Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet
Global change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing h...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2022
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187049 https://doi.org/10.1007/s10021-021-00693-x |
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ftumeauniv:oai:DiVA.org:umu-187049 2023-10-09T21:48:51+02:00 Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet Prater, Clay Bullard, Joanna E. Osburn, Christopher L. Martin, Sarah L. Watts, Michael J. Anderson, N. John 2022 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187049 https://doi.org/10.1007/s10021-021-00693-x eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap Geography and Environment, Loughborough University, Loughborough, United Kingdom Department of Marine, Earth and Atmospheric Science, North Carolina State University, NC, Raleigh, United States Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Keyworth, United Kingdom Ecosystems (New York. Print), 1432-9840, 2022, 25, s. 931-947 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187049 doi:10.1007/s10021-021-00693-x ISI:000686446900003 Scopus 2-s2.0-85112772649 info:eu-repo/semantics/openAccess Arctic Atmospheric deposition Biogenic silica Biogeochemistry Diatom Ecological stoichiometry Limnology Nutrient limitation Ecology Ekologi Environmental Sciences Miljövetenskap Article in journal info:eu-repo/semantics/article text 2022 ftumeauniv https://doi.org/10.1007/s10021-021-00693-x 2023-09-22T13:55:58Z Global change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing hot spots such as lakes. To understand how these ecosystems will respond in the future, this study examined recent (< 10 y) and long-term (1000 y) shifts in autotrophic production across paraglacial environmental gradients in SW Greenland. Contemporary lake temperatures and light levels increased with distance from the ice sheet, along with dissolved organic C (DOC) concentrations and total nitrogen:total phosphorus (TN:TP) ratios. Diatom production measured as biogenic silica accumulation rates (BSiARs) and diatom contribution to microbial communities declined across these gradients, while total production estimated using C accumulation rates and δ13C increased, indicating that autochthonous production and C burial are controlled by microbial competition and competitive displacement across physiochemical gradients in the region. Diatom production was generally low across lakes prior to the 1800's AD but has risen 1.5–3× above background levels starting between 1750 and 1880 AD. These increases predate contemporary regional warming by 115–250 years, and temperature stimulation of primary production was inconsistent with paleorecords for ~ 90% of the last millennium. Instead, primary production appeared to be more strongly related to N and P availability, which differs considerably across the region due to lake landscape position, glacial activity and degree of atmospheric nutrient deposition. These results suggest that biological responses to enhanced nutrient supply could serve as important negative feedbacks to global change. Article in Journal/Newspaper Arctic Greenland Ice Sheet Umeå University: Publications (DiVA) Arctic Greenland Ecosystems |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Arctic Atmospheric deposition Biogenic silica Biogeochemistry Diatom Ecological stoichiometry Limnology Nutrient limitation Ecology Ekologi Environmental Sciences Miljövetenskap |
spellingShingle |
Arctic Atmospheric deposition Biogenic silica Biogeochemistry Diatom Ecological stoichiometry Limnology Nutrient limitation Ecology Ekologi Environmental Sciences Miljövetenskap Prater, Clay Bullard, Joanna E. Osburn, Christopher L. Martin, Sarah L. Watts, Michael J. Anderson, N. John Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
topic_facet |
Arctic Atmospheric deposition Biogenic silica Biogeochemistry Diatom Ecological stoichiometry Limnology Nutrient limitation Ecology Ekologi Environmental Sciences Miljövetenskap |
description |
Global change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing hot spots such as lakes. To understand how these ecosystems will respond in the future, this study examined recent (< 10 y) and long-term (1000 y) shifts in autotrophic production across paraglacial environmental gradients in SW Greenland. Contemporary lake temperatures and light levels increased with distance from the ice sheet, along with dissolved organic C (DOC) concentrations and total nitrogen:total phosphorus (TN:TP) ratios. Diatom production measured as biogenic silica accumulation rates (BSiARs) and diatom contribution to microbial communities declined across these gradients, while total production estimated using C accumulation rates and δ13C increased, indicating that autochthonous production and C burial are controlled by microbial competition and competitive displacement across physiochemical gradients in the region. Diatom production was generally low across lakes prior to the 1800's AD but has risen 1.5–3× above background levels starting between 1750 and 1880 AD. These increases predate contemporary regional warming by 115–250 years, and temperature stimulation of primary production was inconsistent with paleorecords for ~ 90% of the last millennium. Instead, primary production appeared to be more strongly related to N and P availability, which differs considerably across the region due to lake landscape position, glacial activity and degree of atmospheric nutrient deposition. These results suggest that biological responses to enhanced nutrient supply could serve as important negative feedbacks to global change. |
format |
Article in Journal/Newspaper |
author |
Prater, Clay Bullard, Joanna E. Osburn, Christopher L. Martin, Sarah L. Watts, Michael J. Anderson, N. John |
author_facet |
Prater, Clay Bullard, Joanna E. Osburn, Christopher L. Martin, Sarah L. Watts, Michael J. Anderson, N. John |
author_sort |
Prater, Clay |
title |
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
title_short |
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
title_full |
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
title_fullStr |
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
title_full_unstemmed |
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet |
title_sort |
landscape controls on nutrient stoichiometry regulate lake primary production at the margin of the greenland ice sheet |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2022 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187049 https://doi.org/10.1007/s10021-021-00693-x |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_relation |
Ecosystems (New York. Print), 1432-9840, 2022, 25, s. 931-947 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187049 doi:10.1007/s10021-021-00693-x ISI:000686446900003 Scopus 2-s2.0-85112772649 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s10021-021-00693-x |
container_title |
Ecosystems |
_version_ |
1779311923710394368 |