreal mire. An empirical mass balance model was applied to 210Pb-dated peat cores to evaluate changes in C inputs, C mass loss, and net C accumulation rates in response to the treatments. We found that (i) none of the treatments generated a significant effect on peat mass loss decay rates, (ii) C input rates were positively affected by N additions and negatively affected by S additions, (iii) the C accumulation rate in the uppermost (10 to 12 cm) peat was increased by N additions and decreased by S additions, and (iv) only air temperature significantly affected the main effects induced by N and S additions. Based on our findings, we argue that C accumulation rates in surface peat layers of nutrient-poor boreal mires can increase despite the predicted rise in air temperatures as long as N loads increase and acid atmospheric S remains low.},\n\tlanguage = {en},\n\tnumber = {3},\n\turldate = {2017-04-28},\n\tjournal = {Journal of Geophysical Research: Biogeosciences},\n\tauthor = {Olid, Carolina and Nilsson, Mats B. and Eriksson, Tobias and Klaminder, Jonatan},\n\tmonth = mar,\n\tyear = {2014},\n\tnote = {00008},\n\tkeywords = {\\#nosource, 0414 Biogeochemical cycles, processes, and modeling, 0428 Carbon cycling, 0497 Wetlands, 1115 Radioisotope geochronology, 1630 Impacts of global change, 210Pb, Mire, Nitrogen, carbon, climate change, temperature},\n\tpages = {2013JG002365},\n}\n\n\n\n
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\n Boreal peatlands are a major long-term reservoir of atmospheric carbon (C) and play an important role in the global C cycle. It is unclear how C accumulation in peatlands responds to changing temperatures and nutrients (specifically, nitrogen and sulfur). In this study, we assessed how the C input rate and C accumulation rate in decadal old peat layers respond to increased air temperatures (+3.6°C) during the growing season and the annual additions of nitrogen (N) and sulfur (S) (30 and 20 kg ha−1 yr−1, respectively) over 12 years of field treatments in a boreal mire. An empirical mass balance model was applied to 210Pb-dated peat cores to evaluate changes in C inputs, C mass loss, and net C accumulation rates in response to the treatments. We found that (i) none of the treatments generated a significant effect on peat mass loss decay rates, (ii) C input rates were positively affected by N additions and negatively affected by S additions, (iii) the C accumulation rate in the uppermost (10 to 12 cm) peat was increased by N additions and decreased by S additions, and (iv) only air temperature significantly affected the main effects induced by N and S additions. Based on our findings, we argue that C accumulation rates in surface peat layers of nutrient-poor boreal mires can increase despite the predicted rise in air temperatures as long as N loads increase and acid atmospheric S remains low.\n
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\n \n\n \n \n \n \n \n \n High-throughput sequencing shows inconsistent results with a microscope-based analysis of the soil prokaryotic community.\n \n \n \n \n\n\n \n Ushio, M.; Makoto, K.; Klaminder, J.; Takasu, H.; and Nakano, S.\n\n\n \n\n\n\n Soil Biology and Biochemistry, 76: 53–56. September 2014.\n 00008\n\n\n\n
\n\n\n\n \n \n \"High-throughputPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{ushio_high-throughput_2014,\n\ttitle = {High-throughput sequencing shows inconsistent results with a microscope-based analysis of the soil prokaryotic community},\n\tvolume = {76},\n\tissn = {0038-0717},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0038071714001709},\n\tdoi = {10.1016/j.soilbio.2014.05.010},\n\tabstract = {In the present study, we perform the first direct analysis on how the composition of the prokaryotic soil community differs depending on whether high-throughput sequencing or fluorescent in situ hybridization (FISH) coupled with catalyzed reporter deposition (CARD) is used. Soil samples were collected along short (\\&lt;3 m) tundra vegetation gradients from Northern Sweden. Relative abundances of Acidobacteria and Bacteroidetes estimated by the high-throughput sequencing were higher than those estimated by CARD–FISH, while relative abundances of Archaea and α-Proteobacteria estimated by high-throughput sequencing were lower than those estimated by CARD–FISH. The results indicated that the high-throughput sequencing overestimates/underestimates the relative abundance of some microbial taxa if we assume that CARD–FISH can provide potentially more quantitative data. Great caution should be taken when interpreting data generated by molecular technologies (both of high-throughput sequencing and CARD–FISH), and supports by multiple approaches are necessary to make a robust conclusion.},\n\turldate = {2017-02-07},\n\tjournal = {Soil Biology and Biochemistry},\n\tauthor = {Ushio, Masayuki and Makoto, Kobayashi and Klaminder, Jonatan and Takasu, Hiroyuki and Nakano, Shin-ichi},\n\tmonth = sep,\n\tyear = {2014},\n\tnote = {00008},\n\tkeywords = {\\#nosource, Archaea, CARD–FISH, High-throughput sequencing, Soil prokaryotic community, Tundra ecosystem, bacteria},\n\tpages = {53--56},\n}\n\n\n\n
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\n In the present study, we perform the first direct analysis on how the composition of the prokaryotic soil community differs depending on whether high-throughput sequencing or fluorescent in situ hybridization (FISH) coupled with catalyzed reporter deposition (CARD) is used. Soil samples were collected along short (<3 m) tundra vegetation gradients from Northern Sweden. Relative abundances of Acidobacteria and Bacteroidetes estimated by the high-throughput sequencing were higher than those estimated by CARD–FISH, while relative abundances of Archaea and α-Proteobacteria estimated by high-throughput sequencing were lower than those estimated by CARD–FISH. The results indicated that the high-throughput sequencing overestimates/underestimates the relative abundance of some microbial taxa if we assume that CARD–FISH can provide potentially more quantitative data. Great caution should be taken when interpreting data generated by molecular technologies (both of high-throughput sequencing and CARD–FISH), and supports by multiple approaches are necessary to make a robust conclusion.\n
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\n \n\n \n \n \n \n \n \n Using Short-lived Radionuclides to Estimate Rates of Soil Motion in Frost Boils.\n \n \n \n \n\n\n \n Klaminder, J.; Yoo, K.; Olid, C.; Ramebäck, H.; and Vesterlund, A.\n\n\n \n\n\n\n Permafrost and Periglacial Processes, 25(3): 184–193. July 2014.\n 00005\n\n\n\n
\n\n\n\n \n \n \"UsingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_using_2014,\n\ttitle = {Using {Short}-lived {Radionuclides} to {Estimate} {Rates} of {Soil} {Motion} in {Frost} {Boils}},\n\tvolume = {25},\n\tissn = {1099-1530},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1002/ppp.1811/abstract},\n\tdoi = {10.1002/ppp.1811},\n\tabstract = {Cryoturbation in high-latitude soils is crucial for the long-term cycling of elements, but the rates of soil motion are poorly constrained. Here, we test whether the rate of frost creep, soil erosion and vertical soil mixing in frost boils can be estimated using short-lived radionuclides (137Cs and 210Pb). We find a small-scale variation in 137Cs and 210Pb inventories in the lower levels of the eroding regions of frost boils in comparison to the expected depositional sites; hence, the distribution of the radionuclides appears to reflect a lateral transport of atmospheric fallout from the centre of the boil (inner domain) towards the surrounding soil (outer domain). 14C dating of the soil indicates that fallout of 137Cs was mobile in the soil and that 210Pb moved with the soil matrix. A soil creep model and a surface soil erosion model are derived and applied to the lateral and vertical distributions of 210Pb in the frost boil. Both models predict the expected trajectories of soil motion and provide rates of creep, erosion and mixing at a mm yr−1 to cm yr−1 scale. The distribution of 210Pb provides new insights about the processes and rates of soil mass movement in frost boils, if sound mass-balance models are applied. Copyright © 2014 John Wiley \\& Sons, Ltd.},\n\tlanguage = {en},\n\tnumber = {3},\n\turldate = {2017-02-07},\n\tjournal = {Permafrost and Periglacial Processes},\n\tauthor = {Klaminder, J. and Yoo, K. and Olid, C. and Ramebäck, H. and Vesterlund, A.},\n\tmonth = jul,\n\tyear = {2014},\n\tnote = {00005},\n\tkeywords = {\\#nosource, Cryoturbation, carbon-14, cesium-137, frost boils, lead-210},\n\tpages = {184--193},\n}\n\n\n\n
