Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling
Abstract Dinitrogen (N 2 ) fixation is a major source of bioavailable nitrogen to oligotrophic ocean communities. Yet, we have limited understanding how ongoing climate change could alter N 2 fixation. Most of our understanding is based on short‐term laboratory experiments conducted on individual N...
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crwiley:10.1002/lno.11795 2024-09-15T18:24:03+00:00 Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling Singh, Arvind Bach, Lennart T. Löscher, Carolin R. Paul, Allanah J. Ojha, Narendra Riebesell, Ulf Bundesministerium für Bildung und Forschung Exzellenzcluster Ozean der Zukunft H2020 Environment Villum Fonden Horizon 2020 Framework Programme ASCRS Research Foundation Bundesministerium für Bildung und Forschung 2021 http://dx.doi.org/10.1002/lno.11795 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11795 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11795 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11795 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 66, issue 7, page 2855-2867 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11795 2024-08-15T04:19:10Z Abstract Dinitrogen (N 2 ) fixation is a major source of bioavailable nitrogen to oligotrophic ocean communities. Yet, we have limited understanding how ongoing climate change could alter N 2 fixation. Most of our understanding is based on short‐term laboratory experiments conducted on individual N 2 ‐fixing species whereas community‐level approaches are rare. In this longer‐term in situ mesocosm study, we aimed to improve our understanding on the role of rising atmospheric carbon dioxide (CO 2 ) and simulated deep water upwelling on N 2 and carbon (C) fixation rates in a natural oligotrophic plankton community. We deployed nine mesocosms in the subtropical North Atlantic Ocean and enriched seven of these with CO 2 to yield a range of treatments (partial pressure of CO 2 , p CO 2 = 352–1025 μatm). We measured rates of N 2 and C fixation in both light and dark incubations over the 55‐day study period. High p CO 2 negatively impacted light and dark N 2 fixation rates in the oligotrophic phase before simulated upwelling, while the effect reversed in the light N 2 fixation rates in the bloom decay phase after added nutrients were consumed. Dust deposition and simulated upwelling of nutrient‐rich deep water increased N 2 fixation rates and nifH gene abundances of selected clades including the unicellular diazotrophic cyanobacterium clade UCYN‐B. Elevated p CO 2 increased C fixation rates in the decay phase. We conclude that elevated p CO 2 and pulses of upwelling have pronounced effects on diazotrophy and primary producers, and upwelling and dust deposition modify the p CO 2 effect in natural assemblages. Article in Journal/Newspaper North Atlantic Wiley Online Library Limnology and Oceanography 66 7 2855 2867 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Dinitrogen (N 2 ) fixation is a major source of bioavailable nitrogen to oligotrophic ocean communities. Yet, we have limited understanding how ongoing climate change could alter N 2 fixation. Most of our understanding is based on short‐term laboratory experiments conducted on individual N 2 ‐fixing species whereas community‐level approaches are rare. In this longer‐term in situ mesocosm study, we aimed to improve our understanding on the role of rising atmospheric carbon dioxide (CO 2 ) and simulated deep water upwelling on N 2 and carbon (C) fixation rates in a natural oligotrophic plankton community. We deployed nine mesocosms in the subtropical North Atlantic Ocean and enriched seven of these with CO 2 to yield a range of treatments (partial pressure of CO 2 , p CO 2 = 352–1025 μatm). We measured rates of N 2 and C fixation in both light and dark incubations over the 55‐day study period. High p CO 2 negatively impacted light and dark N 2 fixation rates in the oligotrophic phase before simulated upwelling, while the effect reversed in the light N 2 fixation rates in the bloom decay phase after added nutrients were consumed. Dust deposition and simulated upwelling of nutrient‐rich deep water increased N 2 fixation rates and nifH gene abundances of selected clades including the unicellular diazotrophic cyanobacterium clade UCYN‐B. Elevated p CO 2 increased C fixation rates in the decay phase. We conclude that elevated p CO 2 and pulses of upwelling have pronounced effects on diazotrophy and primary producers, and upwelling and dust deposition modify the p CO 2 effect in natural assemblages. |
author2 |
Bundesministerium für Bildung und Forschung Exzellenzcluster Ozean der Zukunft H2020 Environment Villum Fonden Horizon 2020 Framework Programme ASCRS Research Foundation Bundesministerium für Bildung und Forschung |
format |
Article in Journal/Newspaper |
author |
Singh, Arvind Bach, Lennart T. Löscher, Carolin R. Paul, Allanah J. Ojha, Narendra Riebesell, Ulf |
spellingShingle |
Singh, Arvind Bach, Lennart T. Löscher, Carolin R. Paul, Allanah J. Ojha, Narendra Riebesell, Ulf Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
author_facet |
Singh, Arvind Bach, Lennart T. Löscher, Carolin R. Paul, Allanah J. Ojha, Narendra Riebesell, Ulf |
author_sort |
Singh, Arvind |
title |
Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
title_short |
Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
title_full |
Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
title_fullStr |
Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
title_full_unstemmed |
Impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
title_sort |
impact of increasing carbon dioxide on dinitrogen and carbon fixation rates under oligotrophic conditions and simulated upwelling |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11795 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11795 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11795 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11795 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Limnology and Oceanography volume 66, issue 7, page 2855-2867 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11795 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
7 |
container_start_page |
2855 |
op_container_end_page |
2867 |
_version_ |
1810464342327427072 |