Seasonal nitrogen uptake and regeneration in the western coastal Arctic
Abstract Here, we present the first study to investigate the seasonal importance of amino acid‐nitrogen (N) to Arctic near shore microbial communities. We measured primary productivity and the uptake of ammonium, nitrate, urea, and amino acids in two size fractions (> 3 μ m and approximately 0.7–...
Published in: | Limnology and Oceanography |
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crwiley:10.1002/lno.10580 2024-09-15T18:02:00+00:00 Seasonal nitrogen uptake and regeneration in the western coastal Arctic Baer, Steven E. Sipler, Rachel E. Roberts, Quinn N. Yager, Patricia L. Frischer, Marc E. Bronk, Deborah A. NSF 2017 http://dx.doi.org/10.1002/lno.10580 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10580 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10580 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.10580 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.10580 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10580 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 62, issue 6, page 2463-2479 ISSN 0024-3590 1939-5590 journal-article 2017 crwiley https://doi.org/10.1002/lno.10580 2024-08-06T04:14:22Z Abstract Here, we present the first study to investigate the seasonal importance of amino acid‐nitrogen (N) to Arctic near shore microbial communities. We measured primary productivity and the uptake of ammonium, nitrate, urea, and amino acids in two size fractions (> 3 μ m and approximately 0.7–3 μ m), as well as ammonium regeneration and nitrification using 15 N and 13 C tracer approaches in the near‐shore waters of the Chukchi Sea, during January, April, and August for two consecutive years. At discrete depths, nitrate comprised 46–78% of the total dissolved N pool during January and April but only 2–6% during August. Dissolved organic N (DON) concentrations increased between January and August though the carbon (C) : N (mol : mol) of the DON pool declined. Of the substrates tested, amino acids supported the bulk of both N and C nutrition in both size fractions during January and April (ice‐covered). Urea generally had the lowest uptake rate under ice‐covered conditions; uptake of urea‐C was only detectable in August. Though previous Arctic studies focused largely on nitrate, we found nitrate uptake was generally lower than other substrates tested. The sharp decline in nitrate concentration between April and August, however, indicates a drawdown of nitrate during that period. Rates of ammonium uptake were highest in August, when it was the dominant N substrate used. During all sample periods, rates of ammonium regeneration were sufficient to supply ammonium demand. Rates of nitrification varied between sample periods, however, with much higher rates seen in January and April. Article in Journal/Newspaper Chukchi Chukchi Sea Wiley Online Library Limnology and Oceanography 62 6 2463 2479 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Here, we present the first study to investigate the seasonal importance of amino acid‐nitrogen (N) to Arctic near shore microbial communities. We measured primary productivity and the uptake of ammonium, nitrate, urea, and amino acids in two size fractions (> 3 μ m and approximately 0.7–3 μ m), as well as ammonium regeneration and nitrification using 15 N and 13 C tracer approaches in the near‐shore waters of the Chukchi Sea, during January, April, and August for two consecutive years. At discrete depths, nitrate comprised 46–78% of the total dissolved N pool during January and April but only 2–6% during August. Dissolved organic N (DON) concentrations increased between January and August though the carbon (C) : N (mol : mol) of the DON pool declined. Of the substrates tested, amino acids supported the bulk of both N and C nutrition in both size fractions during January and April (ice‐covered). Urea generally had the lowest uptake rate under ice‐covered conditions; uptake of urea‐C was only detectable in August. Though previous Arctic studies focused largely on nitrate, we found nitrate uptake was generally lower than other substrates tested. The sharp decline in nitrate concentration between April and August, however, indicates a drawdown of nitrate during that period. Rates of ammonium uptake were highest in August, when it was the dominant N substrate used. During all sample periods, rates of ammonium regeneration were sufficient to supply ammonium demand. Rates of nitrification varied between sample periods, however, with much higher rates seen in January and April. |
author2 |
NSF |
format |
Article in Journal/Newspaper |
author |
Baer, Steven E. Sipler, Rachel E. Roberts, Quinn N. Yager, Patricia L. Frischer, Marc E. Bronk, Deborah A. |
spellingShingle |
Baer, Steven E. Sipler, Rachel E. Roberts, Quinn N. Yager, Patricia L. Frischer, Marc E. Bronk, Deborah A. Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
author_facet |
Baer, Steven E. Sipler, Rachel E. Roberts, Quinn N. Yager, Patricia L. Frischer, Marc E. Bronk, Deborah A. |
author_sort |
Baer, Steven E. |
title |
Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
title_short |
Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
title_full |
Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
title_fullStr |
Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
title_full_unstemmed |
Seasonal nitrogen uptake and regeneration in the western coastal Arctic |
title_sort |
seasonal nitrogen uptake and regeneration in the western coastal arctic |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/lno.10580 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10580 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10580 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.10580 https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lno.10580 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10580 |
genre |
Chukchi Chukchi Sea |
genre_facet |
Chukchi Chukchi Sea |
op_source |
Limnology and Oceanography volume 62, issue 6, page 2463-2479 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.10580 |
container_title |
Limnology and Oceanography |
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62 |
container_issue |
6 |
container_start_page |
2463 |
op_container_end_page |
2479 |
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1810439066850689024 |