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\n Cryoturbation in high-latitude soils is crucial for the long-term cycling of elements, but the rates of soil motion are poorly constrained. Here, we test whether the rate of frost creep, soil erosion and vertical soil mixing in frost boils can be estimated using short-lived radionuclides (137Cs and 210Pb). We find a small-scale variation in 137Cs and 210Pb inventories in the lower levels of the eroding regions of frost boils in comparison to the expected depositional sites; hence, the distribution of the radionuclides appears to reflect a lateral transport of atmospheric fallout from the centre of the boil (inner domain) towards the surrounding soil (outer domain). 14C dating of the soil indicates that fallout of 137Cs was mobile in the soil and that 210Pb moved with the soil matrix. A soil creep model and a surface soil erosion model are derived and applied to the lateral and vertical distributions of 210Pb in the frost boil. Both models predict the expected trajectories of soil motion and provide rates of creep, erosion and mixing at a mm yr−1 to cm yr−1 scale. The distribution of 210Pb provides new insights about the processes and rates of soil mass movement in frost boils, if sound mass-balance models are applied. Copyright © 2014 John Wiley & Sons, Ltd.\n
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\n  \n 2013\n \n \n (4)\n \n \n
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\n \n\n \n \n \n \n \n \n Cryogenic Soil Activity along Bioclimatic Gradients in Northern Sweden: Insights from Eight Different Proxies.\n \n \n \n \n\n\n \n Klaus, M.; Becher, M.; and Klaminder, J.\n\n\n \n\n\n\n Permafrost and Periglacial Processes, 24(3): 210–223. July 2013.\n 00013\n\n\n\n
\n\n\n\n \n \n \"CryogenicPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaus_cryogenic_2013,\n\ttitle = {Cryogenic {Soil} {Activity} along {Bioclimatic} {Gradients} in {Northern} {Sweden}: {Insights} from {Eight} {Different} {Proxies}},\n\tvolume = {24},\n\tissn = {1099-1530},\n\tshorttitle = {Cryogenic {Soil} {Activity} along {Bioclimatic} {Gradients} in {Northern} {Sweden}},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1002/ppp.1778/abstract},\n\tdoi = {10.1002/ppp.1778},\n\tabstract = {Cryogenic soil activity caused by differential soil movements during freeze-thaw cycles is of fundamental importance for Arctic ecosystem functioning, but its response to climate warming is uncertain. Eight proxies of cryogenic soil activity (including measurements of soil surface motion, vegetation and grey values of aerial photographs) were examined at eight study sites where non-sorted patterned ground spans an elevation gradient (400–1150 m asl) and a precipitation gradient (300–1000 mm yr-1) near Abisko, northern Sweden. Six proxies were significantly correlated with each other (mean {\\textbar}r{\\textbar} = 0.5). Soil surface motion increased by three to five times along the precipitation gradient and was two to four times greater at intermediate elevations than at low and high elevations, a pattern reflected by vegetation assemblages. The results suggest that inferences about how cryogenic soil activity changes with climate are independent of the choice of the proxy, although some proxies should be applied carefully. Four preferred proxies indicate that cryogenic soil activity may respond differently to climate warming along the elevation gradient and could be greatly modified by precipitation. This underlines the strong but spatially complex response of cryogenic processes to climate change in the Arctic. Copyright © 2013 John Wiley \\& Sons, Ltd.},\n\tlanguage = {en},\n\tnumber = {3},\n\turldate = {2017-02-07},\n\tjournal = {Permafrost and Periglacial Processes},\n\tauthor = {Klaus, Marcus and Becher, Marina and Klaminder, Jonatan},\n\tmonth = jul,\n\tyear = {2013},\n\tnote = {00013},\n\tkeywords = {\\#nosource, Cryoturbation, climosequence, cryoturbation, differential frost heave, non-sorted circle, periglacial geomorphology, soil disturbance},\n\tpages = {210--223},\n}\n\n\n\n
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\n Cryogenic soil activity caused by differential soil movements during freeze-thaw cycles is of fundamental importance for Arctic ecosystem functioning, but its response to climate warming is uncertain. Eight proxies of cryogenic soil activity (including measurements of soil surface motion, vegetation and grey values of aerial photographs) were examined at eight study sites where non-sorted patterned ground spans an elevation gradient (400–1150 m asl) and a precipitation gradient (300–1000 mm yr-1) near Abisko, northern Sweden. Six proxies were significantly correlated with each other (mean \\textbarr\\textbar = 0.5). Soil surface motion increased by three to five times along the precipitation gradient and was two to four times greater at intermediate elevations than at low and high elevations, a pattern reflected by vegetation assemblages. The results suggest that inferences about how cryogenic soil activity changes with climate are independent of the choice of the proxy, although some proxies should be applied carefully. Four preferred proxies indicate that cryogenic soil activity may respond differently to climate warming along the elevation gradient and could be greatly modified by precipitation. This underlines the strong but spatially complex response of cryogenic processes to climate change in the Arctic. Copyright © 2013 John Wiley & Sons, Ltd.\n
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\n \n\n \n \n \n \n \n \n Buried soil organic inclusions in non-sorted circles fields in northern Sweden: Age and Paleoclimatic context.\n \n \n \n \n\n\n \n Becher, M.; Olid, C.; and Klaminder, J.\n\n\n \n\n\n\n Journal of Geophysical Research: Biogeosciences, 118(1): 104–111. March 2013.\n 00012\n\n\n\n
