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\n  \n 2020\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n \n Geochemical tools identify the origins of Chinook Salmon returning to a restored creek.\n \n \n \n \n\n\n \n Willmes, M.; Jacinto, E., E.; Lewis, L., S.; Fichman, R., A.; Bess, Z.; Singer, G.; Steel, A.; Moyle, P.; Rypel, A., L.; Fangue, N.; Glessner, J., J.; Hobbs, J., A.; and Chapman, E., D.\n\n\n \n\n\n\n Fisheries,fsh.10516. 8 2020.\n \n\n\n\n
\n\n\n\n \n \n \"GeochemicalWebsite\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 9 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Geochemical tools identify the origins of Chinook Salmon returning to a restored creek},\n type = {article},\n year = {2020},\n pages = {fsh.10516},\n websites = {https://onlinelibrary.wiley.com/doi/abs/10.1002/fsh.10516},\n month = {8},\n day = {19},\n id = {297c8ad0-4764-3c20-9e41-00ab83ec615d},\n created = {2020-10-05T18:49:21.400Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2020-10-05T18:49:21.400Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Willmes, Malte and Jacinto, Emily E. and Lewis, Levi S. and Fichman, Rachel A. and Bess, Zachary and Singer, Gabriel and Steel, Anna and Moyle, Peter and Rypel, Andrew L. and Fangue, Nann and Glessner, Justin J.G. and Hobbs, James A. and Chapman, Eric D.},\n doi = {10.1002/fsh.10516},\n journal = {Fisheries}\n}
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\n  \n 2019\n \n \n (6)\n \n \n
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\n \n\n \n \n \n \n \n \n Role of freshwater floodplain-tidal slough complex in the persistence of the endangered delta smelt.\n \n \n \n \n\n\n \n Mahardja, B.; Hobbs, J., A.; Ikemiyagi, N.; Benjamin, A.; and Finger, A., J.\n\n\n \n\n\n\n PLOS ONE, 14(1): e0208084. 1 2019.\n \n\n\n\n
\n\n\n\n \n \n \"RoleWebsite\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 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Role of freshwater floodplain-tidal slough complex in the persistence of the endangered delta smelt},\n type = {article},\n year = {2019},\n pages = {e0208084},\n volume = {14},\n websites = {http://dx.plos.org/10.1371/journal.pone.0208084},\n month = {1},\n day = {2},\n id = {a1c3a4c1-e7c6-3dc0-8ee1-d9b710ad150e},\n created = {2019-01-03T19:51:01.394Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-01-03T19:51:01.394Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Mahardja, Brian and Hobbs, James A and Ikemiyagi, Naoaki and Benjamin, Alyssa and Finger, Amanda J.},\n editor = {Kimirei, Ismael Aaron},\n doi = {10.1371/journal.pone.0208084},\n journal = {PLOS ONE},\n number = {1}\n}
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\n \n\n \n \n \n \n \n \n Complex life histories discovered in a critically endangered fish.\n \n \n \n \n\n\n \n Hobbs, J., A.; Lewis, L., S.; Willmes, M.; Denney, C.; and Bush, E.\n\n\n \n\n\n\n Scientific Reports, 9(1): 16772. 12 2019.\n \n\n\n\n
\n\n\n\n \n \n \"ComplexWebsite\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 6 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Complex life histories discovered in a critically endangered fish},\n type = {article},\n year = {2019},\n pages = {16772},\n volume = {9},\n websites = {http://dx.doi.org/10.1038/s41598-019-52273-8,http://www.nature.com/articles/s41598-019-52273-8},\n month = {12},\n publisher = {Springer US},\n day = {14},\n id = {1ac23553-d8c8-34ae-a157-2b8cd8513322},\n created = {2019-11-25T23:11:20.372Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-11-25T23:11:20.372Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Hobbs, James A and Lewis, Levi S and Willmes, Malte and Denney, Christian and Bush, Eva},\n doi = {10.1038/s41598-019-52273-8},\n journal = {Scientific Reports},\n number = {1}\n}
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\n \n\n \n \n \n \n \n \n Calibrating temperature reconstructions from fish otolith oxygen isotope analysis for California's critically endangered Delta Smelt.\n \n \n \n \n\n\n \n Willmes, M.; Lewis, L., S.; Davis, B., E.; Loiselle, L.; James, H., F.; Denny, C.; Baxter, R.; Conrad, J., L.; Fangue, N., A.; Hung, T.; Armstrong, R., A.; Williams, I., S.; Holden, P.; and Hobbs, J., A.\n\n\n \n\n\n\n Rapid Communications in Mass Spectrometry, 33(14): 1207-1220. 7 2019.\n \n\n\n\n
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@article{\n title = {Calibrating temperature reconstructions from fish otolith oxygen isotope analysis for California's critically endangered Delta Smelt},\n type = {article},\n year = {2019},\n pages = {1207-1220},\n volume = {33},\n websites = {https://onlinelibrary.wiley.com/doi/abs/10.1002/rcm.8464},\n month = {7},\n day = {30},\n id = {c3d0a31a-cec4-31e6-a122-c52c48aba299},\n created = {2019-11-25T23:11:20.414Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-11-25T23:11:20.414Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Willmes, Malte and Lewis, Levi S. and Davis, Brittany E. and Loiselle, Liane and James, Hannah F. and Denny, Christian and Baxter, Randall and Conrad, J. Louise and Fangue, Nann A. and Hung, Tien‐Chieh and Armstrong, Richard A. and Williams, Ian S. and Holden, Peter and Hobbs, James A.},\n doi = {10.1002/rcm.8464},\n journal = {Rapid Communications in Mass Spectrometry},\n number = {14}\n}
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\n \n\n \n \n \n \n \n \n Newly discovered spawning and recruitment of threatened Longfin Smelt in restored and underexplored tidal wetlands.\n \n \n \n \n\n\n \n Lewis, L., S.; Willmes, M.; Barros, A.; Crain, P., K.; and Hobbs, J., A.\n\n\n \n\n\n\n Ecology,ecy.2868. 10 2019.\n \n\n\n\n
\n\n\n\n \n \n \"NewlyWebsite\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 4 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \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{\n title = {Newly discovered spawning and recruitment of threatened Longfin Smelt in restored and underexplored tidal wetlands},\n type = {article},\n year = {2019},\n keywords = {a comprehensive understanding of,accurate ecological models and,and habitat use of,climate,effective management and,estuary,is essential for developing,life history,marsh,novel ecosystem,osmerid,otter trawl,outflow,restoration,san francisco,species,spirinchus,the life history strategies,watershed},\n pages = {ecy.2868},\n websites = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ecy.2868},\n month = {10},\n day = {18},\n id = {6dd656f8-7bfa-347d-b699-2456bc27545b},\n created = {2019-11-25T23:11:20.614Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-11-25T23:26:09.088Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Lewis, Levi S. and Willmes, Malte and Barros, Arthur and Crain, Patrick K. and Hobbs, James A.},\n doi = {10.1002/ecy.2868},\n journal = {Ecology}\n}
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\n \n\n \n \n \n \n \n \n Functional diversity among herbivorous sea urchins on a coral reef: grazing rate, dietary preference, and metabolism.\n \n \n \n \n\n\n \n Lewis, L.; and Smith, J.\n\n\n \n\n\n\n Marine Ecology Progress Series, 625: 71-87. 8 2019.\n \n\n\n\n
\n\n\n\n \n \n \"FunctionalWebsite\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 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \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{\n title = {Functional diversity among herbivorous sea urchins on a coral reef: grazing rate, dietary preference, and metabolism},\n type = {article},\n year = {2019},\n keywords = {Biodiversity,CCA,Echinoid,Field experiment,Hawaii,In situ,Macroalgae,Metabolic theory,Preference,Turf},\n pages = {71-87},\n volume = {625},\n websites = {https://www.int-res.com/abstracts/meps/v625/p71-87/},\n month = {8},\n day = {29},\n id = {9cd828a5-95c6-360c-b386-316c34925db6},\n created = {2019-11-25T23:26:08.484Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-11-25T23:26:08.484Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Herbivores influence the structure and function of ecosystems, especially in the marine environment where ecosystems can be rapidly transformed due to the presence or absence of a single important grazer or grazing community. Intra-guild variation in the ecological functions of herbivores, however, likely determines their ultimate effects on benthic dynamics. For example, echinoids (sea urchins) can facilitate the growth of stony corals by consuming fleshy algal competitors, yet our understanding of taxonomic variation in their grazing behaviors remains limited. Here, we examined the trophic functions of 5 herbivorous echinoids on a coral reef in Maui, Hawaii. We conducted field-based assays to compare grazing rates and consumption profiles using several key algal functional groups and contrasted the results with reported differences in echinoid metabolism. Grazing rates varied among species by up to 10-fold, with taxonomic differences explaining 77−85% of the variation among individual urchins and metabolic rate explaining 81−98% of the taxonomic variation in mean biomass and energy ingestion rates. Though all species consumed several algae, they also exhibited distinct grazing behaviors. Species with lower metabolic rates exhibited the largest intraspecific variation in diets and showed no clear algal preferences. In contrast, species with higher metabolic rates consistently consumed or avoided specific macroalgae, indicating a positive relationship between metabolic rate and diet specificity. This phylogenetic variation in grazing and metabolism aligns with classic metabolic and foraging theory and suggests that species identity, community structure, and complementarity are likely key to understanding the functional roles of herbivorous echinoid communities on coral reefs.},\n bibtype = {article},\n author = {Lewis, LS and Smith, JE},\n doi = {10.3354/meps13038},\n journal = {Marine Ecology Progress Series}\n}
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\n\n\n
\n Herbivores influence the structure and function of ecosystems, especially in the marine environment where ecosystems can be rapidly transformed due to the presence or absence of a single important grazer or grazing community. Intra-guild variation in the ecological functions of herbivores, however, likely determines their ultimate effects on benthic dynamics. For example, echinoids (sea urchins) can facilitate the growth of stony corals by consuming fleshy algal competitors, yet our understanding of taxonomic variation in their grazing behaviors remains limited. Here, we examined the trophic functions of 5 herbivorous echinoids on a coral reef in Maui, Hawaii. We conducted field-based assays to compare grazing rates and consumption profiles using several key algal functional groups and contrasted the results with reported differences in echinoid metabolism. Grazing rates varied among species by up to 10-fold, with taxonomic differences explaining 77−85% of the variation among individual urchins and metabolic rate explaining 81−98% of the taxonomic variation in mean biomass and energy ingestion rates. Though all species consumed several algae, they also exhibited distinct grazing behaviors. Species with lower metabolic rates exhibited the largest intraspecific variation in diets and showed no clear algal preferences. In contrast, species with higher metabolic rates consistently consumed or avoided specific macroalgae, indicating a positive relationship between metabolic rate and diet specificity. This phylogenetic variation in grazing and metabolism aligns with classic metabolic and foraging theory and suggests that species identity, community structure, and complementarity are likely key to understanding the functional roles of herbivorous echinoid communities on coral reefs.\n
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\n \n\n \n \n \n \n \n \n Changes in benthic community composition associated with the outbreak of the corallimorph, Rhodactis howesii, at Palmyra Atoll.\n \n \n \n \n\n\n \n Carter, A., L.; Edwards, C., B.; Fox, M., D.; Amir, C., G.; Eynaud, Y.; Johnson, M., D.; Lewis, L., S.; Sandin, S., A.; and Smith, J., E.\n\n\n \n\n\n\n Coral Reefs, 38(6): 1267-1279. 12 2019.\n \n\n\n\n
\n\n\n\n \n \n \"ChangesWebsite\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{\n title = {Changes in benthic community composition associated with the outbreak of the corallimorph, Rhodactis howesii, at Palmyra Atoll},\n type = {article},\n year = {2019},\n keywords = {Coral reef,Disturbance,Invasion biology,Large-area imaging,Long-term monitoring},\n pages = {1267-1279},\n volume = {38},\n websites = {https://doi.org/10.1007/s00338-019-01841-5,http://link.springer.com/10.1007/s00338-019-01841-5},\n month = {12},\n publisher = {Springer Berlin Heidelberg},\n day = {13},\n id = {591e6af4-43f5-3c9c-8217-1260e52bc2cd},\n created = {2019-11-25T23:26:08.489Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2019-11-25T23:26:08.489Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Few studies have documented the spatial and temporal dynamics of highly invasive species in coral reef benthic communities. Here, we quantified the ecological dynamics of invasion by a corallimorph, Rhodactis howesii, at Palmyra Atoll in the central Pacific. A localized outbreak of this species was first observed following a shipwreck at Palmyra in 1991 and has subsequently spread across hectares, reaching 100% cover in some areas. We examined the spatial and temporal dynamics of this invasion, and its impact on the benthic community, using a combination of permanent photoquadrats and large-scale photomosaic imagery. Our data revealed two distinct patterns in the spatial dynamics of R. howesii on the reef. First, following the removal of the shipwreck in 2013, the cover of the corallimorph in the immediate vicinity of the wreck decreased markedly, with crustose coralline algae (CCA), an important reef-builder, dominating the newly available substrate. However, in contrast to the decline at the epicenter of the invasion, the corallimorph has spread to additional sites around the atoll where increases in abundance have been associated with decreases in hard coral cover. Reductions in percent cover and corallimorph patch size near the epicenter of the outbreak, coupled with increases in cover and patch size and appearance of the corallimorph at other locations around Palmyra, demonstrate the dynamic nature of this “invasion.” Further, we found that the corallimorph settled disproportionately often on patches of turf or CCA cover, but can then overgrow all benthic competitors following establishment. This study provides evidence that R. howesii has the capacity to be highly invasive on coral reefs and highlights the importance of large-scale, long-term monitoring efforts to capture the dynamic nature of such invasions.},\n bibtype = {article},\n author = {Carter, Amanda L. and Edwards, Clinton B. and Fox, Michael D. and Amir, Corinne G. and Eynaud, Yoan and Johnson, Maggie D. and Lewis, Levi S. and Sandin, Stuart A. and Smith, Jennifer E.},\n doi = {10.1007/s00338-019-01841-5},\n journal = {Coral Reefs},\n number = {6}\n}
