Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition
Abstract The Ross Sea is a highly productive system characterized by a seasonal succession of phytoplankton groups. However, most of the current understanding is based on observations on the continental shelf in spring and summer at relatively coarse taxonomic resolution. Here, we characterize commu...
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Online Access: | http://dx.doi.org/10.1002/lno.12526 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12526 |
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crwiley:10.1002/lno.12526 2024-06-23T07:47:15+00:00 Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition Cristi, Antonia Law, Cliff S. Pinkerton, Matt Lopes dos Santos, Adriana Safi, Karl Gutiérrez‐Rodríguez, Andres Department of Marine Science, University of Otago 2024 http://dx.doi.org/10.1002/lno.12526 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12526 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 69, issue 4, page 772-788 ISSN 0024-3590 1939-5590 journal-article 2024 crwiley https://doi.org/10.1002/lno.12526 2024-05-31T08:13:19Z Abstract The Ross Sea is a highly productive system characterized by a seasonal succession of phytoplankton groups. However, most of the current understanding is based on observations on the continental shelf in spring and summer at relatively coarse taxonomic resolution. Here, we characterize community composition (class to species) using V4‐18S rRNA gene metabarcoding on transects to and across the Ross Sea (shelf‐slope and oceanic subregions) during two voyages covering the Austral summer–autumn progression in successive years. Phytoplankton composition shifted from low‐diversity diatom‐dominated (50%) communities during the summer to more diverse dinoflagellate‐dominated (48%) systems during the lower‐productivity autumn season. Prymnesiophyceae abundance was low on both voyages (10%), except on the southeast shelf‐slope, where Phaeocystis antarctica dominated a shallow mixed layer, contrary to its reported preference for deep‐mixing conditions. Amplicon sequence variant analysis identified distinct spatial patterns for two P. antarctica genotypes yet clustered certain species of Bacillariophyta and Prymnesiophyceae, indicating similar environmental preference for genotypes in these groups. Multivariate analysis of environmental drivers found a higher correlation of community composition variation with salinity and macronutrients, but less so with mixed layer depth, considered a primary determinant of taxonomic composition in the Ross Sea. Comparison between years established that community composition was temporally more stable in oceanic relative to shelf‐slope waters. This study of seasonal variation of phytoplankton community composition at finer taxonomic resolution provided insights into species‐ and strain‐specific distribution, ecological preferences, and relationships to environmental conditions in the wider Ross Sea to inform modeling and projection of future regional changes. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Wiley Online Library Austral Ross Sea Limnology and Oceanography 69 4 772 788 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The Ross Sea is a highly productive system characterized by a seasonal succession of phytoplankton groups. However, most of the current understanding is based on observations on the continental shelf in spring and summer at relatively coarse taxonomic resolution. Here, we characterize community composition (class to species) using V4‐18S rRNA gene metabarcoding on transects to and across the Ross Sea (shelf‐slope and oceanic subregions) during two voyages covering the Austral summer–autumn progression in successive years. Phytoplankton composition shifted from low‐diversity diatom‐dominated (50%) communities during the summer to more diverse dinoflagellate‐dominated (48%) systems during the lower‐productivity autumn season. Prymnesiophyceae abundance was low on both voyages (10%), except on the southeast shelf‐slope, where Phaeocystis antarctica dominated a shallow mixed layer, contrary to its reported preference for deep‐mixing conditions. Amplicon sequence variant analysis identified distinct spatial patterns for two P. antarctica genotypes yet clustered certain species of Bacillariophyta and Prymnesiophyceae, indicating similar environmental preference for genotypes in these groups. Multivariate analysis of environmental drivers found a higher correlation of community composition variation with salinity and macronutrients, but less so with mixed layer depth, considered a primary determinant of taxonomic composition in the Ross Sea. Comparison between years established that community composition was temporally more stable in oceanic relative to shelf‐slope waters. This study of seasonal variation of phytoplankton community composition at finer taxonomic resolution provided insights into species‐ and strain‐specific distribution, ecological preferences, and relationships to environmental conditions in the wider Ross Sea to inform modeling and projection of future regional changes. |
author2 |
Department of Marine Science, University of Otago |
format |
Article in Journal/Newspaper |
author |
Cristi, Antonia Law, Cliff S. Pinkerton, Matt Lopes dos Santos, Adriana Safi, Karl Gutiérrez‐Rodríguez, Andres |
spellingShingle |
Cristi, Antonia Law, Cliff S. Pinkerton, Matt Lopes dos Santos, Adriana Safi, Karl Gutiérrez‐Rodríguez, Andres Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
author_facet |
Cristi, Antonia Law, Cliff S. Pinkerton, Matt Lopes dos Santos, Adriana Safi, Karl Gutiérrez‐Rodríguez, Andres |
author_sort |
Cristi, Antonia |
title |
Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
title_short |
Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
title_full |
Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
title_fullStr |
Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
title_full_unstemmed |
Environmental driving forces and phytoplankton diversity across the Ross Sea region during a summer–autumn transition |
title_sort |
environmental driving forces and phytoplankton diversity across the ross sea region during a summer–autumn transition |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/lno.12526 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12526 |
geographic |
Austral Ross Sea |
geographic_facet |
Austral Ross Sea |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_source |
Limnology and Oceanography volume 69, issue 4, page 772-788 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12526 |
container_title |
Limnology and Oceanography |
container_volume |
69 |
container_issue |
4 |
container_start_page |
772 |
op_container_end_page |
788 |
_version_ |
1802651339125161984 |