\n\n\n\n \n \n \"BuriedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{becher_buried_2013,\n\ttitle = {Buried soil organic inclusions in non-sorted circles fields in northern {Sweden}: {Age} and {Paleoclimatic} context},\n\tvolume = {118},\n\tissn = {2169-8961},\n\tshorttitle = {Buried soil organic inclusions in non-sorted circles fields in northern {Sweden}},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1002/jgrg.20016/abstract},\n\tdoi = {10.1002/jgrg.20016},\n\tabstract = {Although burial of surface organic soil horizons into deeper mineral soil layers helps drive the long-term buildup of carbon in arctic soils, when and why buried horizons formed as result of cryoturbation in northern Sweden remain unclear. In this study, we used 14C and 210Pb dating to assess when organic matter was buried within non-sorted circles fields near Abisko in northern Sweden. In addition, we used aerial photos from 1959 and 2008 to detect eventual trends in cryogenic activities during this period. We found that organic matter from former organic horizons (stratigraphically intact or partly fragmented) corresponds to three major periods: 0–100 A.D., 900–1250 A.D., and 1650–1950 A.D. The latter two periods were indicated by several dated samples, while the extent of the oldest period is more uncertainty (indicated by only one sample). The aerial photos suggest a net overgrowth by shrub vegetation of previously exposed mineral soil surfaces since 1959. This overgrowth trend was seen in most of the studied fields (92 out of 137 analyzed fields), indicating that the cryogenic activity has mainly decreased in studied non-sorted circles fields since the 1950s. This latter interpretation is also supported by the absence of buried organic layers formed during the last decades. We suggest that the organic matter was buried during the transition from longer cold periods to warmer conditions. We believe these climatic shifts could have triggered regional scale burial of soil organic matter and thus affected how these soils sequestered carbon.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2017-02-07},\n\tjournal = {Journal of Geophysical Research: Biogeosciences},\n\tauthor = {Becher, Marina and Olid, Carolina and Klaminder, Jonatan},\n\tmonth = mar,\n\tyear = {2013},\n\tnote = {00012},\n\tkeywords = {\\#nosource, Arctic, Image processing, Pb-210, Permafrost, cryosphere, and high-latitude processes, Soil, carbon cycling, frost creep, non-sorted circles, radiocarbon},\n\tpages = {104--111},\n}\n\n\n\n
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\n Although burial of surface organic soil horizons into deeper mineral soil layers helps drive the long-term buildup of carbon in arctic soils, when and why buried horizons formed as result of cryoturbation in northern Sweden remain unclear. In this study, we used 14C and 210Pb dating to assess when organic matter was buried within non-sorted circles fields near Abisko in northern Sweden. In addition, we used aerial photos from 1959 and 2008 to detect eventual trends in cryogenic activities during this period. We found that organic matter from former organic horizons (stratigraphically intact or partly fragmented) corresponds to three major periods: 0–100 A.D., 900–1250 A.D., and 1650–1950 A.D. The latter two periods were indicated by several dated samples, while the extent of the oldest period is more uncertainty (indicated by only one sample). The aerial photos suggest a net overgrowth by shrub vegetation of previously exposed mineral soil surfaces since 1959. This overgrowth trend was seen in most of the studied fields (92 out of 137 analyzed fields), indicating that the cryogenic activity has mainly decreased in studied non-sorted circles fields since the 1950s. This latter interpretation is also supported by the absence of buried organic layers formed during the last decades. We suggest that the organic matter was buried during the transition from longer cold periods to warmer conditions. We believe these climatic shifts could have triggered regional scale burial of soil organic matter and thus affected how these soils sequestered carbon.\n
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\n \n\n \n \n \n \n \n \n Physical mixing between humus and mineral matter found in cryoturbated soils increases short-term heterotrophic respiration rates.\n \n \n \n \n\n\n \n Klaminder, J.; Giesler, R.; and Makoto, K.\n\n\n \n\n\n\n Soil Biology and Biochemistry, 57: 922–924. February 2013.\n \n\n\n\n
\n\n\n\n \n \n \"PhysicalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_physical_2013,\n\ttitle = {Physical mixing between humus and mineral matter found in cryoturbated soils increases short-term heterotrophic respiration rates},\n\tvolume = {57},\n\tissn = {0038-0717},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0038071712004178},\n\tdoi = {10.1016/j.soilbio.2012.10.038},\n\tabstract = {Cryoturbation is an important mechanism in the most recent large-scale model describing the build-up of soil organic carbon (SOC) in arctic soils. In this paper, we hypothesize that the physical mixing of humus and mineral soil generated by this process causes previously unconsidered effects on respiration rates. Through laboratory incubations we found that mixing of humus into mineral soil from cryoturbated soils primed heterotrophic respiration rates by about 40\\%, which was of the same magnitude as the effect generated by a rise in soil temperature from 5 °C to 10 °C. Our result indicates that cryogenic mixing, if complete, may generate short-term positive effects on heterotrophic respiration rates as long as the mixing does not translocate carbon into much colder soil layers.},\n\turldate = {2017-02-07},\n\tjournal = {Soil Biology and Biochemistry},\n\tauthor = {Klaminder, J. and Giesler, R. and Makoto, K.},\n\tmonth = feb,\n\tyear = {2013},\n\tkeywords = {\\#nosource, Arctic, Cryoturbation, Heterotrophic respiration rates, Soil},\n\tpages = {922--924},\n}\n\n\n\n
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\n Cryoturbation is an important mechanism in the most recent large-scale model describing the build-up of soil organic carbon (SOC) in arctic soils. In this paper, we hypothesize that the physical mixing of humus and mineral soil generated by this process causes previously unconsidered effects on respiration rates. Through laboratory incubations we found that mixing of humus into mineral soil from cryoturbated soils primed heterotrophic respiration rates by about 40%, which was of the same magnitude as the effect generated by a rise in soil temperature from 5 °C to 10 °C. Our result indicates that cryogenic mixing, if complete, may generate short-term positive effects on heterotrophic respiration rates as long as the mixing does not translocate carbon into much colder soil layers.\n
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\n \n\n \n \n \n \n \n \n CARD-FISH analysis of prokaryotic community composition and abundance along small-scale vegetation gradients in a dry arctic tundra ecosystem.\n \n \n \n \n\n\n \n Ushio, M.; Makoto, K.; Klaminder, J.; and Nakano, S.\n\n\n \n\n\n\n Soil Biology and Biochemistry, 64: 147–154. September 2013.\n \n\n\n\n
\n\n\n\n \n \n \"CARD-FISHPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{ushio_card-fish_2013,\n\ttitle = {{CARD}-{FISH} analysis of prokaryotic community composition and abundance along small-scale vegetation gradients in a dry arctic tundra ecosystem},\n\tvolume = {64},\n\tissn = {0038-0717},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0038071713001594},\n\tdoi = {10.1016/j.soilbio.2013.05.002},\n\tabstract = {The size and composition of soil microbial communities have important influences on terrestrial ecosystem processes such as soil decomposition. However, compared with studies of aboveground plant communities, there are relatively few studies on belowground microbial communities and their interactions with aboveground vegetations in the arctic region. In this study, we conducted the first investigation of the abundance and composition of prokaryotic communities along small-scale vegetation gradients (ca. 1–3 m) in a dry arctic tundra ecosystem in Northern Sweden using fluorescent in situ hybridization (FISH) coupled with catalyzed reporter deposition (CARD). The number of prokaryotic cells increased with increasing vegetation cover along vegetation gradients, mainly as a function of increased amounts of soil carbon and moisture. Eubacteria and Archaea constituted approximately 59.7\\% and 33.4\\% of DAPI-positive cells, respectively. Among the analyzed bacterial phyla and sub-phyla, Acidobacteria and α-proteobacteria were the most dominant groups, constituting approximately 13.5\\% and 10.7\\% of DAPI-positive cells, respectively. Interestingly, the soil prokaryotic community composition was relatively unaffected by the dramatic changes in the aboveground vegetation community. Multivariate analyses suggested that the prokaryotic community composition depended on soil pH rather than on aboveground vegetation. Surface plants are weak predictors of the composition of the soil microbial community in the studied soil system and the size of the community is constrained by carbon and water availability. In addition, our study demonstrated that CARD-FISH, which is still a rarely-used technique in soil ecology, is effective for quantifying soil microbes.