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\n Few studies have documented the spatial and temporal dynamics of highly invasive species in coral reef benthic communities. Here, we quantified the ecological dynamics of invasion by a corallimorph, Rhodactis howesii, at Palmyra Atoll in the central Pacific. A localized outbreak of this species was first observed following a shipwreck at Palmyra in 1991 and has subsequently spread across hectares, reaching 100% cover in some areas. We examined the spatial and temporal dynamics of this invasion, and its impact on the benthic community, using a combination of permanent photoquadrats and large-scale photomosaic imagery. Our data revealed two distinct patterns in the spatial dynamics of R. howesii on the reef. First, following the removal of the shipwreck in 2013, the cover of the corallimorph in the immediate vicinity of the wreck decreased markedly, with crustose coralline algae (CCA), an important reef-builder, dominating the newly available substrate. However, in contrast to the decline at the epicenter of the invasion, the corallimorph has spread to additional sites around the atoll where increases in abundance have been associated with decreases in hard coral cover. Reductions in percent cover and corallimorph patch size near the epicenter of the outbreak, coupled with increases in cover and patch size and appearance of the corallimorph at other locations around Palmyra, demonstrate the dynamic nature of this “invasion.” Further, we found that the corallimorph settled disproportionately often on patches of turf or CCA cover, but can then overgrow all benthic competitors following establishment. This study provides evidence that R. howesii has the capacity to be highly invasive on coral reefs and highlights the importance of large-scale, long-term monitoring efforts to capture the dynamic nature of such invasions.\n
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\n \n\n \n \n \n \n \n \n Fishery collapse, recovery, and the cryptic decline of wild salmon on a major California river.\n \n \n \n \n\n\n \n Willmes, M.; Hobbs, J., A.; Sturrock, A., M.; Bess, Z.; Lewis, L., S.; Glessner, J., J.; Johnson, R., C.; Kurth, R.; and Kindopp, J.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences,cjfas-2017-0273. 1 2018.\n \n\n\n\n
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@article{\n title = {Fishery collapse, recovery, and the cryptic decline of wild salmon on a major California river.},\n type = {article},\n year = {2018},\n pages = {cjfas-2017-0273},\n websites = {http://www.nrcresearchpress.com/doi/10.1139/cjfas-2017-0273},\n month = {1},\n day = {11},\n id = {0481b69f-1926-353d-a2a1-f19b449d76c6},\n created = {2018-07-14T04:47:07.902Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-14T04:47:07.902Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Willmes, Malte and Hobbs, James A. and Sturrock, Anna M. and Bess, Zachary and Lewis, Levi S and Glessner, Justin J.G. and Johnson, Rachel C and Kurth, Ryon and Kindopp, Jason},\n doi = {10.1139/cjfas-2017-0273},\n journal = {Canadian Journal of Fisheries and Aquatic Sciences}\n}
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\n \n\n \n \n \n \n \n Delta Smelt and Water Politics in California.\n \n \n \n\n\n \n Moyle, P., B.; Hobbs, J., A.; and Durand, J., R.\n\n\n \n\n\n\n Fisheries, 43(1): 42-51. 2018.\n \n\n\n\n
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@article{\n title = {Delta Smelt and Water Politics in California},\n type = {article},\n year = {2018},\n pages = {42-51},\n volume = {43},\n id = {2c526c50-8aa3-3413-b1fc-f0402ff3a806},\n created = {2018-07-14T04:47:07.919Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-16T19:31:18.027Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Moyle, Peter B and Hobbs, James A and Durand, John R},\n doi = {10.1002/fsh.10014},\n journal = {Fisheries},\n number = {1}\n}
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\n \n\n \n \n \n \n \n \n Use of single nucleotide polymorphisms identifies backcrossing and species misidentifications among three San Francisco estuary osmerids.\n \n \n \n \n\n\n \n Benjamin, A.; Sağlam, İ., K.; Mahardja, B.; Hobbs, J.; Hung, T., C.; and Finger, A., J.\n\n\n \n\n\n\n Conservation Genetics, 19(3): 701-712. 2018.\n \n\n\n\n
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@article{\n title = {Use of single nucleotide polymorphisms identifies backcrossing and species misidentifications among three San Francisco estuary osmerids},\n type = {article},\n year = {2018},\n keywords = {Delta Smelt,Hybridization,Hypomesus transpacificus,RADseq,SNP,San Francisco Estuary},\n pages = {701-712},\n volume = {19},\n websites = {http://dx.doi.org/10.1007/s10592-018-1048-9},\n publisher = {Springer Netherlands},\n id = {116855a6-730a-3ddb-82fd-16de8320c178},\n created = {2018-07-16T19:24:50.992Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-16T19:24:50.992Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Benjamin, Alyssa and Sağlam, İsmail K. and Mahardja, Brian and Hobbs, James and Hung, Tien Chieh and Finger, Amanda J.},\n doi = {10.1007/s10592-018-1048-9},\n journal = {Conservation Genetics},\n number = {3}\n}
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\n \n\n \n \n \n \n \n Community Patterns and Environmental Associations for Pelagic Fishes in a Highly Modified Estuary.\n \n \n \n\n\n \n Castillo, G., C.; Damon, L., J.; and Hobbs, J., A.\n\n\n \n\n\n\n Marine and Coastal Fisheries. 2018.\n \n\n\n\n
\n\n\n\n \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
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@article{\n title = {Community Patterns and Environmental Associations for Pelagic Fishes in a Highly Modified Estuary},\n type = {article},\n year = {2018},\n id = {34970d62-a0e5-3077-a408-c647a981f483},\n created = {2018-07-16T19:28:27.515Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-16T19:28:59.534Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Castillo, Gonzalo C. and Damon, Lauren J. and Hobbs, James A.},\n journal = {Marine and Coastal Fisheries}\n}
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\n \n\n \n \n \n \n \n \n IsoFishR: An application for reproducible data reduction and analysis of strontium isotope ratios (87Sr/86Sr) obtained via laser-ablation MC-ICP-MS.\n \n \n \n \n\n\n \n Willmes, M.; Ransom, K., M.; Lewis, L., S.; Denney, C., T.; Glessner, J., J., G.; and Hobbs, J., A.\n\n\n \n\n\n\n PLOS ONE, 13(9). 9 2018.\n \n\n\n\n
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@article{\n title = {IsoFishR: An application for reproducible data reduction and analysis of strontium isotope ratios (87Sr/86Sr) obtained via laser-ablation MC-ICP-MS},\n type = {article},\n year = {2018},\n volume = {13},\n websites = {http://dx.plos.org/10.1371/journal.pone.0204519},\n month = {9},\n day = {27},\n id = {6e8ecb59-b4c1-3760-b914-e0d683575d07},\n created = {2018-10-30T18:49:08.092Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-10-30T18:49:08.092Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Willmes, Malte and Ransom, Katherine M and Lewis, Levi S and Denney, Christian T and Glessner, Justin J. G. and Hobbs, James A},\n editor = {Halcrow, Siân E},\n doi = {10.1371/journal.pone.0204519},\n journal = {PLOS ONE},\n number = {9}\n}
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\n  \n 2017\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Regional productivity predicts individual growth and recruitment of rockfishes in a northern California upwelling system.\n \n \n \n \n\n\n \n Wheeler, S., G.; Anderson, T., W.; Bell, T., W.; Morgan, S., G.; and Hobbs, J., A.\n\n\n \n\n\n\n Limnology and Oceanography, 62(2): 754-767. 3 2017.\n \n\n\n\n
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@article{\n title = {Regional productivity predicts individual growth and recruitment of rockfishes in a northern California upwelling system},\n type = {article},\n year = {2017},\n pages = {754-767},\n volume = {62},\n websites = {http://doi.wiley.com/10.1002/lno.10458},\n month = {3},\n id = {ce5cc47a-76b1-3b55-be9b-c29d8c78954e},\n created = {2017-07-06T00:05:22.322Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-07-06T00:05:22.322Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Wheeler, Sarah G. and Anderson, Todd W. and Bell, Tom W. and Morgan, Steven G. and Hobbs, James A.},\n doi = {10.1002/lno.10458},\n journal = {Limnology and Oceanography},\n number = {2}\n}
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\n \n\n \n \n \n \n \n \n Validating Fin Ray Microchemistry as a Tool to Reconstruct the Migratory History of White Sturgeon.\n \n \n \n \n\n\n \n Sellheim, K.; Willmes, M.; Hobbs, J., A.; Glessner, J., J., G.; Jackson, Z., J.; and Merz, J., E.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 146(5): 844-857. 9 2017.\n \n\n\n\n
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@article{\n title = {Validating Fin Ray Microchemistry as a Tool to Reconstruct the Migratory History of White Sturgeon},\n type = {article},\n year = {2017},\n pages = {844-857},\n volume = {146},\n websites = {https://www.tandfonline.com/doi/full/10.1080/00028487.2017.1320305},\n month = {9},\n day = {3},\n id = {edae743f-0e01-3340-9ff7-64e2c101dcad},\n created = {2017-07-06T00:05:24.085Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-07-06T00:05:24.085Z},\n read = {false},\n starred = {false},\n authored = {true},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Sellheim, Kirsten and Willmes, Malte and Hobbs, James A. and Glessner, J. J. G. and Jackson, Zachary J. and Merz, J. E.},\n doi = {10.1080/00028487.2017.1320305},\n journal = {Transactions of the American Fisheries Society},\n number = {5}\n}
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\n \n\n \n \n \n \n \n \n Is Extinction Inevitable for Delta Smelt and Longfin Smelt? An Opinion and Recommendations for Recovery.\n \n \n \n \n\n\n \n Hobbs, J., A.; Moyle, P., B.; Fangue, N.; and Connon, R., E.\n\n\n \n\n\n\n San Francisco Estuary and Watershed Science, 15(2). 2017.\n \n\n\n\n
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@article{\n title = {Is Extinction Inevitable for Delta Smelt and Longfin Smelt? An Opinion and Recommendations for Recovery},\n type = {article},\n year = {2017},\n volume = {15},\n websites = {http://escholarship.org/uc/item/2k06n13x},\n id = {624bacad-c01d-396c-a0eb-9f3b6180081d},\n created = {2018-07-16T19:24:50.745Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-16T19:24:50.745Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Nowhere are tensions between motorists, bicyclists and buses higher than in San Francisco, the birthplace of the freeway revolts, the Transit First ordinance, and Critical Mass. In Street Fight, geographer Jason Henderson offers a fresh perspective into the battle for limited urban road space, delving into the ideologies underlying the politics of mobility. Released this spring, his first book proves a provocative read for those engaged in sustainability and urban livability debates},\n bibtype = {article},\n author = {Hobbs, James A. and Moyle, Peter B. and Fangue, Nann and Connon, Richard E.},\n doi = {10.15447/sfews.2017v15iss2art2},\n journal = {San Francisco Estuary and Watershed Science},\n number = {2}\n}
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\n Nowhere are tensions between motorists, bicyclists and buses higher than in San Francisco, the birthplace of the freeway revolts, the Transit First ordinance, and Critical Mass. In Street Fight, geographer Jason Henderson offers a fresh perspective into the battle for limited urban road space, delving into the ideologies underlying the politics of mobility. Released this spring, his first book proves a provocative read for those engaged in sustainability and urban livability debates\n
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\n  \n 2016\n \n \n (4)\n \n \n
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\n \n\n \n \n \n \n \n \n 87Sr/86Sr isotope ratio analysis by laser ablation MC-ICP-MS in scales, spines, and fin rays as a non-lethal alternative to otoliths for reconstructing fish life history.\n \n \n \n \n\n\n \n Willmes, M.; Glessner, J., J.; Carleton, S., A.; Gerrity, P., C.; and Hobbs, J., A.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences, 53(9): cjfas-2016-0103. 6 2016.\n \n\n\n\n
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@article{\n title = {87Sr/86Sr isotope ratio analysis by laser ablation MC-ICP-MS in scales, spines, and fin rays as a non-lethal alternative to otoliths for reconstructing fish life history},\n type = {article},\n year = {2016},\n pages = {cjfas-2016-0103},\n volume = {53},\n websites = {http://www.nrcresearchpress.com/doi/10.1139/cjfas-2016-0103},\n month = {6},\n day = {14},\n id = {69df9664-d227-3a8e-a9c1-72583c0b4d0f},\n created = {2016-10-22T02:52:24.000Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {true},\n confirmed = {true},\n hidden = {false},\n citation_key = {Willmes2016},\n private_publication = {false},\n bibtype = {article},\n author = {Willmes, Malte and Glessner, Justin J.G. and Carleton, Scott A. and Gerrity, Paul Christopher and Hobbs, James A.},\n doi = {10.1139/cjfas-2016-0103},\n journal = {Canadian Journal of Fisheries and Aquatic Sciences},\n number = {9}\n}
