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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Published in:Limnology and Oceanography
Main Authors: Wheeler, Patricia A., Kokkinakis, Steven A.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1990
Subjects:
Online Access:http://dx.doi.org/10.4319/lo.1990.35.6.1267
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spelling 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
institution Open Polar
collection Wiley Online Library
op_collection_id 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
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