},\n\turldate = {2017-02-07},\n\tjournal = {Soil Biology and Biochemistry},\n\tauthor = {Ushio, Masayuki and Makoto, Kobayashi and Klaminder, Jonatan and Nakano, Shin-ichi},\n\tmonth = sep,\n\tyear = {2013},\n\tkeywords = {\\#nosource, Archaea, CARD-FISH, Soil microbial community, Tundra ecosystem, Vegetation gradients, bacteria},\n\tpages = {147--154},\n}\n\n\n\n
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\n The size and composition of soil microbial communities have important influences on terrestrial ecosystem processes such as soil decomposition. However, compared with studies of aboveground plant communities, there are relatively few studies on belowground microbial communities and their interactions with aboveground vegetations in the arctic region. In this study, we conducted the first investigation of the abundance and composition of prokaryotic communities along small-scale vegetation gradients (ca. 1–3 m) in a dry arctic tundra ecosystem in Northern Sweden using fluorescent in situ hybridization (FISH) coupled with catalyzed reporter deposition (CARD). The number of prokaryotic cells increased with increasing vegetation cover along vegetation gradients, mainly as a function of increased amounts of soil carbon and moisture. Eubacteria and Archaea constituted approximately 59.7% and 33.4% of DAPI-positive cells, respectively. Among the analyzed bacterial phyla and sub-phyla, Acidobacteria and α-proteobacteria were the most dominant groups, constituting approximately 13.5% and 10.7% of DAPI-positive cells, respectively. Interestingly, the soil prokaryotic community composition was relatively unaffected by the dramatic changes in the aboveground vegetation community. Multivariate analyses suggested that the prokaryotic community composition depended on soil pH rather than on aboveground vegetation. Surface plants are weak predictors of the composition of the soil microbial community in the studied soil system and the size of the community is constrained by carbon and water availability. In addition, our study demonstrated that CARD-FISH, which is still a rarely-used technique in soil ecology, is effective for quantifying soil microbes.\n
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\n  \n 2012\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n The influence of non-sorted circles on species diversity of vascular plants, bryophytes and lichens in Sub-Arctic Tundra.\n \n \n \n\n\n \n Makoto, K.; and Klaminder, J.\n\n\n \n\n\n\n Polar Biology, 35(11): 1659–1667. November 2012.\n 00018\n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{makoto_influence_2012,\n\ttitle = {The influence of non-sorted circles on species diversity of vascular plants, bryophytes and lichens in {Sub}-{Arctic} {Tundra}},\n\tvolume = {35},\n\tissn = {0722-4060},\n\tdoi = {10.1007/s00300-012-1206-3},\n\tabstract = {Non-sorted circles (NSCs), also known as frost boils, are common soil frost features that create a small-scale mosaic of vegetation zones in periglacial landscapes. The causes of variation in plant diversity within NSCs are poorly understood. This lack of understanding hampers our ability to predict how arctic plant communities respond to changing soil frost conditions. We hypothesised that plant communities of different ages develop at a micro-site scale within NSCs as soil frost periodically exposes uncolonised soil or fatally offsets plant succession. To test this hypothesis, we investigated the species diversity of plant communities (vascular plants, bryophytes and lichens) from the sparsely vegetated centre of the circles to the densely vegetated outer domain in conjunction with estimates of the age of the plant communities (inferred using lichenometry). Our results suggest that the variation in species diversity and density can largely be explained by the occurrence of progressively older plant communities from the centre towards the vegetated rim. Here, the high species diversity was observed to occur in communities having the ages approximately around 150 years. Our findings suggest that soil frost disturbances are important for maintaining successional gradients several centuries long within the arctic landscape at a small spatial scale ({\\textless} 3 m). The termination of soil frost activity as a result of a warmer future winter climate is therefore most likely to result in a loss of micro-sites having young vegetation communities with high plant diversities and a subsequent establishment of mature shrub-dominated plant communities.},\n\tlanguage = {English},\n\tnumber = {11},\n\tjournal = {Polar Biology},\n\tauthor = {Makoto, K. and Klaminder, J.},\n\tmonth = nov,\n\tyear = {2012},\n\tnote = {00018},\n\tkeywords = {\\#nosource, Cryoturbation, Ecosystems, Frost boil, Periglacial   process, Plant species diversity, alaska, bioclimate gradient, climate change, communities, forms, growth-response, manipulations, northern sweden, removal, vegetation},\n\tpages = {1659--1667},\n}\n\n\n\n
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\n Non-sorted circles (NSCs), also known as frost boils, are common soil frost features that create a small-scale mosaic of vegetation zones in periglacial landscapes. The causes of variation in plant diversity within NSCs are poorly understood. This lack of understanding hampers our ability to predict how arctic plant communities respond to changing soil frost conditions. We hypothesised that plant communities of different ages develop at a micro-site scale within NSCs as soil frost periodically exposes uncolonised soil or fatally offsets plant succession. To test this hypothesis, we investigated the species diversity of plant communities (vascular plants, bryophytes and lichens) from the sparsely vegetated centre of the circles to the densely vegetated outer domain in conjunction with estimates of the age of the plant communities (inferred using lichenometry). Our results suggest that the variation in species diversity and density can largely be explained by the occurrence of progressively older plant communities from the centre towards the vegetated rim. Here, the high species diversity was observed to occur in communities having the ages approximately around 150 years. Our findings suggest that soil frost disturbances are important for maintaining successional gradients several centuries long within the arctic landscape at a small spatial scale (\\textless 3 m). The termination of soil frost activity as a result of a warmer future winter climate is therefore most likely to result in a loss of micro-sites having young vegetation communities with high plant diversities and a subsequent establishment of mature shrub-dominated plant communities.\n