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\n \n\n \n \n \n \n \n \n Life History Diversity in Klamath River Steelhead.\n \n \n \n \n\n\n \n Hodge, B., W.; Wilzbach, M., A.; Duffy, W., G.; Quiñones, R., M.; and Hobbs, J., A.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 145(2): 227-238. 3 2016.\n \n\n\n\n
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@article{\n title = {Life History Diversity in Klamath River Steelhead},\n type = {article},\n year = {2016},\n pages = {227-238},\n volume = {145},\n websites = {http://www.tandfonline.com/doi/full/10.1080/00028487.2015.1111257},\n month = {3},\n day = {3},\n id = {441af601-ae2f-3ce6-87a9-31e7c5a05850},\n created = {2016-10-22T02:52:24.000Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hodge2016},\n private_publication = {false},\n bibtype = {article},\n author = {Hodge, Brian W. and Wilzbach, Margaret A. and Duffy, Walter G. and Quiñones, Rebecca M. and Hobbs, James A.},\n doi = {10.1080/00028487.2015.1111257},\n journal = {Transactions of the American Fisheries Society},\n number = {2}\n}
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\n \n\n \n \n \n \n \n Delta Smelt: Life History and Decline of a Once-Abundant Species in the San Francisco Estuary.\n \n \n \n\n\n \n Moyle, P., B.; Brown, L., R.; Durand, J., R.; and Hobbs, J., A.\n\n\n \n\n\n\n San Francisco Estuary and Watershed Science, 14(2). 2016.\n \n\n\n\n
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@article{\n title = {Delta Smelt: Life History and Decline of a Once-Abundant Species in the San Francisco Estuary},\n type = {article},\n year = {2016},\n volume = {14},\n id = {324a7abc-3400-331f-9fe3-f943a773ad63},\n created = {2016-10-22T02:52:24.000Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Moyle, Peter B. and Brown, Larry R. and Durand, John R. and Hobbs, James A.},\n doi = {http://dx.doi.org/10.15447/sfews.2016v14iss2art6},\n journal = {San Francisco Estuary and Watershed Science},\n number = {2}\n}
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\n \n\n \n \n \n \n \n Delta Smelt: Life History and Decline of a Once-Abundant Species in the San Francisco Estuary.\n \n \n \n\n\n \n Moyle, P., B.; Brown, L., R.; Durand, J., R.; and Hobbs, J., A.\n\n\n \n\n\n\n San Francisco Estuary and Watershed Science, 14(2). 2016.\n \n\n\n\n
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@article{\n title = {Delta Smelt: Life History and Decline of a Once-Abundant Species in the San Francisco Estuary},\n type = {article},\n year = {2016},\n volume = {14},\n id = {b2f6ddbb-d27f-3293-ae89-94db6b7547da},\n created = {2018-03-10T00:59:23.854Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-03-10T00:59:23.854Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n bibtype = {article},\n author = {Moyle, Peter B. and Brown, Larry R. and Durand, John R. and Hobbs, James A.},\n doi = {http://dx.doi.org/10.15447/sfews.2016v14iss2art6},\n journal = {San Francisco Estuary and Watershed Science},\n number = {2}\n}
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\n  \n 2015\n \n \n (3)\n \n \n
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\n \n\n \n \n \n \n \n \n Metapopulation structure of a semi-anadromous fish in a dynamic environment.\n \n \n \n \n\n\n \n Feyrer, F.; Hobbs, J.; Acuña, S.; Mahardja, B.; Grimaldo, L.; Baerwald, M.; Johnson, R., C.; and Teh, S.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences, 72(5): 709-721. 5 2015.\n \n\n\n\n
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@article{\n title = {Metapopulation structure of a semi-anadromous fish in a dynamic environment},\n type = {article},\n year = {2015},\n pages = {709-721},\n volume = {72},\n websites = {http://www.nrcresearchpress.com/doi/10.1139/cjfas-2014-0433},\n month = {5},\n publisher = {National Research Council of Canada},\n id = {4e96c417-3665-3155-8672-c95db3e946fc},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Feyrer2015},\n private_publication = {false},\n abstract = {The Sacramento splittail (Pogonichthys macrolepidotus) is a relatively large (400 mm), long-lived (8 years) demersal cyprinid of conservation importance endemic to the San Francisco Estuary (SFE), California, USA. It exhibits a semi-anadromous life cycle spending adult life in low to moderate salinity (0-12) habitat with migrations into upstream freshwater rivers and floodplains for spawning during winter-spring. The species persists as two genetically distinguishable populations - one dominant and one subordinate - separated by discrete spawning habitats that we suggest resemble an island-mainland metapopulation structure. The populations overlap in distribution in the SFE, yet segregation is maintained with individuals tending to aggregate or school with others of similar population heritage and natal origin. The populations are spatially connected via dispersal of the dominant population into the subordinate population's spawning habitat when climate patterns produce freshwater outflow sufficient to form a bridge of suitable low salinity habitat across the upper SFE. Habitat affinities of the two populations, hydrodynamic modeling studies, and historical outflow records together suggest such conditions occur in approximately 1/3 of years overall with an irregular frequency. This dynamic pattern of spatial connectivity controlled by climate variability may be an important driver of gene flow between the two populations.},\n bibtype = {article},\n author = {Feyrer, Frederick and Hobbs, James and Acuña, Shawn and Mahardja, Brian and Grimaldo, Lenny and Baerwald, Melinda and Johnson, Rachel C. and Teh, Swee},\n doi = {10.1139/cjfas-2014-0433},\n journal = {Canadian Journal of Fisheries and Aquatic Sciences},\n number = {5}\n}
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\n\n\n
\n The Sacramento splittail (Pogonichthys macrolepidotus) is a relatively large (400 mm), long-lived (8 years) demersal cyprinid of conservation importance endemic to the San Francisco Estuary (SFE), California, USA. It exhibits a semi-anadromous life cycle spending adult life in low to moderate salinity (0-12) habitat with migrations into upstream freshwater rivers and floodplains for spawning during winter-spring. The species persists as two genetically distinguishable populations - one dominant and one subordinate - separated by discrete spawning habitats that we suggest resemble an island-mainland metapopulation structure. The populations overlap in distribution in the SFE, yet segregation is maintained with individuals tending to aggregate or school with others of similar population heritage and natal origin. The populations are spatially connected via dispersal of the dominant population into the subordinate population's spawning habitat when climate patterns produce freshwater outflow sufficient to form a bridge of suitable low salinity habitat across the upper SFE. Habitat affinities of the two populations, hydrodynamic modeling studies, and historical outflow records together suggest such conditions occur in approximately 1/3 of years overall with an irregular frequency. This dynamic pattern of spatial connectivity controlled by climate variability may be an important driver of gene flow between the two populations.\n
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\n \n\n \n \n \n \n \n \n Contaminant and food limitation stress in an endangered estuarine fish.\n \n \n \n \n\n\n \n Hammock, B., G.; Hobbs, J., A.; Slater, S., B.; Acuña, S.; and Teh, S., J.\n\n\n \n\n\n\n Science of The Total Environment, 532: 316-326. 11 2015.\n \n\n\n\n
\n\n\n\n \n \n \"ContaminantWebsite\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\n\n
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@article{\n title = {Contaminant and food limitation stress in an endangered estuarine fish},\n type = {article},\n year = {2015},\n keywords = {Animals,Biomarker,Chemical,Chemical: analysis,Conservation,Delta Smelt,Endangered Species,Environmental Monitoring,Estuaries,Hypomesus transpacificus,Osmeriformes,Partial migration,Physiological,San Francisco,San Francisco Estuary,Stress,Water Pollutants},\n pages = {316-326},\n volume = {532},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84936767194&partnerID=tZOtx3y1,http://linkinghub.elsevier.com/retrieve/pii/S0048969715302151},\n month = {11},\n publisher = {Elsevier B.V.},\n day = {1},\n id = {ae13dee9-f332-3937-96c9-b187e386471d},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hammock2015a},\n private_publication = {false},\n abstract = {The abundance of Delta Smelt (Hypomesus transpacificus), a fish species endemic to the upper San Francisco Estuary (SFE), is declining. Several causes for the population decline have been proposed, including food limitation and contaminant effects. Here, using juvenile Delta Smelt collected from throughout their range, we measured a suite of indices across three levels of biological organization (cellular, organ, individual) that reflect fish condition at temporal scales ranging from hours to weeks. Using these indices, the relative conditions of fish collected from five regions in the SFE were compared: Cache Slough, Sacramento River Deep Water Ship Channel, Confluence, Suisun Bay and Suisun Marsh. Fish sampled from Suisun Bay and, to a lesser extent the Confluence, exhibited relatively poor short-term nutritional and growth indices and morphometric condition, while fish from the freshwater regions of the estuary, and Cache Slough in particular, exhibited the most apparent histopathological signs of contaminant exposure. In contrast, fish from the Suisun Marsh region exhibited higher short-term nutrition and growth indices, and better morphometric and histopathological condition. For instance, fish collected from Suisun Marsh had a mean stomach fullness, expressed as a percentage of fish weight, that was 3.4-fold higher than fish collected from Suisun Bay, while also exhibiting an incidence of histopathological lesions that was 11-fold lower than fish collected from Cache Slough. Thus, our findings support the hypothesis that multiple stressors, including food limitation and contaminants, are contributing to the decline of Delta Smelt, and that these stressors influence Delta Smelt heterogeneously across space.},\n bibtype = {article},\n author = {Hammock, Bruce G. and Hobbs, James A. and Slater, Steven B. and Acuña, Shawn and Teh, Swee J.},\n doi = {10.1016/j.scitotenv.2015.06.018},\n journal = {Science of The Total Environment}\n}
\n
\n\n\n
\n The abundance of Delta Smelt (Hypomesus transpacificus), a fish species endemic to the upper San Francisco Estuary (SFE), is declining. Several causes for the population decline have been proposed, including food limitation and contaminant effects. Here, using juvenile Delta Smelt collected from throughout their range, we measured a suite of indices across three levels of biological organization (cellular, organ, individual) that reflect fish condition at temporal scales ranging from hours to weeks. Using these indices, the relative conditions of fish collected from five regions in the SFE were compared: Cache Slough, Sacramento River Deep Water Ship Channel, Confluence, Suisun Bay and Suisun Marsh. Fish sampled from Suisun Bay and, to a lesser extent the Confluence, exhibited relatively poor short-term nutritional and growth indices and morphometric condition, while fish from the freshwater regions of the estuary, and Cache Slough in particular, exhibited the most apparent histopathological signs of contaminant exposure. In contrast, fish from the Suisun Marsh region exhibited higher short-term nutrition and growth indices, and better morphometric and histopathological condition. For instance, fish collected from Suisun Marsh had a mean stomach fullness, expressed as a percentage of fish weight, that was 3.4-fold higher than fish collected from Suisun Bay, while also exhibiting an incidence of histopathological lesions that was 11-fold lower than fish collected from Cache Slough. Thus, our findings support the hypothesis that multiple stressors, including food limitation and contaminants, are contributing to the decline of Delta Smelt, and that these stressors influence Delta Smelt heterogeneously across space.\n
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\n \n\n \n \n \n \n \n \n Movement patterns and dispersal potential of Pecos bluntnose shiner ( Notropis simus pecosensis ) revealed using otolith microchemistry.\n \n \n \n \n\n\n \n Chase, N., M.; Caldwell, C., A.; Carleton, S., A.; Gould, W., R.; and Hobbs, J., A.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences, 72(10): 1575-1583. 10 2015.\n \n\n\n\n
\n\n\n\n \n \n \"MovementWebsite\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 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{\n title = {Movement patterns and dispersal potential of Pecos bluntnose shiner ( Notropis simus pecosensis ) revealed using otolith microchemistry},\n type = {article},\n year = {2015},\n pages = {1575-1583},\n volume = {72},\n websites = {http://www.nrcresearchpress.com/doi/10.1139/cjfas-2014-0574},\n month = {10},\n publisher = {National Research Council of Canada},\n id = {f28e2fc2-81ee-3ab9-a496-763e5791a129},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Chase2015},\n private_publication = {false},\n abstract = {Natal origin and dispersal potential of the federally threatened Pecos bluntnose shiner Notropis simus pecosensis were successfully characterized using otolith microchemistry and swimming performance trials. Strontium isotope ratios (87Sr:86Sr) of otoliths within the resident plains killifish Fundulus zebrinus were successfully used as a surrogate for strontium isotope ratios in water and revealed three isotopically distinct reaches throughout 297 km of the Pecos River, New Mexico, USA. Two different life history movement patterns were revealed in Pecos bluntnose shiner. Eggs and fry were either retained in upper river reaches or passively dispersed downriver and followed by upriver movement during the first year of life with some fish achieving a minimum movement of 56 km. Swimming ability of Pecos bluntnose shiner confirmed upper critical swimming speeds (Ucrit) as high as 43.8 cm.s-1 and 20.6 body lengths.s-1 in 30 d post-hatch fish. Strong swimming ability early in life supports our observations of up...},\n bibtype = {article},\n author = {Chase, Nathan M. and Caldwell, Colleen A. and Carleton, Scott A. and Gould, William R. and Hobbs, James A.},\n doi = {10.1139/cjfas-2014-0574},\n journal = {Canadian Journal of Fisheries and Aquatic Sciences},\n number = {10}\n}
