Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea)
Abstract The contiguous Arctic shelf is the green belt of the Arctic Ocean. Phytoplankton dynamics in this environment are driven by extreme physical gradients and by rapid climate change, which influence light and nutrient availability as well as the growth and ecological characteristics of phytopl...
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crwiley:10.1002/lno.10554 2024-09-15T17:53:18+00:00 Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) Ardyna, M. Babin, M. Devred, E. Forest, A. Gosselin, M. Raimbault, P. Tremblay, J.‐É. Canada Excellence Research Chairs, Government of Canada Centre National de la Recherche Scientifique Networks of Centres of Excellence of Canada Natural Sciences and Engineering Research Council of Canada Fonds de Recherche du Québec - Nature et Technologies 2017 http://dx.doi.org/10.1002/lno.10554 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10554 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10554 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 62, issue 5, page 2113-2132 ISSN 0024-3590 1939-5590 journal-article 2017 crwiley https://doi.org/10.1002/lno.10554 2024-08-30T04:09:39Z Abstract The contiguous Arctic shelf is the green belt of the Arctic Ocean. Phytoplankton dynamics in this environment are driven by extreme physical gradients and by rapid climate change, which influence light and nutrient availability as well as the growth and ecological characteristics of phytoplankton. A large dataset collected across the Canadian Beaufort Shelf during summer 2009 was analyzed to assess how the interplay of physical and biogeochemical conditions dictates phytoplankton niches and trophic regimes. Nonmetric multidimensional scaling and cluster analysis demonstrated marked partitioning of phytoplankton diversity. Elevated phytoplankton biomass (∼ 2.41 μg Chl a L −1 ) was observed in association with the surface mixed layer near the coast, close to the mouth of the Mackenzie River, and at the shelf‐break as a result of nutrient‐rich Pacific water intrusions. The coastal communities were supported by high levels of nitrogen nutrients and were taxonomically uniform, with diatoms accounting for 95% of total cell numbers. By contrast, adjacent oceanic waters were characterized by low autotrophic biomass near the surface (∼ 0.09 μg Chl a L −1 ) and below the mixed layer (∼ 0.23 μg Chl a L −1 ) due to mainly nutrient limitation. However, the oceanic community was more diverse with a mixed assemblage of diatoms and small mixotrophs/heterotrophs near the surface and a predominance of autotrophic nanoflagellates at depth. We conclude that as climate change intensifies freshening and stratification in the Western Arctic Ocean, coastal hotspots of high autotrophic productivity may play an even greater role in supporting Arctic marine ecosystems while offshore environments become increasingly oligotrophic. Article in Journal/Newspaper Arctic Ocean Beaufort Sea Climate change Mackenzie river Phytoplankton Wiley Online Library Limnology and Oceanography 62 5 2113 2132 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Abstract The contiguous Arctic shelf is the green belt of the Arctic Ocean. Phytoplankton dynamics in this environment are driven by extreme physical gradients and by rapid climate change, which influence light and nutrient availability as well as the growth and ecological characteristics of phytoplankton. A large dataset collected across the Canadian Beaufort Shelf during summer 2009 was analyzed to assess how the interplay of physical and biogeochemical conditions dictates phytoplankton niches and trophic regimes. Nonmetric multidimensional scaling and cluster analysis demonstrated marked partitioning of phytoplankton diversity. Elevated phytoplankton biomass (∼ 2.41 μg Chl a L −1 ) was observed in association with the surface mixed layer near the coast, close to the mouth of the Mackenzie River, and at the shelf‐break as a result of nutrient‐rich Pacific water intrusions. The coastal communities were supported by high levels of nitrogen nutrients and were taxonomically uniform, with diatoms accounting for 95% of total cell numbers. By contrast, adjacent oceanic waters were characterized by low autotrophic biomass near the surface (∼ 0.09 μg Chl a L −1 ) and below the mixed layer (∼ 0.23 μg Chl a L −1 ) due to mainly nutrient limitation. However, the oceanic community was more diverse with a mixed assemblage of diatoms and small mixotrophs/heterotrophs near the surface and a predominance of autotrophic nanoflagellates at depth. We conclude that as climate change intensifies freshening and stratification in the Western Arctic Ocean, coastal hotspots of high autotrophic productivity may play an even greater role in supporting Arctic marine ecosystems while offshore environments become increasingly oligotrophic. |
author2 |
Canada Excellence Research Chairs, Government of Canada Centre National de la Recherche Scientifique Networks of Centres of Excellence of Canada Natural Sciences and Engineering Research Council of Canada Fonds de Recherche du Québec - Nature et Technologies |
format |
Article in Journal/Newspaper |
author |
Ardyna, M. Babin, M. Devred, E. Forest, A. Gosselin, M. Raimbault, P. Tremblay, J.‐É. |
spellingShingle |
Ardyna, M. Babin, M. Devred, E. Forest, A. Gosselin, M. Raimbault, P. Tremblay, J.‐É. Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
author_facet |
Ardyna, M. Babin, M. Devred, E. Forest, A. Gosselin, M. Raimbault, P. Tremblay, J.‐É. |
author_sort |
Ardyna, M. |
title |
Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
title_short |
Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
title_full |
Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
title_fullStr |
Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
title_full_unstemmed |
Shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal Arctic Ocean (Beaufort Sea) |
title_sort |
shelf‐basin gradients shape ecological phytoplankton niches and community composition in the coastal arctic ocean (beaufort sea) |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/lno.10554 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10554 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10554 |
genre |
Arctic Ocean Beaufort Sea Climate change Mackenzie river Phytoplankton |
genre_facet |
Arctic Ocean Beaufort Sea Climate change Mackenzie river Phytoplankton |
op_source |
Limnology and Oceanography volume 62, issue 5, page 2113-2132 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.10554 |
container_title |
Limnology and Oceanography |
container_volume |
62 |
container_issue |
5 |
container_start_page |
2113 |
op_container_end_page |
2132 |
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1810295330749546496 |