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\n  \n 2011\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n The origin of lead in the organic horizon of tundra soils: Atmospheric deposition, plant translocation from the mineral soil or soil mineral mixing?.\n \n \n \n \n\n\n \n Klaminder, J.; Farmer, J. G.; and MacKenzie, A. B.\n\n\n \n\n\n\n Science of The Total Environment, 409(20): 4344–4350. September 2011.\n \n\n\n\n
\n\n\n\n \n \n \"ThePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_origin_2011,\n\ttitle = {The origin of lead in the organic horizon of tundra soils: {Atmospheric} deposition, plant translocation from the mineral soil or soil mineral mixing?},\n\tvolume = {409},\n\tissn = {0048-9697},\n\tshorttitle = {The origin of lead in the organic horizon of tundra soils},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0048969711007212},\n\tdoi = {10.1016/j.scitotenv.2011.07.005},\n\tabstract = {Knowledge of the anthropogenic contribution to lead (Pb) concentrations in surface soils in high latitude ecosystems is central to our understanding of the extent of atmospheric Pb contamination. In this study, we reconstructed fallout of Pb at a remote sub-arctic region by using two ombrotrophic peat cores and assessed the extent to which this airborne Pb is able to explain the isotopic composition (206Pb/207Pb ratio) in the O-horizon of tundra soils. In the peat cores, long-range atmospheric fallout appeared to be the main source of Pb as indicated by temporal trends that followed the known European pollution history, i.e. accelerated fallout at the onset of industrialization and peak fallout around the 1960s–70s. The Pb isotopic composition of the O-horizon of podzolic tundra soil (206Pb/207Pb = 1.170 ± 0.002; mean ± SD) overlapped with that of the peat (206Pb/207Pb = 1.16 ± 0.01) representing a proxy for atmospheric aerosols, but was clearly different from that of the parent soil material (206Pb/207Pb = 1.22–1.30). This finding indicated that long-range fallout of atmospheric Pb is the main driver of Pb accumulation in podzolic tundra soil. In O-horizons of tundra soil weakly affected by cryoturbation (cryosols) however, the input of Pb from the underlying mineral soil increased as indicated by 206Pb/207Pb ratios of up to 1.20, a value closer to that of local soil minerals. Nevertheless, atmospheric Pb appeared to be the dominant source in this soil compartment. We conclude that Pb concentrations in the O-horizon of studied tundra soils – despite being much lower than in boreal soils and representative for one of the least exposed sites to atmospheric Pb contaminants in Europe – are mainly controlled by atmospheric inputs from distant anthropogenic sources.},\n\tnumber = {20},\n\turldate = {2017-02-07},\n\tjournal = {Science of The Total Environment},\n\tauthor = {Klaminder, Jonatan and Farmer, John G. and MacKenzie, Angus B.},\n\tmonth = sep,\n\tyear = {2011},\n\tkeywords = {\\#nosource, Contamination, Cryoturbation, Pb isotopes, Tundra soil},\n\tpages = {4344--4350},\n}\n\n\n\n
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\n Knowledge of the anthropogenic contribution to lead (Pb) concentrations in surface soils in high latitude ecosystems is central to our understanding of the extent of atmospheric Pb contamination. In this study, we reconstructed fallout of Pb at a remote sub-arctic region by using two ombrotrophic peat cores and assessed the extent to which this airborne Pb is able to explain the isotopic composition (206Pb/207Pb ratio) in the O-horizon of tundra soils. In the peat cores, long-range atmospheric fallout appeared to be the main source of Pb as indicated by temporal trends that followed the known European pollution history, i.e. accelerated fallout at the onset of industrialization and peak fallout around the 1960s–70s. The Pb isotopic composition of the O-horizon of podzolic tundra soil (206Pb/207Pb = 1.170 ± 0.002; mean ± SD) overlapped with that of the peat (206Pb/207Pb = 1.16 ± 0.01) representing a proxy for atmospheric aerosols, but was clearly different from that of the parent soil material (206Pb/207Pb = 1.22–1.30). This finding indicated that long-range fallout of atmospheric Pb is the main driver of Pb accumulation in podzolic tundra soil. In O-horizons of tundra soil weakly affected by cryoturbation (cryosols) however, the input of Pb from the underlying mineral soil increased as indicated by 206Pb/207Pb ratios of up to 1.20, a value closer to that of local soil minerals. Nevertheless, atmospheric Pb appeared to be the dominant source in this soil compartment. We conclude that Pb concentrations in the O-horizon of studied tundra soils – despite being much lower than in boreal soils and representative for one of the least exposed sites to atmospheric Pb contaminants in Europe – are mainly controlled by atmospheric inputs from distant anthropogenic sources.\n
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\n \n\n \n \n \n \n \n Stable carbon isotopes as indicators for environmental change in palsa peats.\n \n \n \n\n\n \n Alewell, C.; Giesler, R.; Klaminder, J.; Leifeld, J.; and Rollog, M.\n\n\n \n\n\n\n Biogeosciences, 8(7): 1769–1778. 2011.\n \n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{alewell_stable_2011,\n\ttitle = {Stable carbon isotopes as indicators for environmental change in palsa peats},\n\tvolume = {8},\n\tissn = {1726-4170},\n\tdoi = {10.5194/bg-8-1769-2011},\n\tabstract = {Palsa peats are unique northern ecosystems formed under an arctic climate and characterized by a high biodiversity and sensitive ecology. The stability of the palsas are seriously threatened by climate warming which will change the permafrost dynamic and induce a degradation of the mires. We used stable carbon isotope depth profiles in two palsa mires of Northern Sweden to track environmental change during the formation of the mires. Soils dominated by aerobic degradation can be expected to have a clear increase of carbon isotopes (delta C-13) with depth, due to preferential release of C-12 during aerobic mineralization. In soils with suppressed degradation due to anoxic conditions, stable carbon isotope depth profiles are either more or less uniform indicating no or very low degradation or depth profiles turn to lighter values due to an enrichment of recalcitrant organic substances during anaerobic mineralisation which are depleted in C-13. The isotope depth profile of the peat in the water saturated depressions (hollows) at the yet undisturbed mire Storflaket indicated very low to no degradation but increased rates of anaerobic degradation at the Stordalen site. The latter might be induced by degradation of the permafrost cores in the uplifted areas (hummocks) and subsequent breaking and submerging of the hummock peat into the hollows due to climate warming. Carbon isotope depth profiles of hummocks indicated a turn from aerobic mineralisation to anaerobic degradation at a peat depth between 4 and 25 cm. The age of these turning points was C-14 dated between 150 and 670 yr and could thus not be caused by anthropogenically induced climate change. We found the uplifting of the hummocks due to permafrost heave the most likely explanation for our findings. We thus concluded that differences in carbon isotope profiles of the hollows might point to the disturbance of the mires due to climate warming or due to differences in hydrology. The characteristic profiles of the hummocks are indicators for micro-geomorphic change during permafrost up heaving.},\n\tlanguage = {English},\n\tnumber = {7},\n\tjournal = {Biogeosciences},\n\tauthor = {Alewell, C. and Giesler, R. and Klaminder, J. and Leifeld, J. and Rollog, M.},\n\tyear = {2011},\n\tkeywords = {\\#nosource, Soil, Sphagnum, arctic mire, bog, climate, delta-c-13, methane release, organic-matter, permian-triassic boundary, phenolic constituents},\n\tpages = {1769--1778},\n}\n\n\n\n