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\n Natal origin and dispersal potential of the federally threatened Pecos bluntnose shiner Notropis simus pecosensis were successfully characterized using otolith microchemistry and swimming performance trials. Strontium isotope ratios (87Sr:86Sr) of otoliths within the resident plains killifish Fundulus zebrinus were successfully used as a surrogate for strontium isotope ratios in water and revealed three isotopically distinct reaches throughout 297 km of the Pecos River, New Mexico, USA. Two different life history movement patterns were revealed in Pecos bluntnose shiner. Eggs and fry were either retained in upper river reaches or passively dispersed downriver and followed by upriver movement during the first year of life with some fish achieving a minimum movement of 56 km. Swimming ability of Pecos bluntnose shiner confirmed upper critical swimming speeds (Ucrit) as high as 43.8 cm.s-1 and 20.6 body lengths.s-1 in 30 d post-hatch fish. Strong swimming ability early in life supports our observations of up...\n
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\n  \n 2013\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Resident rainbow trout produce anadromous offspring in a large interior watershed.\n \n \n \n \n\n\n \n Courter, I., I.; Child, D., B.; Hobbs, J., A.; Garrison, T., M.; Glessner, J., J.; and Duery, S.\n\n\n \n\n\n\n Canadian Journal of Fisheries and Aquatic Sciences, 70(5): 701-710. 5 2013.\n \n\n\n\n
\n\n\n\n \n \n \"ResidentWebsite\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{\n title = {Resident rainbow trout produce anadromous offspring in a large interior watershed},\n type = {article},\n year = {2013},\n pages = {701-710},\n volume = {70},\n websites = {http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2012-0457,http://www.scopus.com/inward/record.url?eid=2-s2.0-84877814064&partnerID=tZOtx3y1},\n month = {5},\n id = {f73971ae-8809-31f5-a7eb-ce2705438a7d},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Courter2013},\n private_publication = {false},\n abstract = {Rainbow trout (Oncorhynchus mykiss) have diverse life histories, including both freshwater-resident and anadromous “steelhead” life-history forms. Here, we demonstrate that female resident rainbow trout produce anadromous offspring that survive and return to spawn as adult steelhead. This study represents the first successful attempt to quantify steelhead produc- tion rates from female resident rainbow trout across a large watershed. Otolith microchemistry (87Sr/86Sr) techniques were used to determine the maternal life history (resident or anadromous) of 498 emigrating steelhead kelts in the Yakima Basin, Washington. Five geochemically distinct freshwater rearing regions were identified within the basin. All five regions were predicted to produce steelhead with resident maternal life histories. Basin-wide, 20% and 7% of steelhead collected in 2010 and 2011, respectively, had resident maternal life histories. Cross-life-history form production may be critical to persistence of anadromous life histories within partially anadromous salmonid populations, particularly in areas where anadromous fish abundance is low due to natural or anthropogenic influences. Résumé},\n bibtype = {article},\n author = {Courter, Ian I. and Child, David B. and Hobbs, James A. and Garrison, Thomas M. and Glessner, Justin J.G. and Duery, Shadia},\n doi = {10.1139/cjfas-2012-0457},\n journal = {Canadian Journal of Fisheries and Aquatic Sciences},\n number = {5}\n}
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\n Rainbow trout (Oncorhynchus mykiss) have diverse life histories, including both freshwater-resident and anadromous “steelhead” life-history forms. Here, we demonstrate that female resident rainbow trout produce anadromous offspring that survive and return to spawn as adult steelhead. This study represents the first successful attempt to quantify steelhead produc- tion rates from female resident rainbow trout across a large watershed. Otolith microchemistry (87Sr/86Sr) techniques were used to determine the maternal life history (resident or anadromous) of 498 emigrating steelhead kelts in the Yakima Basin, Washington. Five geochemically distinct freshwater rearing regions were identified within the basin. All five regions were predicted to produce steelhead with resident maternal life histories. Basin-wide, 20% and 7% of steelhead collected in 2010 and 2011, respectively, had resident maternal life histories. Cross-life-history form production may be critical to persistence of anadromous life histories within partially anadromous salmonid populations, particularly in areas where anadromous fish abundance is low due to natural or anthropogenic influences. Résumé\n
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\n \n\n \n \n \n \n \n \n From 'omics to otoliths: responses of an estuarine fish to endocrine disrupting compounds across biological scales.\n \n \n \n \n\n\n \n Brander, S., M.; Connon, R., E.; He, G.; Hobbs, J., A.; Smalling, K., L.; Teh, S., J.; White, J., W.; Werner, I.; Denison, M., S.; and Cherr, G., N.\n\n\n \n\n\n\n PloS one, 8(9): e74251. 1 2013.\n \n\n\n\n
\n\n\n\n \n \n \"FromWebsite\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{\n title = {From 'omics to otoliths: responses of an estuarine fish to endocrine disrupting compounds across biological scales.},\n type = {article},\n year = {2013},\n keywords = {Animals,Base Sequence,Body Size,DNA Primers,Endocrine Disruptors,Endocrine Disruptors: toxicity,Estuaries,Female,Fishes,Gene Expression,Male,Real-Time Polymerase Chain Reaction,Sex Ratio},\n pages = {e74251},\n volume = {8},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84884582618&partnerID=tZOtx3y1},\n month = {1},\n id = {95e8812c-31d8-3869-b9b0-41d3aaa4b0b6},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-02-26},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Brander2013},\n private_publication = {false},\n abstract = {Endocrine disrupting chemicals (EDCs) cause physiological abnormalities and population decline in fishes. However, few studies have linked environmental EDC exposures with responses at multiple tiers of the biological hierarchy, including population-level effects. To this end, we undertook a four-tiered investigation in the impacted San Francisco Bay estuary with the Mississippi silverside (Menidia audens), a small pelagic fish. This approach demonstrated links between different EDC sources and fish responses at different levels of biological organization. First we determined that water from a study site primarily impacted by ranch run-off had only estrogenic activity in vitro, while water sampled from a site receiving a combination of urban, limited ranch run-off, and treated wastewater effluent had both estrogenic and androgenic activity. Secondly, at the molecular level we found that fish had higher mRNA levels for estrogen-responsive genes at the site where only estrogenic activity was detected but relatively lower expression levels where both estrogenic and androgenic EDCs were detected. Thirdly, at the organism level, males at the site exposed to both estrogens and androgens had significantly lower mean gonadal somatic indices, significantly higher incidence of severe testicular necrosis and altered somatic growth relative to the site where only estrogens were detected. Finally, at the population level, the sex ratio was significantly skewed towards males at the site with measured androgenic and estrogenic activity. Our results suggest that mixtures of androgenic and estrogenic EDCs have antagonistic and potentially additive effects depending on the biological scale being assessed, and that mixtures containing androgens and estrogens may produce unexpected effects. In summary, evaluating EDC response at multiple tiers is necessary to determine the source of disruption (lowest scale, i.e. cell line) and what the ecological impact will be (largest scale, i.e. sex ratio).},\n bibtype = {article},\n author = {Brander, Susanne M and Connon, Richard E and He, Guochun and Hobbs, James A and Smalling, Kelly L and Teh, Swee J and White, J Wilson and Werner, Inge and Denison, Michael S and Cherr, Gary N},\n doi = {10.1371/journal.pone.0074251},\n journal = {PloS one},\n number = {9}\n}
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\n Endocrine disrupting chemicals (EDCs) cause physiological abnormalities and population decline in fishes. However, few studies have linked environmental EDC exposures with responses at multiple tiers of the biological hierarchy, including population-level effects. To this end, we undertook a four-tiered investigation in the impacted San Francisco Bay estuary with the Mississippi silverside (Menidia audens), a small pelagic fish. This approach demonstrated links between different EDC sources and fish responses at different levels of biological organization. First we determined that water from a study site primarily impacted by ranch run-off had only estrogenic activity in vitro, while water sampled from a site receiving a combination of urban, limited ranch run-off, and treated wastewater effluent had both estrogenic and androgenic activity. Secondly, at the molecular level we found that fish had higher mRNA levels for estrogen-responsive genes at the site where only estrogenic activity was detected but relatively lower expression levels where both estrogenic and androgenic EDCs were detected. Thirdly, at the organism level, males at the site exposed to both estrogens and androgens had significantly lower mean gonadal somatic indices, significantly higher incidence of severe testicular necrosis and altered somatic growth relative to the site where only estrogens were detected. Finally, at the population level, the sex ratio was significantly skewed towards males at the site with measured androgenic and estrogenic activity. Our results suggest that mixtures of androgenic and estrogenic EDCs have antagonistic and potentially additive effects depending on the biological scale being assessed, and that mixtures containing androgens and estrogens may produce unexpected effects. In summary, evaluating EDC response at multiple tiers is necessary to determine the source of disruption (lowest scale, i.e. cell line) and what the ecological impact will be (largest scale, i.e. sex ratio).\n
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\n  \n 2012\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Tagging the next generation: validation of trans-generational chemical tagging for an endangered fish.\n \n \n \n \n\n\n \n Hobbs, J., A.; Castillo, G.; Tigan, G.; Lindberg, J.; Ikemiyagi, N.; and Ramos, G.\n\n\n \n\n\n\n Environmental Biology of Fishes, 95(4): 463-468. 5 2012.\n \n\n\n\n
\n\n\n\n \n \n \"TaggingWebsite\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{\n title = {Tagging the next generation: validation of trans-generational chemical tagging for an endangered fish},\n type = {article},\n year = {2012},\n keywords = {Delta smelt,Laser ablation,Microchemistry,Otolith,Trans-generational chemical tag},\n pages = {463-468},\n volume = {95},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84868206999&partnerID=tZOtx3y1},\n month = {5},\n day = {10},\n id = {a2f3bd50-e333-304b-95ff-31e8d3ae2864},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2012},\n private_publication = {false},\n abstract = {In this study we validated marking offspring through peritoneal injection of ripe females using two concentrations of strontium (strontium chloride hexahydrate). Larvae from treatments were monitored for condition morphometrics and tested for chemical mark incorporation in their otoliths via laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) to quantify the strontium concentration (Sr/Ca) and laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) to measure the strontium isotope ratios ( 87Sr: 86Sr) of otoliths. Otolith strontium concentrations and strontium isotopes ratios were elevated in the high-concentration treatment, while the low-concentration and control treatments were not significantly different from each other. Larval size and eye diameter at hatch were similar among treatments; however, yolk and oil globule diameters were significantly reduced in the high-concentration treatment. Moreover, growth rates after 60 days post-hatch were significantly reduced in the high-concentration treatment relative to the low-concentration and control treatments, suggesting trans-generational tagging can have deleterious effects on offspring. Our study provides evidence for the efficacy of artificially marking offspring via injection of strontium into ripe females and could provide new tools for managing endangered fish populations; however, careful consideration of chemical concentrations and dosages may be required prior to its application in a fisheries management experiment. © 2012 Springer Science+Business Media B.V.},\n bibtype = {article},\n author = {Hobbs, James A. and Castillo, Gonzalo and Tigan, Galen and Lindberg, Joan and Ikemiyagi, Naoaki and Ramos, Georgia},\n doi = {10.1007/s10641-012-0034-1},\n journal = {Environmental Biology of Fishes},\n number = {4}\n}
