Ammonium recycling limits nitrate use in the oceanic subarctic Pacific.
Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH 4 + on NO 3 − assimilation. Surface‐water NO 3 − concentrations ranged from 6 to 17 µ M while NH 4 + concentrations ranged from 0 to 0.4 µ M. Total N assimilation ranged from 84...
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Language: | English |
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crwiley:10.4319/lo.1990.35.6.1267 2024-09-15T18:37:55+00:00 Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. Wheeler, Patricia A. Kokkinakis, Steven A. 1990 http://dx.doi.org/10.4319/lo.1990.35.6.1267 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1990.35.6.1267 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1990.35.6.1267 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 35, issue 6, page 1267-1278 ISSN 0024-3590 1939-5590 journal-article 1990 crwiley https://doi.org/10.4319/lo.1990.35.6.1267 2024-08-30T04:12:31Z Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH 4 + on NO 3 − assimilation. Surface‐water NO 3 − concentrations ranged from 6 to 17 µ M while NH 4 + concentrations ranged from 0 to 0.4 µ M. Total N assimilation ranged from 84 to 732 nM d −1 but showed no seasonal trend. NH 4 + and urea concentrations were <1% of total dissolved inorganic N, but use of this “regenerated” N still accounted for 44–89% of total N assimilation. Rates of NO 3 − assimilation were negatively correlated with ambient NH 4 + concentrations, and concentrations of NH 4 + between 0.1 and 0.3 µ M caused complete inhibition of NO 3 − assimilation. NO 3 − was more important as a source of N in spring than in summer. We attribute this pattern to a summer increase in turnover rates for NH 4 + . Turnover times for the dissolved NH 4 + pool were half as long in August as in May. Grazing and recycling in the euphotic zone apparently both play significant roles in preventing depletion of NO 3 − in the oceanic subarctic Pacific. Article in Journal/Newspaper Subarctic Wiley Online Library Limnology and Oceanography 35 6 1267 1278 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH 4 + on NO 3 − assimilation. Surface‐water NO 3 − concentrations ranged from 6 to 17 µ M while NH 4 + concentrations ranged from 0 to 0.4 µ M. Total N assimilation ranged from 84 to 732 nM d −1 but showed no seasonal trend. NH 4 + and urea concentrations were <1% of total dissolved inorganic N, but use of this “regenerated” N still accounted for 44–89% of total N assimilation. Rates of NO 3 − assimilation were negatively correlated with ambient NH 4 + concentrations, and concentrations of NH 4 + between 0.1 and 0.3 µ M caused complete inhibition of NO 3 − assimilation. NO 3 − was more important as a source of N in spring than in summer. We attribute this pattern to a summer increase in turnover rates for NH 4 + . Turnover times for the dissolved NH 4 + pool were half as long in August as in May. Grazing and recycling in the euphotic zone apparently both play significant roles in preventing depletion of NO 3 − in the oceanic subarctic Pacific. |
format |
Article in Journal/Newspaper |
author |
Wheeler, Patricia A. Kokkinakis, Steven A. |
spellingShingle |
Wheeler, Patricia A. Kokkinakis, Steven A. Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
author_facet |
Wheeler, Patricia A. Kokkinakis, Steven A. |
author_sort |
Wheeler, Patricia A. |
title |
Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
title_short |
Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
title_full |
Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
title_fullStr |
Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
title_full_unstemmed |
Ammonium recycling limits nitrate use in the oceanic subarctic Pacific. |
title_sort |
ammonium recycling limits nitrate use in the oceanic subarctic pacific. |
publisher |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.4319/lo.1990.35.6.1267 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1990.35.6.1267 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1990.35.6.1267 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 35, issue 6, page 1267-1278 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.1990.35.6.1267 |
container_title |
Limnology and Oceanography |
container_volume |
35 |
container_issue |
6 |
container_start_page |
1267 |
op_container_end_page |
1278 |
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1810482270262263808 |