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\n Palsa peats are unique northern ecosystems formed under an arctic climate and characterized by a high biodiversity and sensitive ecology. The stability of the palsas are seriously threatened by climate warming which will change the permafrost dynamic and induce a degradation of the mires. We used stable carbon isotope depth profiles in two palsa mires of Northern Sweden to track environmental change during the formation of the mires. Soils dominated by aerobic degradation can be expected to have a clear increase of carbon isotopes (delta C-13) with depth, due to preferential release of C-12 during aerobic mineralization. In soils with suppressed degradation due to anoxic conditions, stable carbon isotope depth profiles are either more or less uniform indicating no or very low degradation or depth profiles turn to lighter values due to an enrichment of recalcitrant organic substances during anaerobic mineralisation which are depleted in C-13. The isotope depth profile of the peat in the water saturated depressions (hollows) at the yet undisturbed mire Storflaket indicated very low to no degradation but increased rates of anaerobic degradation at the Stordalen site. The latter might be induced by degradation of the permafrost cores in the uplifted areas (hummocks) and subsequent breaking and submerging of the hummock peat into the hollows due to climate warming. Carbon isotope depth profiles of hummocks indicated a turn from aerobic mineralisation to anaerobic degradation at a peat depth between 4 and 25 cm. The age of these turning points was C-14 dated between 150 and 670 yr and could thus not be caused by anthropogenically induced climate change. We found the uplifting of the hummocks due to permafrost heave the most likely explanation for our findings. We thus concluded that differences in carbon isotope profiles of the hollows might point to the disturbance of the mires due to climate warming or due to differences in hydrology. The characteristic profiles of the hummocks are indicators for micro-geomorphic change during permafrost up heaving.\n
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\n  \n 2010\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Climate driven release of carbon and mercury from permafrost mires increases mercury loading to sub-arctic lakes.\n \n \n \n \n\n\n \n Rydberg, J.; Klaminder, J.; Rosén, P.; and Bindler, R.\n\n\n \n\n\n\n Science of The Total Environment, 408(20): 4778–4783. September 2010.\n 00052\n\n\n\n
\n\n\n\n \n \n \"ClimatePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{rydberg_climate_2010,\n\ttitle = {Climate driven release of carbon and mercury from permafrost mires increases mercury loading to sub-arctic lakes},\n\tvolume = {408},\n\tissn = {0048-9697},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0048969710006613},\n\tdoi = {10.1016/j.scitotenv.2010.06.056},\n\tabstract = {In sub-arctic and arctic regions mercury is an element of concern for both wildlife and humans. Over thousands of years large amounts of atmospherically deposited mercury, both from natural and anthropogenic sources, have been sequestered together with carbon in northern peatlands. Many of these peatlands are currently underlain by permafrost, which controls mire stability and hydrology. With the ongoing climate change there is concern that permafrost thawing will turn large areas of these northern peatlands from carbon/mercury-sinks into much wetter carbon/mercury-sources. Here we can show that such a change in mire structure in the sub-arctic Stordalen mire in northern Sweden actually is responsible for an increased export of mercury to the adjacent lake Inre Harrsjön. We also show that sediment mercury accumulation rates during a warm period in the pre-industrial past were higher than in the 1970s when atmospheric input peaked, indicating that in areas with permafrost, climate can have an effect on mercury loading to lakes as large as anthropogenic emissions. Thawing of permafrost and the subsequent export of carbon is a widespread phenomenon, and the projection is that it will increase even more in the near future. Together with our observations from Stordalen, this makes northern peatlands into a substantial source of mercury, at risk of being released into sensitive arctic freshwater and marine systems.},\n\tnumber = {20},\n\turldate = {2017-02-07},\n\tjournal = {Science of The Total Environment},\n\tauthor = {Rydberg, Johan and Klaminder, Jonatan and Rosén, Peter and Bindler, Richard},\n\tmonth = sep,\n\tyear = {2010},\n\tnote = {00052},\n\tkeywords = {\\#nosource, NIRS, Permafrost dynamics, Sediment, mercury, peat},\n\tpages = {4778--4783},\n}\n\n\n\n
\n
\n\n\n
\n In sub-arctic and arctic regions mercury is an element of concern for both wildlife and humans. Over thousands of years large amounts of atmospherically deposited mercury, both from natural and anthropogenic sources, have been sequestered together with carbon in northern peatlands. Many of these peatlands are currently underlain by permafrost, which controls mire stability and hydrology. With the ongoing climate change there is concern that permafrost thawing will turn large areas of these northern peatlands from carbon/mercury-sinks into much wetter carbon/mercury-sources. Here we can show that such a change in mire structure in the sub-arctic Stordalen mire in northern Sweden actually is responsible for an increased export of mercury to the adjacent lake Inre Harrsjön. We also show that sediment mercury accumulation rates during a warm period in the pre-industrial past were higher than in the 1970s when atmospheric input peaked, indicating that in areas with permafrost, climate can have an effect on mercury loading to lakes as large as anthropogenic emissions. Thawing of permafrost and the subsequent export of carbon is a widespread phenomenon, and the projection is that it will increase even more in the near future. Together with our observations from Stordalen, this makes northern peatlands into a substantial source of mercury, at risk of being released into sensitive arctic freshwater and marine systems.\n
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\n \n\n \n \n \n \n \n Lead Contamination of Subarctic Lakes and Its Response to Reduced Atmospheric Fallout: Can the Recovery Process Be Counteracted by the Ongoing Climate Change?.\n \n \n \n\n\n \n Klaminder, J.; Hammarlund, D.; Kokfelt, U.; Vonk, J. E.; and Bigler, C.\n\n\n \n\n\n\n Environmental Science & Technology, 44(7): 2335–2340. April 2010.\n 00017\n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_lead_2010,\n\ttitle = {Lead {Contamination} of {Subarctic} {Lakes} and {Its} {Response} to {Reduced} {Atmospheric} {Fallout}: {Can} the {Recovery} {Process} {Be} {Counteracted} by the {Ongoing} {Climate} {Change}?