Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes
International audience 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 dive...
Published in: | Journal of Marine Systems |
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Online Access: | https://hal.science/hal-04265309 https://hal.science/hal-04265309/document https://hal.science/hal-04265309/file/Christaki%20et%20al.%20-%202021%20-%20Microzooplankton%20diversity%20and%20potential%20role%20in%20c.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 |
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ftunivlcoteopale:oai:HAL:hal-04265309v1 2024-06-23T07:47:07+00:00 Microzooplankton diversity and potential role in carbon cycling of contrasting Southern Ocean productivity regimes Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid Université du Littoral Côte d'Opale (ULCO) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 2021-04-07 https://hal.science/hal-04265309 https://hal.science/hal-04265309/document https://hal.science/hal-04265309/file/Christaki%20et%20al.%20-%202021%20-%20Microzooplankton%20diversity%20and%20potential%20role%20in%20c.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103531 hal-04265309 https://hal.science/hal-04265309 https://hal.science/hal-04265309/document https://hal.science/hal-04265309/file/Christaki%20et%20al.%20-%202021%20-%20Microzooplankton%20diversity%20and%20potential%20role%20in%20c.pdf doi:10.1016/j.jmarsys.2021.103531 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-04265309 Journal of Marine Systems, 2021, 219, pp.103531. ⟨10.1016/j.jmarsys.2021.103531⟩ Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2021 ftunivlcoteopale https://doi.org/10.1016/j.jmarsys.2021.103531 2024-06-06T23:33:58Z International audience 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 ... Article in Journal/Newspaper Antarc* Antarctica Kerguelen Islands Southern Ocean Université du Littoral Côte d'Opale portail Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 219 103531 |
institution |
Open Polar |
collection |
Université du Littoral Côte d'Opale portail |
op_collection_id |
ftunivlcoteopale |
language |
English |
topic |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDV]Life Sciences [q-bio] |
spellingShingle |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDV]Life Sciences [q-bio] Christaki, Urania Skouroliakou, Dimitra-Ioli 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 [SDV]Life Sciences [q-bio] |
description |
International audience 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 ... |
author2 |
Université du Littoral Côte d'Opale (ULCO) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) |
format |
Article in Journal/Newspaper |
author |
Christaki, Urania Skouroliakou, Dimitra-Ioli Delegrange, Alice Irion, Solène Courcot, Lucie Jardillier, Ludwig Sassenhagen, Ingrid |
author_facet |
Christaki, Urania Skouroliakou, Dimitra-Ioli 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 |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-04265309 https://hal.science/hal-04265309/document https://hal.science/hal-04265309/file/Christaki%20et%20al.%20-%202021%20-%20Microzooplankton%20diversity%20and%20potential%20role%20in%20c.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 |
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 |
ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-04265309 Journal of Marine Systems, 2021, 219, pp.103531. ⟨10.1016/j.jmarsys.2021.103531⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103531 hal-04265309 https://hal.science/hal-04265309 https://hal.science/hal-04265309/document https://hal.science/hal-04265309/file/Christaki%20et%20al.%20-%202021%20-%20Microzooplankton%20diversity%20and%20potential%20role%20in%20c.pdf doi:10.1016/j.jmarsys.2021.103531 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
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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1802651064883740672 |