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\n In this study we validated marking offspring through peritoneal injection of ripe females using two concentrations of strontium (strontium chloride hexahydrate). Larvae from treatments were monitored for condition morphometrics and tested for chemical mark incorporation in their otoliths via laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) to quantify the strontium concentration (Sr/Ca) and laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) to measure the strontium isotope ratios ( 87Sr: 86Sr) of otoliths. Otolith strontium concentrations and strontium isotopes ratios were elevated in the high-concentration treatment, while the low-concentration and control treatments were not significantly different from each other. Larval size and eye diameter at hatch were similar among treatments; however, yolk and oil globule diameters were significantly reduced in the high-concentration treatment. Moreover, growth rates after 60 days post-hatch were significantly reduced in the high-concentration treatment relative to the low-concentration and control treatments, suggesting trans-generational tagging can have deleterious effects on offspring. Our study provides evidence for the efficacy of artificially marking offspring via injection of strontium into ripe females and could provide new tools for managing endangered fish populations; however, careful consideration of chemical concentrations and dosages may be required prior to its application in a fisheries management experiment. © 2012 Springer Science+Business Media B.V.\n
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\n \n\n \n \n \n \n \n Pre-screen loss and fish facility efficiency for delta smelt at the south delta's State Water Project, California.\n \n \n \n\n\n \n Castillo, G.; Morinaka, J.; Lindberg, J.; Fujimura, R.; Baskerville-Bridges, B.; Hobbs, J.; Tigan, G.; and Ellison, L.\n\n\n \n\n\n\n San Fransico Estuary and Watershed Science, 10(4): 23. 2012.\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
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@article{\n title = {Pre-screen loss and fish facility efficiency for delta smelt at the south delta's State Water Project, California},\n type = {article},\n year = {2012},\n pages = {23},\n volume = {10},\n id = {eb11127f-f5ad-37c4-9bf7-444ff8b4b826},\n created = {2018-07-16T19:24:50.747Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2018-07-16T19:24:50.747Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Water exports have been implicated in the decline of fish populations in the upper San Francisco Estuary, California. We evaluated the relation between delta smelt salvage at the John E. Skinner Delta Fish Protective Facility (SFF) and underlying entrainment losses at the State Water Project (SWP, south Delta). We used cultured delta smelt in mark–recapture experiments in February and March 2009 (adults) and June 2009 (juveniles) to estimate: (1) the percent of fish recaptured at the SFF of the total released at the entrance of the SFF (fish facility efficiency), (2) the percent of fish recaptured at the SFF of the total released in Clifton Court Forebay (CCF), a reservoir for SWP exports, and (3) the fish losses in CCF and before the SFF (pre-screen loss). Mean fish facility efficiency was lower in successive releases: February (53.2%), March (44.0%) and June (24.0%). The mean percent recapture of fish released at the CCF entrance was also lower over time: February (3.01%); March (0.41%) and June (0.03%). Correspondingly higher mean pre-screen losses occurred over time: February (94.3%); March (99.1%) and June (99.9%). We concluded that: (1) entrainment losses of delta smelt could be higher at times, compared to other species previously studied at the SWP; (2) pre-screen loss was the largest source of mortality for delta smelt; (3) increased release distance from the SFF and residence time in CCF—and decreased exports—resulted in a lower percentage of recaptured fish at the SFF; and (4) salvage of delta smelt at the SWP does not seem to be a consistent index of entrainment.},\n bibtype = {article},\n author = {Castillo, Gonzalo and Morinaka, Jerry and Lindberg, Joan and Fujimura, Robert and Baskerville-Bridges, Bradd and Hobbs, James and Tigan, Galen and Ellison, Luke},\n doi = {10.5811/westjem.2011.5.6700},\n journal = {San Fransico Estuary and Watershed Science},\n number = {4}\n}
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\n Water exports have been implicated in the decline of fish populations in the upper San Francisco Estuary, California. We evaluated the relation between delta smelt salvage at the John E. Skinner Delta Fish Protective Facility (SFF) and underlying entrainment losses at the State Water Project (SWP, south Delta). We used cultured delta smelt in mark–recapture experiments in February and March 2009 (adults) and June 2009 (juveniles) to estimate: (1) the percent of fish recaptured at the SFF of the total released at the entrance of the SFF (fish facility efficiency), (2) the percent of fish recaptured at the SFF of the total released in Clifton Court Forebay (CCF), a reservoir for SWP exports, and (3) the fish losses in CCF and before the SFF (pre-screen loss). Mean fish facility efficiency was lower in successive releases: February (53.2%), March (44.0%) and June (24.0%). The mean percent recapture of fish released at the CCF entrance was also lower over time: February (3.01%); March (0.41%) and June (0.03%). Correspondingly higher mean pre-screen losses occurred over time: February (94.3%); March (99.1%) and June (99.9%). We concluded that: (1) entrainment losses of delta smelt could be higher at times, compared to other species previously studied at the SWP; (2) pre-screen loss was the largest source of mortality for delta smelt; (3) increased release distance from the SFF and residence time in CCF—and decreased exports—resulted in a lower percentage of recaptured fish at the SFF; and (4) salvage of delta smelt at the SWP does not seem to be a consistent index of entrainment.\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 The use of otolith strontium isotopes (87Sr/86Sr) to identify nursery habitat for a threatened estuarine fish.\n \n \n \n \n\n\n \n Hobbs, J., A.; Lewis, L., S.; Ikemiyagi, N.; Sommer, T.; and Baxter, R., D.\n\n\n \n\n\n\n Environmental Biology of Fishes, 89(3-4): 557-569. 11 2010.\n \n\n\n\n
\n\n\n\n \n \n \"TheWebsite\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{\n title = {The use of otolith strontium isotopes (87Sr/86Sr) to identify nursery habitat for a threatened estuarine fish},\n type = {article},\n year = {2010},\n keywords = {otolith},\n pages = {557-569},\n volume = {89},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-78149409171&partnerID=tZOtx3y1,http://link.springer.com/10.1007/s10641-010-9672-3},\n month = {11},\n day = {24},\n id = {13416f6b-ab50-3a4c-9926-f0c08672846e},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2010},\n private_publication = {false},\n abstract = {Nursery habitats are larval or juvenile habitats that disproportionately contribute individuals to adult populations of a species. Identifying and protecting such habitats is important to species conservation, yet evaluating the relative contributions of different larval habitats to adult fish populations has proven difficult at best. Otolith geochemistry is one available tool for reconstructing previous habitat use of adult fishes during the early life history, thus facilitating the identification of nursery habitats. In this study, we compared traditional catch surveys of larval-stage longfin smelt (Spirinchus thaleichthys) occurring in habitats of different salinities to corresponding larval-stage salinity distributions of sub-adult/adult longfin smelt estimated using otolith geochemical techniques. This allowed us to evaluate the relative contribution of larvae from waters of various salinities to sub-adult/adult populations of longfin smelt. We used laser ablation MC-ICP-MS on otoliths and an empirically-derived relationship between strontium isotope ratios (87Sr/86Sr) of waters across the estuarine salinity gradient to reconstruct the larval salinity history of longfin smelt. Salinity values from the larval region of sub-adult/adult otoliths (corresponding to standard lengths of ca.10-mm) were compared to corresponding catch distribution of larval longfin smelt (≤ 10-mm) from 4 year-classes (1999, 2000, 2003 and 2006) in the San Francisco Estuary spanning a period when the population underwent a dramatic decline. Though the catch distribution of larval-stage longfin smelt was centered around 4-ppt and did not vary significantly among years, salinity distributions of sub-adult/adult were lower and narrower (ca. 2-ppt), suggesting that low- salinity habitats disproportionally contributed more recruits relative to both freshwater and brackish water habitats and, therefore, may function as important nursery areas. Furthermore, the relative importance of the low salinity zone (ca. 2-ppt) to successful recruitment appeared greatest in years following the longfin smelt population decline. Our results indicate that otolith strontium isotopes (87Sr/86Sr) are a powerful tool for identifying nursery habitats for estuarine fishes.},\n bibtype = {article},\n author = {Hobbs, James A. and Lewis, Levi S. and Ikemiyagi, Naoaki and Sommer, Ted and Baxter, Randall D.},\n doi = {10.1007/s10641-010-9672-3},\n journal = {Environmental Biology of Fishes},\n number = {3-4}\n}
\n
\n\n\n
\n Nursery habitats are larval or juvenile habitats that disproportionately contribute individuals to adult populations of a species. Identifying and protecting such habitats is important to species conservation, yet evaluating the relative contributions of different larval habitats to adult fish populations has proven difficult at best. Otolith geochemistry is one available tool for reconstructing previous habitat use of adult fishes during the early life history, thus facilitating the identification of nursery habitats. In this study, we compared traditional catch surveys of larval-stage longfin smelt (Spirinchus thaleichthys) occurring in habitats of different salinities to corresponding larval-stage salinity distributions of sub-adult/adult longfin smelt estimated using otolith geochemical techniques. This allowed us to evaluate the relative contribution of larvae from waters of various salinities to sub-adult/adult populations of longfin smelt. We used laser ablation MC-ICP-MS on otoliths and an empirically-derived relationship between strontium isotope ratios (87Sr/86Sr) of waters across the estuarine salinity gradient to reconstruct the larval salinity history of longfin smelt. Salinity values from the larval region of sub-adult/adult otoliths (corresponding to standard lengths of ca.10-mm) were compared to corresponding catch distribution of larval longfin smelt (≤ 10-mm) from 4 year-classes (1999, 2000, 2003 and 2006) in the San Francisco Estuary spanning a period when the population underwent a dramatic decline. Though the catch distribution of larval-stage longfin smelt was centered around 4-ppt and did not vary significantly among years, salinity distributions of sub-adult/adult were lower and narrower (ca. 2-ppt), suggesting that low- salinity habitats disproportionally contributed more recruits relative to both freshwater and brackish water habitats and, therefore, may function as important nursery areas. Furthermore, the relative importance of the low salinity zone (ca. 2-ppt) to successful recruitment appeared greatest in years following the longfin smelt population decline. Our results indicate that otolith strontium isotopes (87Sr/86Sr) are a powerful tool for identifying nursery habitats for estuarine fishes.\n
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\n \n\n \n \n \n \n \n Salinity Inhabited by Age-0 Splittail (Pogonichthys macrolepidotus) as Determined by Direct Field Observation and Retrospective Analyses with Otolith Chemistry.\n \n \n \n\n\n \n Feyrer, F.; Hobbs, J., A.; and Sommer, T.\n\n\n \n\n\n\n San Francisco Estuary and Watershed Science, 2(8). 4 2010.\n \n\n\n\n
\n\n\n\n \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 \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \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{\n title = {Salinity Inhabited by Age-0 Splittail (Pogonichthys macrolepidotus) as Determined by Direct Field Observation and Retrospective Analyses with Otolith Chemistry.},\n type = {article},\n year = {2010},\n keywords = {Biosphere reserve,Buffer zone,Green space,Health complaints,Indonesia,Management effectiveness,Mental health,Nature,Protected area,Remote sensing,Restorative environments,Stress-buffering effects,Stressful life events,The Netherlands,anthropogenic factors,authority,biodiversity,biological or radioactive level,buffer zone,buffer zone management,chemical,construction industry,directly or indirectly related,environmental management,foreign languages,green engineering,guidelines,implementation,in any part of,introductory curriculum,land use,landfill rehabilitation,local,multiliteracies,nox and sox,pedagogy,plant rescue unit,prunit,reforestation,social forestry,stone cancer,sustainability,tanjong malim,temperature,the,to the physical properties},\n volume = {2},\n month = {4},\n id = {54c6d96a-bb0a-376d-bee2-3519760f5014},\n created = {2016-10-22T02:52:24.000Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Feyrer2010},\n private_publication = {false},\n bibtype = {article},\n author = {Feyrer, Frederick and Hobbs, James A. and Sommer, Ted},\n journal = {San Francisco Estuary and Watershed Science},\n number = {8}\n}
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\n
\n  \n 2009\n \n \n (2)\n \n \n
\n
\n \n \n