},\n\tvolume = {44},\n\tissn = {0013-936X},\n\tshorttitle = {Lead {Contamination} of {Subarctic} {Lakes} and {Its} {Response} to {Reduced} {Atmospheric} {Fallout}},\n\tdoi = {10.1021/es903025z},\n\tabstract = {Can a climate-triggered export of old contaminants from the soil alter the lead (Pb) contaminant burden of subarctic lakes? To address this question, we reconstructed the pollution history of three high latitude lakes situated in a region where a recent climatic shift has occurred. Dated sediment records were used as archives of past Pb inputs to the lakes, where the difference in the Pb-206/Pb-207 ratio between atmospheric contaminants (Pb-206/Pb-207 ratio {\\textless}1.16) and geogenic Pb in the catchment soil (Pb-206/Pb-207 ratio {\\textgreater}1.22) were used to trace fluxes of Pb contaminants. Lead contaminants were found in sediments deposited since Roman times. A significant export of Pb from the soil contaminant pool is indicated in two of the lakes surrounded by near-shore permafrost soils. Here, levels of Pb contaminants and Pb-206/Pb-207 ratios of sediments deposited after the 1970s appear not to have been strongly affected by the {\\textgreater}= 90\\% reduction in atmospheric deposition rates and increasing Pb-206/Pb-207 ratios of atmospheric Pb since the 1990s. We concluded that soil processes stimulated by the ongoing climate change at high latitudes might work counteractive to efforts to reduce contaminant levels in subarctic lakes.},\n\tlanguage = {English},\n\tnumber = {7},\n\tjournal = {Environmental Science \\& Technology},\n\tauthor = {Klaminder, Jonatan and Hammarlund, Dan and Kokfelt, Ulla and Vonk, Jorien E. and Bigler, Christian},\n\tmonth = apr,\n\tyear = {2010},\n\tnote = {00017},\n\tkeywords = {\\#nosource, Boreal forest, Holocene, deposition record, northern sweden, organic-rich, pollution, scotland, sediments, soils, upland catchment},\n\tpages = {2335--2340},\n}\n\n\n\n
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\n Can a climate-triggered export of old contaminants from the soil alter the lead (Pb) contaminant burden of subarctic lakes? To address this question, we reconstructed the pollution history of three high latitude lakes situated in a region where a recent climatic shift has occurred. Dated sediment records were used as archives of past Pb inputs to the lakes, where the difference in the Pb-206/Pb-207 ratio between atmospheric contaminants (Pb-206/Pb-207 ratio \\textless1.16) and geogenic Pb in the catchment soil (Pb-206/Pb-207 ratio \\textgreater1.22) were used to trace fluxes of Pb contaminants. Lead contaminants were found in sediments deposited since Roman times. A significant export of Pb from the soil contaminant pool is indicated in two of the lakes surrounded by near-shore permafrost soils. Here, levels of Pb contaminants and Pb-206/Pb-207 ratios of sediments deposited after the 1970s appear not to have been strongly affected by the \\textgreater= 90% reduction in atmospheric deposition rates and increasing Pb-206/Pb-207 ratios of atmospheric Pb since the 1990s. We concluded that soil processes stimulated by the ongoing climate change at high latitudes might work counteractive to efforts to reduce contaminant levels in subarctic lakes.\n
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\n  \n 2009\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n Soil carbon accumulation in the dry tundra: Important role played by precipitation.\n \n \n \n \n\n\n \n Klaminder, J.; Yoo, K.; and Giesler, R.\n\n\n \n\n\n\n Journal of Geophysical Research: Biogeosciences, 114(G4): G04005. December 2009.\n \n\n\n\n
\n\n\n\n \n \n \"SoilPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_soil_2009,\n\ttitle = {Soil carbon accumulation in the dry tundra: {Important} role played by precipitation},\n\tvolume = {114},\n\tissn = {2156-2202},\n\tshorttitle = {Soil carbon accumulation in the dry tundra},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1029/2009JG000947/abstract},\n\tdoi = {10.1029/2009JG000947},\n\tabstract = {A positive relationship between the mean annual precipitation (MAP) and soil organic carbon (SOC) is found in most surveys covering the subarctic and boreal region. In this paper we assess mechanisms behind variable SOC pools in dry tundra soils developed along a 50 km long subarctic precipitation (snow) gradient in northern Sweden. Lead 210 is used to infer SOC accumulation rates in the O horizon. Despite an unchanged or even slightly decreasing accumulation rate of SOC in the O horizon (range 0.02–0.06 kg C m−2 yr−1) along with increasing MAP and a relative constant litter input (∼0.04 kg C m−2 yr−1), the SOC pool in the upper 1 m increase significantly with increasing MAP. This trend is mainly due to a progressively buildup of SOC in the mineral soil and argued to be the result of an accelerated vertical translocation of SOC at sites overlain by a thick snowpack. Furthermore, the loss of SOC from the O horizon through wind erosion appears to be more pronounced at snow-poor sites. We estimate that vegetated heath soil may loose {\\textgreater}0.02 kg C m−2 yr−1 (∼half of the annual litter fall) due to wind erosion in snow-poor areas. We stress that lateral and vertical translocation processes inherent by precipitation regimes may be of fundamental importance for the long-term SOC accumulation in tundra soil.},\n\tlanguage = {en},\n\tnumber = {G4},\n\turldate = {2017-02-07},\n\tjournal = {Journal of Geophysical Research: Biogeosciences},\n\tauthor = {Klaminder, Jonatan and Yoo, Kyungsoo and Giesler, Reiner},\n\tmonth = dec,\n\tyear = {2009},\n\tkeywords = {\\#nosource, Biogeochemical cycles, processes, and modeling, Pb-210, Permafrost, cryosphere, and high-latitude processes, carbon, carbon cycling, tundra},\n\tpages = {G04005},\n}\n\n\n\n
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\n A positive relationship between the mean annual precipitation (MAP) and soil organic carbon (SOC) is found in most surveys covering the subarctic and boreal region. In this paper we assess mechanisms behind variable SOC pools in dry tundra soils developed along a 50 km long subarctic precipitation (snow) gradient in northern Sweden. Lead 210 is used to infer SOC accumulation rates in the O horizon. Despite an unchanged or even slightly decreasing accumulation rate of SOC in the O horizon (range 0.02–0.06 kg C m−2 yr−1) along with increasing MAP and a relative constant litter input (∼0.04 kg C m−2 yr−1), the SOC pool in the upper 1 m increase significantly with increasing MAP. This trend is mainly due to a progressively buildup of SOC in the mineral soil and argued to be the result of an accelerated vertical translocation of SOC at sites overlain by a thick snowpack. Furthermore, the loss of SOC from the O horizon through wind erosion appears to be more pronounced at snow-poor sites. We estimate that vegetated heath soil may loose \\textgreater0.02 kg C m−2 yr−1 (∼half of the annual litter fall) due to wind erosion in snow-poor areas. We stress that lateral and vertical translocation processes inherent by precipitation regimes may be of fundamental importance for the long-term SOC accumulation in tundra soil.\n
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\n  \n 2008\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n An explorative study of mercury export from a thawing palsa mire.\n \n \n \n \n\n\n \n Klaminder, J.; Yoo, K.; Rydberg, J.; and Giesler, R.\n\n\n \n\n\n\n Journal of Geophysical Research: Biogeosciences, 113(G4): G04034. December 2008.\n \n\n\n\n
