Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea
International audience Major changes to Arctic marine ecosystems have resulted in longer growing seasons with increased phytoplankton production over larger areas. In the Chukchi Sea, the high productivity fuels intense benthic denitrification creating a nitrogen (N) deficit that is transported thro...
Published in: | Frontiers in Marine Science |
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Online Access: | https://hal.sorbonne-universite.fr/hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015/document https://hal.sorbonne-universite.fr/hal-02046015/file/fmars-05-00362.pdf https://doi.org/10.3389/fmars.2018.00362 |
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ftsorbonneuniv:oai:HAL:hal-02046015v1 2023-06-11T04:09:15+02:00 Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea Mills, Matthew, Brown, Zachary, Laney, Samuel, Ortega-Retuerta, Eva Lowry, Kate, van Dijken, Gert Arrigo, Kevin Department of Earth System Science Stanford (ESS) Stanford EARTH Stanford University-Stanford University Woods Hole Oceanographic Institution (WHOI) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2018 https://hal.sorbonne-universite.fr/hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015/document https://hal.sorbonne-universite.fr/hal-02046015/file/fmars-05-00362.pdf https://doi.org/10.3389/fmars.2018.00362 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2018.00362 hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015/document https://hal.sorbonne-universite.fr/hal-02046015/file/fmars-05-00362.pdf doi:10.3389/fmars.2018.00362 info:eu-repo/semantics/OpenAccess ISSN: 2296-7745 Frontiers in Marine Science https://hal.sorbonne-universite.fr/hal-02046015 Frontiers in Marine Science, 2018, 5, pp.362. ⟨10.3389/fmars.2018.00362⟩ phytoplankton nitrogen Chukchi Sea nitrate nutrient limitation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/article Journal articles 2018 ftsorbonneuniv https://doi.org/10.3389/fmars.2018.00362 2023-05-29T22:06:09Z International audience Major changes to Arctic marine ecosystems have resulted in longer growing seasons with increased phytoplankton production over larger areas. In the Chukchi Sea, the high productivity fuels intense benthic denitrification creating a nitrogen (N) deficit that is transported through the Arctic to the Atlantic Ocean, where it likely fuels N fixation. Given the rapid pace of environmental change and the potentially globally significant N deficit, we conducted experiments aimed at understanding phytoplankton and microbial N utilization in the Chukchi Sea. Ship-board experiments tested the effect of nitrate (NO 3 −) additions on both phytoplankton and heterotrophic prokaryote abundance, community composition, photophysiology, carbon fixation and NO 3 − uptake rates. Results support the critical role of NO 3 − in limiting summer phytoplankton communities to small cells with low production rates. NO 3 − additions increased particulate concentrations, abundance of large diatoms, and rates of carbon fixation and NO 3 − uptake by cells >1 µm. Increases in the quantum yield and electron turnover rate of photosystem II in +NO 3 − treatments suggested that phytoplankton in the ambient dissolved N environment were N starved and unable to build new, or repair damaged, reaction centers. While some increases in heterotrophic prokaryote abundance and production were noted with NO 3 − amendments, phytoplankton competition or grazers likely dampened these responses. Trends toward a warmer more stratified Chukchi Sea will likely enhance summer oligotrophic conditions and further N starve Chukchi Sea phytoplankton communities. Article in Journal/Newspaper Arctic Chukchi Chukchi Sea Phytoplankton HAL Sorbonne Université Arctic Chukchi Sea Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
phytoplankton nitrogen Chukchi Sea nitrate nutrient limitation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
phytoplankton nitrogen Chukchi Sea nitrate nutrient limitation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Mills, Matthew, Brown, Zachary, Laney, Samuel, Ortega-Retuerta, Eva Lowry, Kate, van Dijken, Gert Arrigo, Kevin Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
topic_facet |
phytoplankton nitrogen Chukchi Sea nitrate nutrient limitation [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
International audience Major changes to Arctic marine ecosystems have resulted in longer growing seasons with increased phytoplankton production over larger areas. In the Chukchi Sea, the high productivity fuels intense benthic denitrification creating a nitrogen (N) deficit that is transported through the Arctic to the Atlantic Ocean, where it likely fuels N fixation. Given the rapid pace of environmental change and the potentially globally significant N deficit, we conducted experiments aimed at understanding phytoplankton and microbial N utilization in the Chukchi Sea. Ship-board experiments tested the effect of nitrate (NO 3 −) additions on both phytoplankton and heterotrophic prokaryote abundance, community composition, photophysiology, carbon fixation and NO 3 − uptake rates. Results support the critical role of NO 3 − in limiting summer phytoplankton communities to small cells with low production rates. NO 3 − additions increased particulate concentrations, abundance of large diatoms, and rates of carbon fixation and NO 3 − uptake by cells >1 µm. Increases in the quantum yield and electron turnover rate of photosystem II in +NO 3 − treatments suggested that phytoplankton in the ambient dissolved N environment were N starved and unable to build new, or repair damaged, reaction centers. While some increases in heterotrophic prokaryote abundance and production were noted with NO 3 − amendments, phytoplankton competition or grazers likely dampened these responses. Trends toward a warmer more stratified Chukchi Sea will likely enhance summer oligotrophic conditions and further N starve Chukchi Sea phytoplankton communities. |
author2 |
Department of Earth System Science Stanford (ESS) Stanford EARTH Stanford University-Stanford University Woods Hole Oceanographic Institution (WHOI) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mills, Matthew, Brown, Zachary, Laney, Samuel, Ortega-Retuerta, Eva Lowry, Kate, van Dijken, Gert Arrigo, Kevin |
author_facet |
Mills, Matthew, Brown, Zachary, Laney, Samuel, Ortega-Retuerta, Eva Lowry, Kate, van Dijken, Gert Arrigo, Kevin |
author_sort |
Mills, Matthew, |
title |
Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
title_short |
Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
title_full |
Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
title_fullStr |
Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
title_full_unstemmed |
Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea |
title_sort |
nitrogen limitation of the summer phytoplankton and heterotrophic prokaryote communities in the chukchi sea |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.sorbonne-universite.fr/hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015/document https://hal.sorbonne-universite.fr/hal-02046015/file/fmars-05-00362.pdf https://doi.org/10.3389/fmars.2018.00362 |
geographic |
Arctic Chukchi Sea |
geographic_facet |
Arctic Chukchi Sea |
genre |
Arctic Chukchi Chukchi Sea Phytoplankton |
genre_facet |
Arctic Chukchi Chukchi Sea Phytoplankton |
op_source |
ISSN: 2296-7745 Frontiers in Marine Science https://hal.sorbonne-universite.fr/hal-02046015 Frontiers in Marine Science, 2018, 5, pp.362. ⟨10.3389/fmars.2018.00362⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2018.00362 hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015 https://hal.sorbonne-universite.fr/hal-02046015/document https://hal.sorbonne-universite.fr/hal-02046015/file/fmars-05-00362.pdf doi:10.3389/fmars.2018.00362 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/fmars.2018.00362 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1768383024938876928 |