N-limited consumer growth and low nutrient regeneration N:P ratios in lakes with low N deposition. Bergström, A., Karlsson, D., Karlsson, J., & Vrede, T. Ecosphere, 6(1):1–13, January, 2015. Paper doi abstract bibtex Nutrient limitation of primary producers and their consumers can have a large influence on ecosystem productivity. The nature and strength of nutrient limitation is driven both by external factors (e.g., nutrient loading) and internal processes (e.g., consumer-driven nutrient regeneration). Here we present results from a field study in 10 low productive headwater lakes in northern subarctic Sweden, where nitrogen (N) deposition is low and phytoplankton is primarily N-limited. We assessed the carbon:nitrogen:phosphorus (C:N:P) stoichiometry of seston and zooplankton and estimated the N:P ratio of consumer-driven nutrient regeneration. Based on stoichiometric models, the estimated elemental imbalances between seston and zooplankton suggest that zooplankton were mainly N-limited and regenerated nutrients with low N:P ratios (median 11.9, atomic ratio). The predicted N:P regeneration ratios were consistent with results from phytoplankton nutrient limitation bioassays in mid-summer, i.e., the N:P regeneration was predicted to be low when phytoplankton were N-limited, and high when phytoplankton were P-limited. During other seasons, when water discharge was high, nutrient loading from the surrounding catchments apparently had the strongest effect on phytoplankton nutrient limitation. We propose that lakes with higher N:P ratios than the open ocean is an effect of N deposition, that N-limitation of consumers and phytoplankton is further enhanced by low nutrient regeneration N:P ratios, and that in the absence of N deposition, lake and ocean N:P stoichiometry are similar.
@article{bergstrom_n-limited_2015,
title = {N-limited consumer growth and low nutrient regeneration {N}:{P} ratios in lakes with low {N} deposition},
volume = {6},
issn = {2150-8925},
shorttitle = {N-limited consumer growth and low nutrient regeneration {N}},
url = {http://onlinelibrary.wiley.com/doi/10.1890/ES14-00333.1/abstract},
doi = {10.1890/ES14-00333.1},
abstract = {Nutrient limitation of primary producers and their consumers can have a large influence on ecosystem productivity. The nature and strength of nutrient limitation is driven both by external factors (e.g., nutrient loading) and internal processes (e.g., consumer-driven nutrient regeneration). Here we present results from a field study in 10 low productive headwater lakes in northern subarctic Sweden, where nitrogen (N) deposition is low and phytoplankton is primarily N-limited. We assessed the carbon:nitrogen:phosphorus (C:N:P) stoichiometry of seston and zooplankton and estimated the N:P ratio of consumer-driven nutrient regeneration. Based on stoichiometric models, the estimated elemental imbalances between seston and zooplankton suggest that zooplankton were mainly N-limited and regenerated nutrients with low N:P ratios (median 11.9, atomic ratio). The predicted N:P regeneration ratios were consistent with results from phytoplankton nutrient limitation bioassays in mid-summer, i.e., the N:P regeneration was predicted to be low when phytoplankton were N-limited, and high when phytoplankton were P-limited. During other seasons, when water discharge was high, nutrient loading from the surrounding catchments apparently had the strongest effect on phytoplankton nutrient limitation. We propose that lakes with higher N:P ratios than the open ocean is an effect of N deposition, that N-limitation of consumers and phytoplankton is further enhanced by low nutrient regeneration N:P ratios, and that in the absence of N deposition, lake and ocean N:P stoichiometry are similar.},
language = {en},
number = {1},
urldate = {2017-02-06},
journal = {Ecosphere},
author = {Bergström, Ann-Kristin and Karlsson, Daniel and Karlsson, Jan and Vrede, Tobias},
month = jan,
year = {2015},
keywords = {\#nosource, Nitrogen, consumer driven nutrient cycling, ecological stoichiometry, nutrient limitation, phosphorus, phytoplankton, zooplankton},
pages = {1--13},
}
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Here we present results from a field study in 10 low productive headwater lakes in northern subarctic Sweden, where nitrogen (N) deposition is low and phytoplankton is primarily N-limited. We assessed the carbon:nitrogen:phosphorus (C:N:P) stoichiometry of seston and zooplankton and estimated the N:P ratio of consumer-driven nutrient regeneration. Based on stoichiometric models, the estimated elemental imbalances between seston and zooplankton suggest that zooplankton were mainly N-limited and regenerated nutrients with low N:P ratios (median 11.9, atomic ratio). The predicted N:P regeneration ratios were consistent with results from phytoplankton nutrient limitation bioassays in mid-summer, i.e., the N:P regeneration was predicted to be low when phytoplankton were N-limited, and high when phytoplankton were P-limited. During other seasons, when water discharge was high, nutrient loading from the surrounding catchments apparently had the strongest effect on phytoplankton nutrient limitation. We propose that lakes with higher N:P ratios than the open ocean is an effect of N deposition, that N-limitation of consumers and phytoplankton is further enhanced by low nutrient regeneration N:P ratios, and that in the absence of N deposition, lake and ocean N:P stoichiometry are similar.","language":"en","number":"1","urldate":"2017-02-06","journal":"Ecosphere","author":[{"propositions":[],"lastnames":["Bergström"],"firstnames":["Ann-Kristin"],"suffixes":[]},{"propositions":[],"lastnames":["Karlsson"],"firstnames":["Daniel"],"suffixes":[]},{"propositions":[],"lastnames":["Karlsson"],"firstnames":["Jan"],"suffixes":[]},{"propositions":[],"lastnames":["Vrede"],"firstnames":["Tobias"],"suffixes":[]}],"month":"January","year":"2015","keywords":"#nosource, Nitrogen, consumer driven nutrient cycling, ecological stoichiometry, nutrient limitation, phosphorus, phytoplankton, zooplankton","pages":"1–13","bibtex":"@article{bergstrom_n-limited_2015,\n\ttitle = {N-limited consumer growth and low nutrient regeneration {N}:{P} ratios in lakes with low {N} deposition},\n\tvolume = {6},\n\tissn = {2150-8925},\n\tshorttitle = {N-limited consumer growth and low nutrient regeneration {N}},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1890/ES14-00333.1/abstract},\n\tdoi = {10.1890/ES14-00333.1},\n\tabstract = {Nutrient limitation of primary producers and their consumers can have a large influence on ecosystem productivity. 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