\n\n\n\n \n \n \"AnPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_explorative_2008,\n\ttitle = {An explorative study of mercury export from a thawing palsa mire},\n\tvolume = {113},\n\tissn = {2156-2202},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1029/2008JG000776/abstract},\n\tdoi = {10.1029/2008JG000776},\n\tabstract = {Thawing of permafrost and a subsequent accelerated loss of mercury from the soil constitute a possible threat to the quality of high-latitude surface waters. In this paper we estimate the export of mercury generated by a thawing palsa mire in northern Sweden, by assessing net mercury storage changes along thermokarst erosion gradients. Lower mercury inventories in inundated hummocks covered by water (≤3.1 mg Hg m−2) than in noneroding hummocks (between 5.5 and 8 mg Hg m−2) suggests a release of ∼40–95\\% of the mercury pool from hummock peat experiencing subsidence and submerging. The documented expansion of submerged areas between 1970 and 2000 in the studied system indicates that permafrost thawing has initiated a mobilization of 34 to 50 g mercury. We stress the need of further assessing the fate of this mercury because the size of the mobilized mercury pool might be highly significant for subarctic surface waters.},\n\tlanguage = {en},\n\tnumber = {G4},\n\turldate = {2017-02-07},\n\tjournal = {Journal of Geophysical Research: Biogeosciences},\n\tauthor = {Klaminder, Jonatan and Yoo, Kyungsoo and Rydberg, Johan and Giesler, Reiner},\n\tmonth = dec,\n\tyear = {2008},\n\tkeywords = {\\#nosource, Arctic, Biogeochemical cycles, processes, and modeling, Climate dynamics, Hg, Metals, Permafrost, cryosphere, and high-latitude processes, climate, mercury},\n\tpages = {G04034},\n}\n\n\n\n
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\n Thawing of permafrost and a subsequent accelerated loss of mercury from the soil constitute a possible threat to the quality of high-latitude surface waters. In this paper we estimate the export of mercury generated by a thawing palsa mire in northern Sweden, by assessing net mercury storage changes along thermokarst erosion gradients. Lower mercury inventories in inundated hummocks covered by water (≤3.1 mg Hg m−2) than in noneroding hummocks (between 5.5 and 8 mg Hg m−2) suggests a release of ∼40–95% of the mercury pool from hummock peat experiencing subsidence and submerging. The documented expansion of submerged areas between 1970 and 2000 in the studied system indicates that permafrost thawing has initiated a mobilization of 34 to 50 g mercury. We stress the need of further assessing the fate of this mercury because the size of the mobilized mercury pool might be highly significant for subarctic surface waters.\n
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\n \n\n \n \n \n \n \n Is there a chronological record of atmospheric mercury and lead deposition preserved in the mor layer (O-horizon) of boreal forest soils?.\n \n \n \n\n\n \n Klaminder, J.; Bindler, R.; Rydberg, J.; and Renberg, I.\n\n\n \n\n\n\n Geochimica Et Cosmochimica Acta, 72(3): 703–712. February 2008.\n \n\n\n\n
\n\n\n\n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{klaminder_is_2008,\n\ttitle = {Is there a chronological record of atmospheric mercury and lead deposition preserved in the mor layer ({O}-horizon) of boreal forest soils?},\n\tvolume = {72},\n\tissn = {0016-7037},\n\tdoi = {10.1016/j.gca.2007.10.030},\n\tabstract = {The organic horizon (the mor layer) of podzolized boreal forest soils has accumulated atmospheric fallout of mercury and lead over centuries, resulting in current concentrations close to levels where negative effects on soil biota are thought to occur. To what extent the pollution history is preserved in the stratigraphy of this horizon is not well known. In this study we asses whether the chronology of a large historic pulse of atmospheric pollution emitted from the Ronnskar smelter in northern Sweden, particularly between 1950 and 1980, is preserved within the stratigraphy of the mor layer, which is typically 5-cm thick. Vertical sub-sampling ({\\textless}= 5 mm) of five mor profiles sampled along a 100-km pollution gradient away from the smelter are analyzed for mercury and lead concentrations, spheroidal carbonaceous particles from fossil fuel combustion (SCPs) and stable lead isotopes (Pb-206/Pb-207 and Pb-208/Pb-207). Their vertical distribution is compared with the temporal variations in atmospheric inputs reconstructed for the last similar to 100 years from analyses of an ombrotrophic peat core and a varved take sediment core sampled within a distance of 50 km of the smelter. The mor profiles situated {\\textless}= 12 km from the smelter record the pollution history of the smelter. There is a 20 to 40-times enrichment of Hg, Pb and SCP at the transition in the O-horizon from the F- to H-layer compared to the basal part and a distinct peak in the Pb-206/Pb-207 ratio (similar to 1.22) in the F-layer. The mor profiles situated outside the historical contamination range of the smelter (80 and 100 km away) record no obvious influence from the Ronnskar smelter, instead their vertical Pb-206/Pb-207 profiles follow the general regional pollution history in northern Sweden. We conclude that the mor layer preserves a record of atmospheric Hg, Pb and SCP inputs and due to low leaching rates this organic horizon serves as a semi-archive of atmospheric Hg and Pb pollution. We stress the need of including this property in the existing 'black-box' models predicting the fate of Hg and Pb within contaminated boreal forest soils. (c) 2008 Elsevier Ltd. All rights reserved.},\n\tlanguage = {English},\n\tnumber = {3},\n\tjournal = {Geochimica Et Cosmochimica Acta},\n\tauthor = {Klaminder, Jonatan and Bindler, Richard and Rydberg, Johan and Renberg, Ingernar},\n\tmonth = feb,\n\tyear = {2008},\n\tkeywords = {\\#nosource, Ecosystems, Peat bog, concentration profiles, fluxes, isotopic composition, mediterranean soils, northern sweden, ombrotrophic bogs, pollution, trends},\n\tpages = {703--712},\n}\n\n\n\n
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\n The organic horizon (the mor layer) of podzolized boreal forest soils has accumulated atmospheric fallout of mercury and lead over centuries, resulting in current concentrations close to levels where negative effects on soil biota are thought to occur. To what extent the pollution history is preserved in the stratigraphy of this horizon is not well known. In this study we asses whether the chronology of a large historic pulse of atmospheric pollution emitted from the Ronnskar smelter in northern Sweden, particularly between 1950 and 1980, is preserved within the stratigraphy of the mor layer, which is typically 5-cm thick. Vertical sub-sampling (\\textless= 5 mm) of five mor profiles sampled along a 100-km pollution gradient away from the smelter are analyzed for mercury and lead concentrations, spheroidal carbonaceous particles from fossil fuel combustion (SCPs) and stable lead isotopes (Pb-206/Pb-207 and Pb-208/Pb-207). Their vertical distribution is compared with the temporal variations in atmospheric inputs reconstructed for the last similar to 100 years from analyses of an ombrotrophic peat core and a varved take sediment core sampled within a distance of 50 km of the smelter. The mor profiles situated \\textless= 12 km from the smelter record the pollution history of the smelter. There is a 20 to 40-times enrichment of Hg, Pb and SCP at the transition in the O-horizon from the F- to H-layer compared to the basal part and a distinct peak in the Pb-206/Pb-207 ratio (similar to 1.22) in the F-layer. The mor profiles situated outside the historical contamination range of the smelter (80 and 100 km away) record no obvious influence from the Ronnskar smelter, instead their vertical Pb-206/Pb-207 profiles follow the general regional pollution history in northern Sweden. We conclude that the mor layer preserves a record of atmospheric Hg, Pb and SCP inputs and due to low leaching rates this organic horizon serves as a semi-archive of atmospheric Hg and Pb pollution. We stress the need of including this property in the existing 'black-box' models predicting the fate of Hg and Pb within contaminated boreal forest soils. (c) 2008 Elsevier Ltd. All rights reserved.\n
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