\n \n\n \n \n \n \n \n \n Likely Population-Level Effects of Contaminants on a Resident Estuarine Fish Species: Comparing Gillichthys mirabilis Population Static Measurements and Vital Rates in San Francisco and Tomales Bays.\n \n \n \n \n\n\n \n McGourty, C., R.; Hobbs, J., A.; Bennett, W., A.; Green, P., G.; Hwang, H.; Ikemiyagi, N.; Lewis, L.; and Cope, J., M.\n\n\n \n\n\n\n Estuaries and Coasts, 32(6): 1111-1120. 8 2009.\n \n\n\n\n
\n\n\n\n \n \n \"LikelyWebsite\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
@article{\n title = {Likely Population-Level Effects of Contaminants on a Resident Estuarine Fish Species: Comparing Gillichthys mirabilis Population Static Measurements and Vital Rates in San Francisco and Tomales Bays},\n type = {article},\n year = {2009},\n keywords = {Age and growth,Contaminants,Gillichthys mirabilis,Mortality,Recruitment},\n pages = {1111-1120},\n volume = {32},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70449569389&partnerID=tZOtx3y1},\n month = {8},\n day = {6},\n id = {25ba0202-138a-360a-94eb-caf2a0102a75},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {McGourty2009},\n private_publication = {false},\n abstract = {Gillichthys mirabilis population static measurements (abundance, age, and size class structures) and vital rates (growth, mortality, recruitment) were monitored on an annual basis from 2002 to 2007. Population-level metrics were used to gauge habitat quality at two study sites (a contaminated site and a reference site) in two large northern California estuaries (San Francisco and Tomales Bays). San Francisco Bay populations exhibited slower growth and higher mortality rates and contained higher amounts of contaminants than Tomales Bay. Recruitment rates were highest at contaminated sites (Stege Marsh and Walker Creek) in 3 years out of 5 years, suggesting low adult survival. This study suggests that population-level effects on a residential fish may be attributed to estuarine contamination on the US Pacific coast. © The Author(s) 2009.},\n bibtype = {article},\n author = {McGourty, Catherine R. and Hobbs, James A. and Bennett, William A. and Green, Peter G. and Hwang, Hyun-Min and Ikemiyagi, Naoaki and Lewis, Levi and Cope, Jason M.},\n doi = {10.1007/s12237-009-9177-5},\n journal = {Estuaries and Coasts},\n number = {6}\n}
\n
\n\n\n
\n Gillichthys mirabilis population static measurements (abundance, age, and size class structures) and vital rates (growth, mortality, recruitment) were monitored on an annual basis from 2002 to 2007. Population-level metrics were used to gauge habitat quality at two study sites (a contaminated site and a reference site) in two large northern California estuaries (San Francisco and Tomales Bays). San Francisco Bay populations exhibited slower growth and higher mortality rates and contained higher amounts of contaminants than Tomales Bay. Recruitment rates were highest at contaminated sites (Stege Marsh and Walker Creek) in 3 years out of 5 years, suggesting low adult survival. This study suggests that population-level effects on a residential fish may be attributed to estuarine contamination on the US Pacific coast. © The Author(s) 2009.\n
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\n\n\n
\n \n\n \n \n \n \n \n \n Using Trace Elements in Pectoral Fin Rays to Assess Life History Movements in Sturgeon: Estimating Age at Initial Seawater Entry in Klamath River Green Sturgeon.\n \n \n \n \n\n\n \n Allen, P., J.; Hobbs, J., A.; Cech, J., J.; Van Eenennaam, J., P.; and Doroshov, S., I.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 138(2): 240-250. 3 2009.\n \n\n\n\n
\n\n\n\n \n \n \"UsingWebsite\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
@article{\n title = {Using Trace Elements in Pectoral Fin Rays to Assess Life History Movements in Sturgeon: Estimating Age at Initial Seawater Entry in Klamath River Green Sturgeon},\n type = {article},\n year = {2009},\n pages = {240-250},\n volume = {138},\n websites = {http://www.tandfonline.com/doi/abs/10.1577/T08-061.1\\nhttp://www.scopus.com/inward/record.url?eid=2-s2.0-70350182800&partnerID=tZOtx3y1,http://www.tandfonline.com/doi/abs/10.1577/T08-061.1,http://www.scopus.com/inward/record.url?eid=2-s2.0-70350182800&par},\n month = {3},\n id = {87234aab-f73d-3c19-b434-e0730c216f17},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Allen2009},\n private_publication = {false},\n abstract = {To investigate the timing of the initial entry of green sturgeon Acipenser medirostris into seawater, we examined the ratios of strontium and barium to calcium in pectoral fin rays via laser ablation– inductively coupled plasma–mass spectrometry. In a reference group of six hatchery fish that was reared 1–2 years in freshwater and 1–3 years in seawater, we found a significant increase in the Sr:Ca ratio, a decrease in the Ba:Ca ratio, and an increase in the Sr:Ba ratio in calcified growth zones during the transition from freshwater to seawater. In 10 wild adults captured in the Klamath River, California, combined evaluation of the Sr:Ca and Ba:Ca ratios provided a clearer understanding of fish movements than the Sr:Ba ratio, probably because wild fish have a more complex life history. The Ba:Ca ratio dropped significantly between growth zones 1 and 2 (ages 0.5–1.5), indicating a transition into saline waters, such as the Klamath River estuary. The Sr:Ca ratio increased slightly in the same location but attained the values found in reference fish held in seawater between growth zones 3 and 4 (ages 2.5–3.5). The Sr:Ca, Ba:Ca, and Sr:Ba ratios in growth zones 4– 6 (ages 4.5–6.5) of wild fish were similar to those found in reference fish held in seawater and corroborated the results of previous physiological studies as well as the limited field data. These results demonstrate the usefulness of trace element analyses of green sturgeon pectoral fin rays and confirm an early age of entry into seawater for this species.},\n bibtype = {article},\n author = {Allen, Peter J. and Hobbs, James A. and Cech, Joseph J. and Van Eenennaam, Joel P. and Doroshov, Serge I.},\n doi = {10.1577/T08-061.1},\n journal = {Transactions of the American Fisheries Society},\n number = {2}\n}
\n
\n\n\n
\n To investigate the timing of the initial entry of green sturgeon Acipenser medirostris into seawater, we examined the ratios of strontium and barium to calcium in pectoral fin rays via laser ablation– inductively coupled plasma–mass spectrometry. In a reference group of six hatchery fish that was reared 1–2 years in freshwater and 1–3 years in seawater, we found a significant increase in the Sr:Ca ratio, a decrease in the Ba:Ca ratio, and an increase in the Sr:Ba ratio in calcified growth zones during the transition from freshwater to seawater. In 10 wild adults captured in the Klamath River, California, combined evaluation of the Sr:Ca and Ba:Ca ratios provided a clearer understanding of fish movements than the Sr:Ba ratio, probably because wild fish have a more complex life history. The Ba:Ca ratio dropped significantly between growth zones 1 and 2 (ages 0.5–1.5), indicating a transition into saline waters, such as the Klamath River estuary. The Sr:Ca ratio increased slightly in the same location but attained the values found in reference fish held in seawater between growth zones 3 and 4 (ages 2.5–3.5). The Sr:Ca, Ba:Ca, and Sr:Ba ratios in growth zones 4– 6 (ages 4.5–6.5) of wild fish were similar to those found in reference fish held in seawater and corroborated the results of previous physiological studies as well as the limited field data. These results demonstrate the usefulness of trace element analyses of green sturgeon pectoral fin rays and confirm an early age of entry into seawater for this species.\n
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\n
\n  \n 2007\n \n \n (4)\n \n \n
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\n \n \n
\n \n\n \n \n \n \n \n \n Otolith Microchemistry Provides Information Complementary to Microsatellite DNA for a Migratory Fish.\n \n \n \n \n\n\n \n Feyrer, F.; Hobbs, J.; Baerwald, M.; Sommer, T.; Yin, Q.; Clark, K.; May, B.; and Bennett, W.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 136(2): 469-476. 3 2007.\n \n\n\n\n
\n\n\n\n \n \n \"OtolithWebsite\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
@article{\n title = {Otolith Microchemistry Provides Information Complementary to Microsatellite DNA for a Migratory Fish},\n type = {article},\n year = {2007},\n pages = {469-476},\n volume = {136},\n websites = {http://www.tandfonline.com/doi/abs/10.1577/T06-044.1,http://www.scopus.com/inward/record.url?eid=2-s2.0-34247192544&partnerID=tZOtx3y1},\n month = {3},\n id = {b9ab3cb1-2c4e-38e6-9845-eedbcd6e2033},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Feyrer2007},\n private_publication = {false},\n abstract = {We investigated the ability of otolith microchemistry to discriminate natal habitats of the splittail Pogonichthys macrolepidotus, a migratory cyprinid endemic to the San Francisco Estuary, California. Splittails are broadly distributed in the brackish and freshwater portions of the lower estuary and make long-distance upstream migrations during winter to rivers and floodplains for spawning. We found that the ratios of Sr:Ca and 87Sr: 86Sr in the otoliths (ascertained by laser ablation inductively coupled mass spectrometry) of age-0 fish collected from natal habitats significantly varied among four primary spawning rivers. Based on these two constituents, quadratic discriminant function analysis correctly classified 71% of the fish to their natal rivers. Recent work with microsatellite DNA indicates that splittails from these same rivers represent two genetically distinct populations. Thus, integrating data obtained from otolith microchemistry and microsatellite DNA can provide complementary information on the natal origin and genetic structure of splittails at any life stage. This information will be valuable for studies of the population dynamics of mixed-stock samples collected from the estuary. © Copyright by the American Fisheries Society 2007.},\n bibtype = {article},\n author = {Feyrer, Frederick and Hobbs, James and Baerwald, Melinda and Sommer, Ted and Yin, Qing-zhu and Clark, Kevin and May, Bernie and Bennett, William},\n doi = {10.1577/T06-044.1},\n journal = {Transactions of the American Fisheries Society},\n number = {2}\n}
\n
\n\n\n
\n We investigated the ability of otolith microchemistry to discriminate natal habitats of the splittail Pogonichthys macrolepidotus, a migratory cyprinid endemic to the San Francisco Estuary, California. Splittails are broadly distributed in the brackish and freshwater portions of the lower estuary and make long-distance upstream migrations during winter to rivers and floodplains for spawning. We found that the ratios of Sr:Ca and 87Sr: 86Sr in the otoliths (ascertained by laser ablation inductively coupled mass spectrometry) of age-0 fish collected from natal habitats significantly varied among four primary spawning rivers. Based on these two constituents, quadratic discriminant function analysis correctly classified 71% of the fish to their natal rivers. Recent work with microsatellite DNA indicates that splittails from these same rivers represent two genetically distinct populations. Thus, integrating data obtained from otolith microchemistry and microsatellite DNA can provide complementary information on the natal origin and genetic structure of splittails at any life stage. This information will be valuable for studies of the population dynamics of mixed-stock samples collected from the estuary. © Copyright by the American Fisheries Society 2007.\n
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\n \n\n \n \n \n \n \n \n Classification of Larval and Adult Delta Smelt to Nursery Areas by Use of Trace Elemental Fingerprinting.\n \n \n \n \n\n\n \n Hobbs, J., A.; Bennett, W., A.; Burton, J.; and Gras, M.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 136(2): 518-527. 3 2007.\n \n\n\n\n
\n\n\n\n \n \n \"ClassificationWebsite\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{\n title = {Classification of Larval and Adult Delta Smelt to Nursery Areas by Use of Trace Elemental Fingerprinting},\n type = {article},\n year = {2007},\n keywords = {1072954 registered,14,17 july 2015,27,at,by,england and wales registered,francis,informa ltd registered in,number,on,publisher,s article was downloaded,taylor,university of california davis},\n pages = {518-527},\n volume = {136},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-34247188572&partnerID=tZOtx3y1,http://www.tandfonline.com/doi/abs/10.1577/T06-087.1},\n month = {3},\n id = {540c72b3-11db-3b61-92cf-9b90bab9c9b4},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2007},\n private_publication = {false},\n abstract = {Different environmental conditions among habitats may generate unique elemental patterns within fish otoliths that can be used to trace the life history as well as the potential natal origin of migratory species. We investigated the use of trace elements in otoliths as natural tags for determining the natal origins of larval and adult delta smelt Hypomesus transpacificus within a single estuary. Larval fish were collected at potential natal sites within the San Francisco Bay Estuary—the North, Central, South, and West Delta areas, Suisun Bay, and Napa River—during May–June 1999; adults were collected in November 1999 throughout Suisun Bay. Using laser ablation inductively coupled plasma mass spectrometry, we assayed trace elements from core (natal) regions of the otolith (Sr:Ca, Mg:Ca, and Ba:Ca ratios). Linear discriminant function analysis (LDFA) was 90.9–100% successful at classifying larval fish to their natal habitats (Napa River, Sacramento River, and Delta). Adults of unknown natal origin were assigned to their natal regions using the larval fingerprints from LDFA and a maximum likelihood mixed-stock approach. For the 1999 year-class, we determined that a majority of the population originated from the Delta (77–79%) and a small but significant proportion of the population originated from the Napa River (16–18%) and Suisun Bay (4–8%). These data highlight the value of trace elements as natural tags for determining the natal origins of young fish and the relative contribution of different habitats to the adult population within a single estuary.},\n bibtype = {article},\n author = {Hobbs, James A. and Bennett, William A. and Burton, Jessica and Gras, Michelle},\n doi = {10.1577/T06-087.1},\n journal = {Transactions of the American Fisheries Society},\n number = {2}\n}
