Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes
Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates,...
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Language: | English |
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Elsevier BV
2021
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Online Access: | https://archimer.ifremer.fr/doc/00689/80068/83085.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 https://archimer.ifremer.fr/doc/00689/80068/ |
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ftarchimer:oai:archimer.ifremer.fr:80068 2023-05-15T13:47:37+02:00 Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes Christaki, Urania Skouroliakou, Ioli-dimitra Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid 2021-07 application/pdf https://archimer.ifremer.fr/doc/00689/80068/83085.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 https://archimer.ifremer.fr/doc/00689/80068/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00689/80068/83085.pdf doi:10.1016/j.jmarsys.2021.103531 https://archimer.ifremer.fr/doc/00689/80068/ info:eu-repo/semantics/openAccess restricted use Journal Of Marine Systems (0924-7963) (Elsevier BV), 2021-07 , Vol. 219 , P. 103531 (16p.) Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1016/j.jmarsys.2021.103531 2022-07-12T22:50:15Z Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates, DIN and Ciliates, CIL), community structure, interaction with phytoplankton and its potential in channeling carbon to higher trophic levels were studied in contrasting productivity regimes (off- and on-plateau, the latter been naturally fertilized by iron) around the Kerguelen islands in the Southern Ocean (SO). DIN and CIL diversity was sampled in late summer (February–March 2018; project MOBYDICK) and at the onset-of the bloom (KEOPS2 cruise), and assessed by Illumina sequencing of 18S rDNA amplicons and microscopic observations. The diversity obtained by the two approaches could be compared at a relatively high taxonomic level (i.e., often to family level). In particular for DIN, relative abundances and ranking of dominant taxa differed between sequencing and microscopy observations. CIL were always recorded at considerably lower abundances than DIN, the median of their abundances across stations and seasons being 350 and 1370 cells L−1, respectively. During late summer, DIN and CIL biomasses were about 1.5 times higher on- than in off-plateau waters, while community composition was spatially similar. The most abundant DIN at all stations and during both seasons were small Gymnodinium (<20 μm). During late summer, ciliates Lohmaniella oviformis (<20 μm) and Cymatocylis antarctica (20-40 μm) dominated on- and off-plateau, respectively. Dilution experiments suggested significant grazing of microzooplankton on phytoplankton as phytoplankton net growth (k) was lower than microzooplankton grazing (g) at all stations (mean k = 0.16 ± 0.05 d−1, g = 0.36 ± 0.09 d−1) in late summer. Despite having great potential as a phytoplankton grazer, microzooplankton occurred at low biomass and showed little temporal ... Article in Journal/Newspaper Antarc* Antarctica Kerguelen Islands Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 219 103531 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity |
spellingShingle |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity Christaki, Urania Skouroliakou, Ioli-dimitra Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
topic_facet |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity |
description |
Microzooplankton play an important role in aquatic food webs through their multiple interactions with other organisms and their impact on carbon export. They are major predators of phytoplankton and bacteria while being preyed on by higher trophic levels. Microzooplankton diversity (Dinoflagellates, DIN and Ciliates, CIL), community structure, interaction with phytoplankton and its potential in channeling carbon to higher trophic levels were studied in contrasting productivity regimes (off- and on-plateau, the latter been naturally fertilized by iron) around the Kerguelen islands in the Southern Ocean (SO). DIN and CIL diversity was sampled in late summer (February–March 2018; project MOBYDICK) and at the onset-of the bloom (KEOPS2 cruise), and assessed by Illumina sequencing of 18S rDNA amplicons and microscopic observations. The diversity obtained by the two approaches could be compared at a relatively high taxonomic level (i.e., often to family level). In particular for DIN, relative abundances and ranking of dominant taxa differed between sequencing and microscopy observations. CIL were always recorded at considerably lower abundances than DIN, the median of their abundances across stations and seasons being 350 and 1370 cells L−1, respectively. During late summer, DIN and CIL biomasses were about 1.5 times higher on- than in off-plateau waters, while community composition was spatially similar. The most abundant DIN at all stations and during both seasons were small Gymnodinium (<20 μm). During late summer, ciliates Lohmaniella oviformis (<20 μm) and Cymatocylis antarctica (20-40 μm) dominated on- and off-plateau, respectively. Dilution experiments suggested significant grazing of microzooplankton on phytoplankton as phytoplankton net growth (k) was lower than microzooplankton grazing (g) at all stations (mean k = 0.16 ± 0.05 d−1, g = 0.36 ± 0.09 d−1) in late summer. Despite having great potential as a phytoplankton grazer, microzooplankton occurred at low biomass and showed little temporal ... |
format |
Article in Journal/Newspaper |
author |
Christaki, Urania Skouroliakou, Ioli-dimitra Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid |
author_facet |
Christaki, Urania Skouroliakou, Ioli-dimitra Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid |
author_sort |
Christaki, Urania |
title |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_short |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_full |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_fullStr |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_full_unstemmed |
Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes |
title_sort |
microzooplankton diversity and potential role in carbon cycling of contrasting southern ocean productivity regimes |
publisher |
Elsevier BV |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00689/80068/83085.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 https://archimer.ifremer.fr/doc/00689/80068/ |
geographic |
Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Islands Southern Ocean |
genre |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctica Kerguelen Islands Southern Ocean |
op_source |
Journal Of Marine Systems (0924-7963) (Elsevier BV), 2021-07 , Vol. 219 , P. 103531 (16p.) |
op_relation |
https://archimer.ifremer.fr/doc/00689/80068/83085.pdf doi:10.1016/j.jmarsys.2021.103531 https://archimer.ifremer.fr/doc/00689/80068/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.jmarsys.2021.103531 |
container_title |
Journal of Marine Systems |
container_volume |
219 |
container_start_page |
103531 |
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1766247537703911424 |