SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean
Abstract The ecology of the SAR11 clade, the most abundant bacterial group in the ocean, has been intensively studied in temperate and tropical regions, but its distribution remains largely unexplored in the Southern Ocean. Through amplicon sequencing of the 16S rRNA gene, we assessed the contributi...
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crwiley:10.1111/1758-2229.13117 2024-09-30T14:43:57+00:00 SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean Dinasquet, Julie Landa, Marine Obernosterer, Ingrid 2022 http://dx.doi.org/10.1111/1758-2229.13117 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1758-2229.13117 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1758-2229.13117 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Environmental Microbiology Reports volume 14, issue 6, page 907-916 ISSN 1758-2229 1758-2229 journal-article 2022 crwiley https://doi.org/10.1111/1758-2229.13117 2024-09-03T04:24:33Z Abstract The ecology of the SAR11 clade, the most abundant bacterial group in the ocean, has been intensively studied in temperate and tropical regions, but its distribution remains largely unexplored in the Southern Ocean. Through amplicon sequencing of the 16S rRNA gene, we assessed the contribution of the SAR11 clade to bacterial community composition in the naturally iron fertilized region off Kerguelen Island. We investigated the upper 300 m at seven sites located in early spring phytoplankton blooms and at one high‐nutrient low‐chlorophyll site. Despite pronounced vertical patterns of the bacterioplankton assemblages, the SAR11 clade had high relative abundances at all depths and sites, averaging 40% (±15%) of the total community relative abundance. Micro‐autoradiography combined with CARD‐FISH further revealed that the clade had an overall stable contribution (45%–60% in surface waters) to bacterial biomass production (determined by 3 H‐leucine incorporation) during different early bloom stages. The spatio‐temporal partitioning of some of the SAR11 subclades suggests a niche specificity and periodic selection of different subclades in response to the fluctuating extreme conditions of the Southern Ocean. These observations improve our understanding of the ecology of the SAR11 clade and its implications in biogeochemical cycles in the rapidly changing Southern Ocean. Article in Journal/Newspaper Southern Ocean Wiley Online Library Southern Ocean Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) Environmental Microbiology Reports |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The ecology of the SAR11 clade, the most abundant bacterial group in the ocean, has been intensively studied in temperate and tropical regions, but its distribution remains largely unexplored in the Southern Ocean. Through amplicon sequencing of the 16S rRNA gene, we assessed the contribution of the SAR11 clade to bacterial community composition in the naturally iron fertilized region off Kerguelen Island. We investigated the upper 300 m at seven sites located in early spring phytoplankton blooms and at one high‐nutrient low‐chlorophyll site. Despite pronounced vertical patterns of the bacterioplankton assemblages, the SAR11 clade had high relative abundances at all depths and sites, averaging 40% (±15%) of the total community relative abundance. Micro‐autoradiography combined with CARD‐FISH further revealed that the clade had an overall stable contribution (45%–60% in surface waters) to bacterial biomass production (determined by 3 H‐leucine incorporation) during different early bloom stages. The spatio‐temporal partitioning of some of the SAR11 subclades suggests a niche specificity and periodic selection of different subclades in response to the fluctuating extreme conditions of the Southern Ocean. These observations improve our understanding of the ecology of the SAR11 clade and its implications in biogeochemical cycles in the rapidly changing Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Dinasquet, Julie Landa, Marine Obernosterer, Ingrid |
spellingShingle |
Dinasquet, Julie Landa, Marine Obernosterer, Ingrid SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
author_facet |
Dinasquet, Julie Landa, Marine Obernosterer, Ingrid |
author_sort |
Dinasquet, Julie |
title |
SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
title_short |
SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
title_full |
SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
title_fullStr |
SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
title_full_unstemmed |
SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean |
title_sort |
sar11 clade microdiversity and activity during the early spring blooms off kerguelen island, southern ocean |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1111/1758-2229.13117 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1758-2229.13117 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1758-2229.13117 |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Southern Ocean Kerguelen Kerguelen Island |
geographic_facet |
Southern Ocean Kerguelen Kerguelen Island |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Environmental Microbiology Reports volume 14, issue 6, page 907-916 ISSN 1758-2229 1758-2229 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1758-2229.13117 |
container_title |
Environmental Microbiology Reports |
_version_ |
1811645506300936192 |