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\n Different environmental conditions among habitats may generate unique elemental patterns within fish otoliths that can be used to trace the life history as well as the potential natal origin of migratory species. We investigated the use of trace elements in otoliths as natural tags for determining the natal origins of larval and adult delta smelt Hypomesus transpacificus within a single estuary. Larval fish were collected at potential natal sites within the San Francisco Bay Estuary—the North, Central, South, and West Delta areas, Suisun Bay, and Napa River—during May–June 1999; adults were collected in November 1999 throughout Suisun Bay. Using laser ablation inductively coupled plasma mass spectrometry, we assayed trace elements from core (natal) regions of the otolith (Sr:Ca, Mg:Ca, and Ba:Ca ratios). Linear discriminant function analysis (LDFA) was 90.9–100% successful at classifying larval fish to their natal habitats (Napa River, Sacramento River, and Delta). Adults of unknown natal origin were assigned to their natal regions using the larval fingerprints from LDFA and a maximum likelihood mixed-stock approach. For the 1999 year-class, we determined that a majority of the population originated from the Delta (77–79%) and a small but significant proportion of the population originated from the Napa River (16–18%) and Suisun Bay (4–8%). These data highlight the value of trace elements as natural tags for determining the natal origins of young fish and the relative contribution of different habitats to the adult population within a single estuary.\n
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\n \n\n \n \n \n \n \n \n Living in a Dynamic Environment: Variability in Life History Traits of Age-0 Splittail in Tributaries of San Francisco Bay.\n \n \n \n \n\n\n \n Feyrer, F.; Sommer, T.; and Hobbs, J.\n\n\n \n\n\n\n Transactions of the American Fisheries Society, 136(5): 1393-1405. 9 2007.\n \n\n\n\n
\n\n\n\n \n \n \"LivingWebsite\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{\n title = {Living in a Dynamic Environment: Variability in Life History Traits of Age-0 Splittail in Tributaries of San Francisco Bay},\n type = {article},\n year = {2007},\n pages = {1393-1405},\n volume = {136},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-35848939181&partnerID=tZOtx3y1,http://www.tandfonline.com/doi/abs/10.1577/T06-253.1},\n month = {9},\n id = {b4b089b6-b222-308c-98e7-32fbf0786a6a},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Feyrer2007a},\n private_publication = {false},\n abstract = {Splittail Pogonichthys macrolepidotus is a relatively large cyprinid endemic to the San Francisco Estuary watershed. During late winter and early spring, splittails migrate from the estuary to upstream rivers and floodplains for spawning. During 2002 and 2003, we examined the diet composition, muscle stable isotope signatures (delta C-13 and delta N-15), and growth rates of age-0 splittails in the four primary rivers used for spawning. Overall, we found substantial variability in all three traits in spatial and temporal comparisons. Age-0 splittails consumed a variety of prey taxa, consisting almost exclusively of aquatic invertebrates, larval stages of chironomids or copepods generally being the most common. We found that the delta N-15 and delta C-13 signatures of age-0 splittails significantly varied spatially and temporally (delta N-15 range = 6.1-19.6 parts per thousand; delta C-13 range -36.3 to - 17.5 parts per thousand). Environmental conditions, namely flow and how it manipulates habitat connectivity, appeared to affect delta C-13. Age-0 splittails exhibited substantial variability in growth rate both spatially and temporally. However, this variability was not associated with diet composition or stable isotope signatures, suggesting that food availability and physical habitat conditions were important factors affecting growth rates during our study.},\n bibtype = {article},\n author = {Feyrer, Frederick and Sommer, Ted and Hobbs, James},\n doi = {10.1577/T06-253.1},\n journal = {Transactions of the American Fisheries Society},\n number = {5}\n}
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\n Splittail Pogonichthys macrolepidotus is a relatively large cyprinid endemic to the San Francisco Estuary watershed. During late winter and early spring, splittails migrate from the estuary to upstream rivers and floodplains for spawning. During 2002 and 2003, we examined the diet composition, muscle stable isotope signatures (delta C-13 and delta N-15), and growth rates of age-0 splittails in the four primary rivers used for spawning. Overall, we found substantial variability in all three traits in spatial and temporal comparisons. Age-0 splittails consumed a variety of prey taxa, consisting almost exclusively of aquatic invertebrates, larval stages of chironomids or copepods generally being the most common. We found that the delta N-15 and delta C-13 signatures of age-0 splittails significantly varied spatially and temporally (delta N-15 range = 6.1-19.6 parts per thousand; delta C-13 range -36.3 to - 17.5 parts per thousand). Environmental conditions, namely flow and how it manipulates habitat connectivity, appeared to affect delta C-13. Age-0 splittails exhibited substantial variability in growth rate both spatially and temporally. However, this variability was not associated with diet composition or stable isotope signatures, suggesting that food availability and physical habitat conditions were important factors affecting growth rates during our study.\n
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\n \n\n \n \n \n \n \n \n Modification of the biological intercept model to account for ontogenetic effects in laboratory-reared delta smelt (Hypomesus transpacificus).\n \n \n \n \n\n\n \n Hobbs, J., A.; Bennett, W., A.; Burton, J., E.; and Baskerville-Bridges, B.\n\n\n \n\n\n\n Fishery Bulletin, 105(1): 30-38. 2007.\n \n\n\n\n
\n\n\n\n \n \n \"ModificationWebsite\n  \n \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
@article{\n title = {Modification of the biological intercept model to account for ontogenetic effects in laboratory-reared delta smelt (Hypomesus transpacificus)},\n type = {article},\n year = {2007},\n pages = {30-38},\n volume = {105},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-34047143704&partnerID=tZOtx3y1},\n id = {a5287061-4fce-3f6e-af9f-c803f431b7c1},\n created = {2016-10-22T02:52:24.000Z},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2007a},\n private_publication = {false},\n abstract = {We investigated age, growth, and ontogenetic effects on the proportionality of otolith size to fish size in laboratory-reared delta smelt (Hypomesus transpacificus) from the San Francisco Bay estuary. Delta smelt larvae were reared from hatching in laboratory mesocosms for 100 days. Otolith increments from known-age fish were enumerated to validate that growth increments were deposited daily and to validate the age of fish at first ring formation. Delta smelt were found to lay down daily ring increments; however, the first increment did not form until six days after hatching. The relationship between otolith size and fish size was not biased by age or growth-rate effects but did exhibit an interruption in linear growth owing to an ontogenetic shift at the postflexon stage. To back-calculate the size-at-age of individual fish, we modified the biological intercept (BI) model to account for ontogenetic changes in the otolith-size-fish-size relationship and compared the results to the time-varying growth model, as well as the modified Fry model. We found the modified BI model estimated more accurately the size-at-age from hatching to 100 days after hatching. Before back-calculating size-at-age with existing models, we recommend a critical evaluation of the effects that age, growth, and ontogeny can have on the otolith-size-fish-size relationship.},\n bibtype = {article},\n author = {Hobbs, James A. and Bennett, William A. and Burton, Jessica E. and Baskerville-Bridges, Bradd},\n journal = {Fishery Bulletin},\n number = {1}\n}
\n
\n\n\n
\n We investigated age, growth, and ontogenetic effects on the proportionality of otolith size to fish size in laboratory-reared delta smelt (Hypomesus transpacificus) from the San Francisco Bay estuary. Delta smelt larvae were reared from hatching in laboratory mesocosms for 100 days. Otolith increments from known-age fish were enumerated to validate that growth increments were deposited daily and to validate the age of fish at first ring formation. Delta smelt were found to lay down daily ring increments; however, the first increment did not form until six days after hatching. The relationship between otolith size and fish size was not biased by age or growth-rate effects but did exhibit an interruption in linear growth owing to an ontogenetic shift at the postflexon stage. To back-calculate the size-at-age of individual fish, we modified the biological intercept (BI) model to account for ontogenetic changes in the otolith-size-fish-size relationship and compared the results to the time-varying growth model, as well as the modified Fry model. We found the modified BI model estimated more accurately the size-at-age from hatching to 100 days after hatching. Before back-calculating size-at-age with existing models, we recommend a critical evaluation of the effects that age, growth, and ontogeny can have on the otolith-size-fish-size relationship.\n
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\n  \n 2006\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Assessing nursery habitat quality for native smelts (Osmeridae) in the low-salinity zone of the San Francisco estuary.\n \n \n \n \n\n\n \n Hobbs, J., A.; Bennett, W., A.; and Burton, J., E.\n\n\n \n\n\n\n Journal of Fish Biology, 69(3): 907-922. 9 2006.\n \n\n\n\n
\n\n\n\n \n \n \"AssessingWebsite\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 2 downloads\n \n \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{\n title = {Assessing nursery habitat quality for native smelts (Osmeridae) in the low-salinity zone of the San Francisco estuary},\n type = {article},\n year = {2006},\n keywords = {Delta smelt,Longfin smelt,Nursery habitat,San Francisco estuary},\n pages = {907-922},\n volume = {69},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33747381362&partnerID=tZOtx3y1},\n month = {9},\n id = {7c20d933-31a1-3621-b63a-c484475a6bf1},\n created = {2016-10-22T02:52:23.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2006},\n private_publication = {false},\n abstract = {Habitat quality was assessed for two native osmerids, delta smelt Hypomesus transpacificus and longfin smelt Spirinchus thaleichthys, between two distinct nursery areas located in the low-salinity zone of the San Francisco estuary. The relationship between several variables was investigated including fish density, fish size, feeding success and the general condition of larvae as well as juveniles for both species. The nursery habitats that were evaluated included the North and South Channels of Suisun Bay. The results showed higher densities of zooplankton and decreased water velocities for the North Channel when compared to the South Channel. The dominant prey item was calanoid copepod Pseudodiaptomus forbesi for both species although longfin smelt residing in the North Channel also included another copepod in their diets, Acanthocyclops spp. In both locations, delta smelt fed predominantly during daytime flood tides, while longfin smelt feeding appeared to continue into the night hours. When both locations were compared, delta smelt in the North Channel exhibited higher densities, larger sizes, increased somatic condition and larvae <15 mm standard length demonstrated greater feeding success. Longfin smelt, exhibited similar densities, feeding success and size distributions between both channels, but generally showed poorer somatic condition for the South Channel, potentially due to energetic costs associated with documented vertical migration behaviour. Overall, the physical conditions of the North Channel provided superior habitat for both species, while the South Channel afforded only marginal habitat for longfin smelt and very poor habitat for delta smelt. Therefore, the North Channel of Suisun Bay acts as critical nursery habitat by providing better feeding and growing conditions leading to increased health and survival for both species. © 2006 The Authors.},\n bibtype = {article},\n author = {Hobbs, J. A. and Bennett, W. A. and Burton, J. E.},\n doi = {10.1111/j.1095-8649.2006.01176.x},\n journal = {Journal of Fish Biology},\n number = {3}\n}
\n
\n\n\n
\n Habitat quality was assessed for two native osmerids, delta smelt Hypomesus transpacificus and longfin smelt Spirinchus thaleichthys, between two distinct nursery areas located in the low-salinity zone of the San Francisco estuary. The relationship between several variables was investigated including fish density, fish size, feeding success and the general condition of larvae as well as juveniles for both species. The nursery habitats that were evaluated included the North and South Channels of Suisun Bay. The results showed higher densities of zooplankton and decreased water velocities for the North Channel when compared to the South Channel. The dominant prey item was calanoid copepod Pseudodiaptomus forbesi for both species although longfin smelt residing in the North Channel also included another copepod in their diets, Acanthocyclops spp. In both locations, delta smelt fed predominantly during daytime flood tides, while longfin smelt feeding appeared to continue into the night hours. When both locations were compared, delta smelt in the North Channel exhibited higher densities, larger sizes, increased somatic condition and larvae <15 mm standard length demonstrated greater feeding success. Longfin smelt, exhibited similar densities, feeding success and size distributions between both channels, but generally showed poorer somatic condition for the South Channel, potentially due to energetic costs associated with documented vertical migration behaviour. Overall, the physical conditions of the North Channel provided superior habitat for both species, while the South Channel afforded only marginal habitat for longfin smelt and very poor habitat for delta smelt. Therefore, the North Channel of Suisun Bay acts as critical nursery habitat by providing better feeding and growing conditions leading to increased health and survival for both species. © 2006 The Authors.\n
