Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean
The apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii , has recently been found to fix dinitrogen (N 2 ) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical...
Published in: | Frontiers in Marine Science |
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Online Access: | http://dx.doi.org/10.3389/fmars.2022.877562 https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/full |
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crfrontiers:10.3389/fmars.2022.877562 2024-09-15T17:53:44+00:00 Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean Selden, Corday R. Einarsson, Sveinn V. Lowry, Kate E. Crider, Katherine E. Pickart, Robert S. Lin, Peigen Ashjian, Carin J. Chappell, P. Dreux National Science Foundation National Oceanic and Atmospheric Administration Thomas F. and Kate Miller Jeffress Memorial Trust 2022 http://dx.doi.org/10.3389/fmars.2022.877562 https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 9 ISSN 2296-7745 journal-article 2022 crfrontiers https://doi.org/10.3389/fmars.2022.877562 2024-07-30T04:03:02Z The apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii , has recently been found to fix dinitrogen (N 2 ) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical oligotrophic ocean basins. This study presents the novel observation that this symbiosis increased in abundance during a wind-driven upwelling event along the Alaskan Beaufort shelfbreak. As upwelling relaxed, the relative abundance of B. bigelowii among eukaryotic phytoplankton increased most significantly in waters over the upper slope. As the host’s nitrogen demands are believed to be supplied primarily by UCYN-A, this response suggests that upwelling may enhance N 2 fixation as displaced coastal waters are advected offshore, potentially extending the duration of upwelling-induced phytoplankton blooms. Given that such events are projected to increase in intensity and number with ocean warming, upwelling-driven N 2 fixation as a feedback on climate merits investigation. Article in Journal/Newspaper Arctic Ocean Phytoplankton Frontiers (Publisher) Frontiers in Marine Science 9 |
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Frontiers (Publisher) |
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The apparently obligate symbiosis between the diazotroph Candidatus Atelocyanobacterium thalassa (UCYN-A) and its haptophyte host, Braarudosphaera bigelowii , has recently been found to fix dinitrogen (N 2 ) in polar waters at rates (per cell) comparable to those observed in the tropical/subtropical oligotrophic ocean basins. This study presents the novel observation that this symbiosis increased in abundance during a wind-driven upwelling event along the Alaskan Beaufort shelfbreak. As upwelling relaxed, the relative abundance of B. bigelowii among eukaryotic phytoplankton increased most significantly in waters over the upper slope. As the host’s nitrogen demands are believed to be supplied primarily by UCYN-A, this response suggests that upwelling may enhance N 2 fixation as displaced coastal waters are advected offshore, potentially extending the duration of upwelling-induced phytoplankton blooms. Given that such events are projected to increase in intensity and number with ocean warming, upwelling-driven N 2 fixation as a feedback on climate merits investigation. |
author2 |
National Science Foundation National Oceanic and Atmospheric Administration Thomas F. and Kate Miller Jeffress Memorial Trust |
format |
Article in Journal/Newspaper |
author |
Selden, Corday R. Einarsson, Sveinn V. Lowry, Kate E. Crider, Katherine E. Pickart, Robert S. Lin, Peigen Ashjian, Carin J. Chappell, P. Dreux |
spellingShingle |
Selden, Corday R. Einarsson, Sveinn V. Lowry, Kate E. Crider, Katherine E. Pickart, Robert S. Lin, Peigen Ashjian, Carin J. Chappell, P. Dreux Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
author_facet |
Selden, Corday R. Einarsson, Sveinn V. Lowry, Kate E. Crider, Katherine E. Pickart, Robert S. Lin, Peigen Ashjian, Carin J. Chappell, P. Dreux |
author_sort |
Selden, Corday R. |
title |
Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
title_short |
Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
title_full |
Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
title_fullStr |
Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
title_full_unstemmed |
Coastal upwelling enhances abundance of a symbiotic diazotroph (UCYN-A) and its haptophyte host in the Arctic Ocean |
title_sort |
coastal upwelling enhances abundance of a symbiotic diazotroph (ucyn-a) and its haptophyte host in the arctic ocean |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fmars.2022.877562 https://www.frontiersin.org/articles/10.3389/fmars.2022.877562/full |
genre |
Arctic Ocean Phytoplankton |
genre_facet |
Arctic Ocean Phytoplankton |
op_source |
Frontiers in Marine Science volume 9 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2022.877562 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1810429774712012800 |