A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model
The nitrogen isotopic composition (δ 15 N) of phytoplankton varies substantially in the ocean reflecting biogeochemical processes such as N 2 fixation, denitrification, and nitrate assimilation by phytoplankton. The δ 15 N values of zooplankton or fish inherit the values of the phytoplankton on whic...
Published in: | Frontiers in Marine Science |
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Online Access: | http://dx.doi.org/10.3389/fmars.2024.1294608 https://www.frontiersin.org/articles/10.3389/fmars.2024.1294608/full |
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crfrontiers:10.3389/fmars.2024.1294608 2024-09-15T17:59:44+00:00 A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model Yoshikawa, Chisato Shigemitsu, Masahito Yamamoto, Akitomo Oka, Akira Ohkouchi, Naohiko 2024 http://dx.doi.org/10.3389/fmars.2024.1294608 https://www.frontiersin.org/articles/10.3389/fmars.2024.1294608/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 11 ISSN 2296-7745 journal-article 2024 crfrontiers https://doi.org/10.3389/fmars.2024.1294608 2024-08-27T04:04:08Z The nitrogen isotopic composition (δ 15 N) of phytoplankton varies substantially in the ocean reflecting biogeochemical processes such as N 2 fixation, denitrification, and nitrate assimilation by phytoplankton. The δ 15 N values of zooplankton or fish inherit the values of the phytoplankton on which they feed. Combining δ 15 N values of marine organisms with a map of δ 15 N values (i.e., a nitrogen isoscape) of phytoplankton can reveal the habitat of marine organisms. Remarkable progress has been made in reconstructing time-series of δ 15 N values of migratory fish from various tissues, such as otoliths, fish scales, vertebrae, and eye lenses. However, there are no accurate nitrogen isoscapes of phytoplankton due to observational heterogeneity, preventing improvement in the accuracy of estimating migratory routes using the fish δ 15 N values. Here we present a nitrogen isoscape of phytoplankton in the western North Pacific created with a nitrogen isotope model. The simulated phytoplankton is relatively depleted in 15 N at the subtropical site (annual average δ 15 N value of phytoplankton of 0.6‰), where N 2 fixation occurs, and at the subarctic site (2.1‰), where nitrate assimilation by phytoplankton is low due to iron limitation. The simulated phytoplankton is enriched in 15 N at the Kuroshio–Oyashio transition site (3.9‰), where nitrate utilization is high, and in the region around the Bering Strait site (6.7‰), where partial nitrification and benthic denitrification occur. The simulated δ 15 N distributions of nitrate, phytoplankton, and particulate organic nitrogen are consistent with δ 15 N observations in the western North Pacific. The seamless nitrogen isoscapes created in this study can be used to improve our understanding of the habitat of marine organisms or fish migration in the western North Pacific. Article in Journal/Newspaper Bering Strait Subarctic Frontiers (Publisher) Frontiers in Marine Science 11 |
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description |
The nitrogen isotopic composition (δ 15 N) of phytoplankton varies substantially in the ocean reflecting biogeochemical processes such as N 2 fixation, denitrification, and nitrate assimilation by phytoplankton. The δ 15 N values of zooplankton or fish inherit the values of the phytoplankton on which they feed. Combining δ 15 N values of marine organisms with a map of δ 15 N values (i.e., a nitrogen isoscape) of phytoplankton can reveal the habitat of marine organisms. Remarkable progress has been made in reconstructing time-series of δ 15 N values of migratory fish from various tissues, such as otoliths, fish scales, vertebrae, and eye lenses. However, there are no accurate nitrogen isoscapes of phytoplankton due to observational heterogeneity, preventing improvement in the accuracy of estimating migratory routes using the fish δ 15 N values. Here we present a nitrogen isoscape of phytoplankton in the western North Pacific created with a nitrogen isotope model. The simulated phytoplankton is relatively depleted in 15 N at the subtropical site (annual average δ 15 N value of phytoplankton of 0.6‰), where N 2 fixation occurs, and at the subarctic site (2.1‰), where nitrate assimilation by phytoplankton is low due to iron limitation. The simulated phytoplankton is enriched in 15 N at the Kuroshio–Oyashio transition site (3.9‰), where nitrate utilization is high, and in the region around the Bering Strait site (6.7‰), where partial nitrification and benthic denitrification occur. The simulated δ 15 N distributions of nitrate, phytoplankton, and particulate organic nitrogen are consistent with δ 15 N observations in the western North Pacific. The seamless nitrogen isoscapes created in this study can be used to improve our understanding of the habitat of marine organisms or fish migration in the western North Pacific. |
format |
Article in Journal/Newspaper |
author |
Yoshikawa, Chisato Shigemitsu, Masahito Yamamoto, Akitomo Oka, Akira Ohkouchi, Naohiko |
spellingShingle |
Yoshikawa, Chisato Shigemitsu, Masahito Yamamoto, Akitomo Oka, Akira Ohkouchi, Naohiko A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
author_facet |
Yoshikawa, Chisato Shigemitsu, Masahito Yamamoto, Akitomo Oka, Akira Ohkouchi, Naohiko |
author_sort |
Yoshikawa, Chisato |
title |
A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
title_short |
A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
title_full |
A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
title_fullStr |
A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
title_full_unstemmed |
A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model |
title_sort |
nitrogen isoscape of phytoplankton in the western north pacific created with a marine nitrogen isotope model |
publisher |
Frontiers Media SA |
publishDate |
2024 |
url |
http://dx.doi.org/10.3389/fmars.2024.1294608 https://www.frontiersin.org/articles/10.3389/fmars.2024.1294608/full |
genre |
Bering Strait Subarctic |
genre_facet |
Bering Strait Subarctic |
op_source |
Frontiers in Marine Science volume 11 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2024.1294608 |
container_title |
Frontiers in Marine Science |
container_volume |
11 |
_version_ |
1810436826958135296 |