Late‐season nitrogen uptake across the western coastal Alaskan Arctic
Abstract Productivity in the Arctic is expected to increase as temperatures and the number of open water days rise. With this increased productivity, the coastal shelves of the Arctic Ocean may act as a sink for atmospheric carbon. However, this storage is dependent on a sufficient nitrogen (N) supp...
Published in: | Limnology and Oceanography |
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Online Access: | http://dx.doi.org/10.1002/lno.12378 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12378 |
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crwiley:10.1002/lno.12378 2024-06-02T08:01:12+00:00 Late‐season nitrogen uptake across the western coastal Alaskan Arctic Stanley, Brianna C. Sipler, Rachel E. Roberts, Quinn N. Spackeen, Jenna L. Norton, E. Zane Bronk, Deborah A. National Science Foundation Virginia Sea Grant, Virginia Institute of Marine Science 2023 http://dx.doi.org/10.1002/lno.12378 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12378 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ http://creativecommons.org/licenses/by-nc/4.0/ Limnology and Oceanography volume 68, issue 8, page 1687-1703 ISSN 0024-3590 1939-5590 journal-article 2023 crwiley https://doi.org/10.1002/lno.12378 2024-05-03T11:21:00Z Abstract Productivity in the Arctic is expected to increase as temperatures and the number of open water days rise. With this increased productivity, the coastal shelves of the Arctic Ocean may act as a sink for atmospheric carbon. However, this storage is dependent on a sufficient nitrogen (N) supply and current literature on biogeochemical rates of N uptake in this region is severely limited. Here, we report the spatial extent and rate at which the aquatic microbial community utilizes inorganic and organic N substrates in the Alaskan Arctic during late summer. Uptake rates (> 0.3 μ m) were measured in 2016 and 2017 using isotopically labeled ammonium (), nitrate (), urea, and mixed algal amino acids. Rates of regeneration were also measured to investigate the contribution of remineralized N to primary production. Primary production was estimated using isotopically labeled bicarbonate. We found that N species uptake varied by location. Although was the form of N taken up at the greatest rate at most sites, we also found that uptake rates of urea could be greater than and that amino acid uptake was widespread. Supporting previous studies, uptake rates were correlated with primary production rates. Variability in nutrient reservoirs and sampling conditions in the Chukchi Sea between the 2 yr were responsible for some of the variances observed in estimated recycling rates and primary production. Understanding which N sources support this late‐season primary production requires obtaining uptake rates for a diverse range of inorganic and organic N substrates. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Chukchi Sea Wiley Online Library Arctic Arctic Ocean Chukchi Sea Limnology and Oceanography 68 8 1687 1703 |
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crwiley |
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English |
description |
Abstract Productivity in the Arctic is expected to increase as temperatures and the number of open water days rise. With this increased productivity, the coastal shelves of the Arctic Ocean may act as a sink for atmospheric carbon. However, this storage is dependent on a sufficient nitrogen (N) supply and current literature on biogeochemical rates of N uptake in this region is severely limited. Here, we report the spatial extent and rate at which the aquatic microbial community utilizes inorganic and organic N substrates in the Alaskan Arctic during late summer. Uptake rates (> 0.3 μ m) were measured in 2016 and 2017 using isotopically labeled ammonium (), nitrate (), urea, and mixed algal amino acids. Rates of regeneration were also measured to investigate the contribution of remineralized N to primary production. Primary production was estimated using isotopically labeled bicarbonate. We found that N species uptake varied by location. Although was the form of N taken up at the greatest rate at most sites, we also found that uptake rates of urea could be greater than and that amino acid uptake was widespread. Supporting previous studies, uptake rates were correlated with primary production rates. Variability in nutrient reservoirs and sampling conditions in the Chukchi Sea between the 2 yr were responsible for some of the variances observed in estimated recycling rates and primary production. Understanding which N sources support this late‐season primary production requires obtaining uptake rates for a diverse range of inorganic and organic N substrates. |
author2 |
National Science Foundation Virginia Sea Grant, Virginia Institute of Marine Science |
format |
Article in Journal/Newspaper |
author |
Stanley, Brianna C. Sipler, Rachel E. Roberts, Quinn N. Spackeen, Jenna L. Norton, E. Zane Bronk, Deborah A. |
spellingShingle |
Stanley, Brianna C. Sipler, Rachel E. Roberts, Quinn N. Spackeen, Jenna L. Norton, E. Zane Bronk, Deborah A. Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
author_facet |
Stanley, Brianna C. Sipler, Rachel E. Roberts, Quinn N. Spackeen, Jenna L. Norton, E. Zane Bronk, Deborah A. |
author_sort |
Stanley, Brianna C. |
title |
Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
title_short |
Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
title_full |
Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
title_fullStr |
Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
title_full_unstemmed |
Late‐season nitrogen uptake across the western coastal Alaskan Arctic |
title_sort |
late‐season nitrogen uptake across the western coastal alaskan arctic |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/lno.12378 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12378 |
geographic |
Arctic Arctic Ocean Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea |
op_source |
Limnology and Oceanography volume 68, issue 8, page 1687-1703 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12378 |
container_title |
Limnology and Oceanography |
container_volume |
68 |
container_issue |
8 |
container_start_page |
1687 |
op_container_end_page |
1703 |
_version_ |
1800745512108818432 |