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\n \n\n \n \n \n \n \n \n Assessing nursery habitat quality for native smelts (Osmeridae) in the low-salinity zone of the San Francisco estuary.\n \n \n \n \n\n\n \n Hobbs, J., A.; Bennett, W., A.; and Burton, J., E.\n\n\n \n\n\n\n Journal of Fish Biology, 69(3): 907-922. 9 2006.\n \n\n\n\n
\n\n\n\n \n \n \"AssessingWebsite\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 2 downloads\n \n \n\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{\n title = {Assessing nursery habitat quality for native smelts (Osmeridae) in the low-salinity zone of the San Francisco estuary},\n type = {article},\n year = {2006},\n keywords = {Delta smelt,Longfin smelt,Nursery habitat,San Francisco estuary},\n pages = {907-922},\n volume = {69},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33747381362&partnerID=tZOtx3y1},\n month = {9},\n id = {bbe1fe47-3ee1-3087-b8a2-a9de00cef859},\n created = {2017-01-24T23:48:12.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2006},\n private_publication = {false},\n abstract = {Habitat quality was assessed for two native osmerids, delta smelt Hypomesus transpacificus and longfin smelt Spirinchus thaleichthys, between two distinct nursery areas located in the low-salinity zone of the San Francisco estuary. The relationship between several variables was investigated including fish density, fish size, feeding success and the general condition of larvae as well as juveniles for both species. The nursery habitats that were evaluated included the North and South Channels of Suisun Bay. The results showed higher densities of zooplankton and decreased water velocities for the North Channel when compared to the South Channel. The dominant prey item was calanoid copepod Pseudodiaptomus forbesi for both species although longfin smelt residing in the North Channel also included another copepod in their diets, Acanthocyclops spp. In both locations, delta smelt fed predominantly during daytime flood tides, while longfin smelt feeding appeared to continue into the night hours. When both locations were compared, delta smelt in the North Channel exhibited higher densities, larger sizes, increased somatic condition and larvae <15 mm standard length demonstrated greater feeding success. Longfin smelt, exhibited similar densities, feeding success and size distributions between both channels, but generally showed poorer somatic condition for the South Channel, potentially due to energetic costs associated with documented vertical migration behaviour. Overall, the physical conditions of the North Channel provided superior habitat for both species, while the South Channel afforded only marginal habitat for longfin smelt and very poor habitat for delta smelt. Therefore, the North Channel of Suisun Bay acts as critical nursery habitat by providing better feeding and growing conditions leading to increased health and survival for both species. © 2006 The Authors.},\n bibtype = {article},\n author = {Hobbs, J. A. and Bennett, W. A. and Burton, J. E.},\n doi = {10.1111/j.1095-8649.2006.01176.x},\n journal = {Journal of Fish Biology},\n number = {3}\n}
\n
\n\n\n
\n Habitat quality was assessed for two native osmerids, delta smelt Hypomesus transpacificus and longfin smelt Spirinchus thaleichthys, between two distinct nursery areas located in the low-salinity zone of the San Francisco estuary. The relationship between several variables was investigated including fish density, fish size, feeding success and the general condition of larvae as well as juveniles for both species. The nursery habitats that were evaluated included the North and South Channels of Suisun Bay. The results showed higher densities of zooplankton and decreased water velocities for the North Channel when compared to the South Channel. The dominant prey item was calanoid copepod Pseudodiaptomus forbesi for both species although longfin smelt residing in the North Channel also included another copepod in their diets, Acanthocyclops spp. In both locations, delta smelt fed predominantly during daytime flood tides, while longfin smelt feeding appeared to continue into the night hours. When both locations were compared, delta smelt in the North Channel exhibited higher densities, larger sizes, increased somatic condition and larvae <15 mm standard length demonstrated greater feeding success. Longfin smelt, exhibited similar densities, feeding success and size distributions between both channels, but generally showed poorer somatic condition for the South Channel, potentially due to energetic costs associated with documented vertical migration behaviour. Overall, the physical conditions of the North Channel provided superior habitat for both species, while the South Channel afforded only marginal habitat for longfin smelt and very poor habitat for delta smelt. Therefore, the North Channel of Suisun Bay acts as critical nursery habitat by providing better feeding and growing conditions leading to increased health and survival for both species. © 2006 The Authors.\n
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\n  \n 2005\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Retrospective determination of natal habitats for an estuarine fish with otolith strontium isotope ratios.\n \n \n \n \n\n\n \n Hobbs, J., A.; Yin, Q.; Burton, J.; and Bennett, W., A.\n\n\n \n\n\n\n Marine and Freshwater Research, 56(5): 655. 2005.\n \n\n\n\n
\n\n\n\n \n \n \"RetrospectiveWebsite\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
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@article{\n title = {Retrospective determination of natal habitats for an estuarine fish with otolith strontium isotope ratios},\n type = {article},\n year = {2005},\n keywords = {Delta smelt,Natal origins,Otoliths,Strontium isotopes},\n pages = {655},\n volume = {56},\n websites = {http://www.publish.csiro.au/?paper=MF04136,http://www.scopus.com/inward/record.url?eid=2-s2.0-25144483857&partnerID=tZOtx3y1},\n id = {9fa466b4-28da-32a7-bcfe-7e3ff632032e},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {true},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Hobbs2005},\n private_publication = {false},\n abstract = {We investigated the ability of strontium isotope ratios (87Sr/86Sr) in otolith cores to record the natal habitats of juvenile delta smelt Hypomesus transpacificus from the San Francisco Estuary, USA.Young delta smelt (<60 days old)were collected during the California Department ofFish andGame20-mmSurvey inMay and June of 1999 at several potential natal areas: Napa River, Suisun Marsh,West Delta, North Delta, Central Delta, South Delta and East Delta.The core region of sagittal otolithswas assayed with laser ablation-multicollector inductively coupled plasma mass spectroscopy. The laser ablation technique provided precise estimates of 87Sr : 86Sr ratios with relative standard deviation of 0.003% (one sigma). Isotope ratios ranged from 0.7065 to 0.708 and were different among natal habitats. However, natal habitats within the delta regionwere not discernable among each other, and reflect the mixing of the two major rivers, Sacramento River and San Joaquin River within the delta.We will therefore be able to determine natal habitats for delta smelt by assaying the core region of the otoliths. The application of strontium isotope ratios (87Sr/86Sr) in fish otoliths will greatly improve conservation efforts for this protected species.},\n bibtype = {article},\n author = {Hobbs, James A. and Yin, Qing-zhu and Burton, Jessica and Bennett, William A.},\n doi = {10.1071/MF04136},\n journal = {Marine and Freshwater Research},\n number = {5}\n}
\n
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\n We investigated the ability of strontium isotope ratios (87Sr/86Sr) in otolith cores to record the natal habitats of juvenile delta smelt Hypomesus transpacificus from the San Francisco Estuary, USA.Young delta smelt (<60 days old)were collected during the California Department ofFish andGame20-mmSurvey inMay and June of 1999 at several potential natal areas: Napa River, Suisun Marsh,West Delta, North Delta, Central Delta, South Delta and East Delta.The core region of sagittal otolithswas assayed with laser ablation-multicollector inductively coupled plasma mass spectroscopy. The laser ablation technique provided precise estimates of 87Sr : 86Sr ratios with relative standard deviation of 0.003% (one sigma). Isotope ratios ranged from 0.7065 to 0.708 and were different among natal habitats. However, natal habitats within the delta regionwere not discernable among each other, and reflect the mixing of the two major rivers, Sacramento River and San Joaquin River within the delta.We will therefore be able to determine natal habitats for delta smelt by assaying the core region of the otoliths. The application of strontium isotope ratios (87Sr/86Sr) in fish otoliths will greatly improve conservation efforts for this protected species.\n
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\n \n\n \n \n \n \n \n \n VALIDATION OF OTOLITH GROWTH RATE ANALYSIS USING CADMIUM-EXPOSED LARVAL TOPSMELT (ATHERINOPS AFFINIS).\n \n \n \n \n\n\n \n Rose, W., L.; Hobbs, J., A.; Nisbet, R., M.; Green, P., G.; Cherr, G., N.; and Anderson, S., L.\n\n\n \n\n\n\n Environmental Toxicology and Chemistry, 24(10): 2612. 2005.\n \n\n\n\n
\n\n\n\n \n \n \"VALIDATIONWebsite\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{\n title = {VALIDATION OF OTOLITH GROWTH RATE ANALYSIS USING CADMIUM-EXPOSED LARVAL TOPSMELT (ATHERINOPS AFFINIS)},\n type = {article},\n year = {2005},\n keywords = {Cadmium,Growth rate,Otolith,Topsmelt,Toxicity testing},\n pages = {2612},\n volume = {24},\n websites = {http://www.scopus.com/inward/record.url?eid=2-s2.0-26844526551&partnerID=tZOtx3y1,http://doi.wiley.com/10.1897/04-516R.1},\n id = {99ede9c0-9839-323a-a0e1-d294242d4c05},\n created = {2016-10-22T02:52:24.000Z},\n accessed = {2016-03-28},\n file_attached = {false},\n profile_id = {b32caa3a-a6aa-3875-9eaa-ba9f1eb70905},\n group_id = {b9735e2c-7f12-3706-bf22-c25e18968190},\n last_modified = {2017-03-14T10:25:36.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Rose2005},\n private_publication = {false},\n abstract = {We applied otolith growth rate analysis to an investigation of cadmium (Cd)-exposed larval topsmelt (Atherinops affinis) to determine if growth rate was a more sensitive measure than somatic growth (body wt or length). Topsmelt otoliths, calcareous concretions in the fish inner ear, formed daily increments, and otolith growth was proportional to somatic growth. Nine-day posthatch larval topsmelt were exposed to Cd (0-100 ppb) in seawater for 14 d and fed low or high ration levels in separate experiments. Whereas Cd impaired topsmelt growth and growth rates, the extent of growth reduction was dependent on the ration level. At high ration levels, otolith and somatic growth rates of fish exposed to Cd (50 and 100 ppb) were significantly reduced; however, no differences in final mean weight and only marginal differences in final mean length of Cd-exposed topsmelt were observed. At low ration levels, we detected reductions in both somatic growth as well as otolith and somatic growth rates of topsmelt exposed to Cd (50 and 100 ppb). Otolith growth rate analysis was more sensitive than growth measurements of Cd-exposed topsmelt, because it allowed the detection of small differences in growth rates even when differences in somatic growth were not observed. © 2005 SETAC.},\n bibtype = {article},\n author = {Rose, Wendy L. and Hobbs, James A. and Nisbet, Roger M. and Green, Peter G. and Cherr, Gary N. and Anderson, Susan L.},\n doi = {10.1897/04-516R.1},\n journal = {Environmental Toxicology and Chemistry},\n number = {10}\n}
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\n We applied otolith growth rate analysis to an investigation of cadmium (Cd)-exposed larval topsmelt (Atherinops affinis) to determine if growth rate was a more sensitive measure than somatic growth (body wt or length). Topsmelt otoliths, calcareous concretions in the fish inner ear, formed daily increments, and otolith growth was proportional to somatic growth. Nine-day posthatch larval topsmelt were exposed to Cd (0-100 ppb) in seawater for 14 d and fed low or high ration levels in separate experiments. Whereas Cd impaired topsmelt growth and growth rates, the extent of growth reduction was dependent on the ration level. At high ration levels, otolith and somatic growth rates of fish exposed to Cd (50 and 100 ppb) were significantly reduced; however, no differences in final mean weight and only marginal differences in final mean length of Cd-exposed topsmelt were observed. At low ration levels, we detected reductions in both somatic growth as well as otolith and somatic growth rates of topsmelt exposed to Cd (50 and 100 ppb). Otolith growth rate analysis was more sensitive than growth measurements of Cd-exposed topsmelt, because it allowed the detection of small differences in growth rates even when differences in somatic growth were not observed. © 2005 SETAC.\n
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