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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Main Authors: | , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://insu.hal.science/insu-03664866 https://insu.hal.science/insu-03664866/document https://insu.hal.science/insu-03664866/file/S0924796321000294.pdf https://doi.org/10.1016/j.jmarsys.2021.103531 |
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ftinsu:oai:HAL:insu-03664866v1 |
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openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDU]Sciences of the Universe [physics] |
spellingShingle |
Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDU]Sciences of the Universe [physics] 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 [SDU]Sciences of the Universe [physics] |
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 |
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 ) Université du Littoral Côte d'Opale (ULCO) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) |
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 |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03664866 https://insu.hal.science/insu-03664866/document https://insu.hal.science/insu-03664866/file/S0924796321000294.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://insu.hal.science/insu-03664866 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 insu-03664866 https://insu.hal.science/insu-03664866 https://insu.hal.science/insu-03664866/document https://insu.hal.science/insu-03664866/file/S0924796321000294.pdf BIBCODE: 2021JMS.21903531C doi:10.1016/j.jmarsys.2021.103531 PII: S0924-7963(21)00029-4 |
op_rights |
http://creativecommons.org/licenses/by-nc/ 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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1790609675302993920 |
spelling |
ftinsu:oai:HAL:insu-03664866v1 2024-02-11T09:57:23+01:00 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 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 ) Université du Littoral Côte d'Opale (ULCO) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) 2021-07 https://insu.hal.science/insu-03664866 https://insu.hal.science/insu-03664866/document https://insu.hal.science/insu-03664866/file/S0924796321000294.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 insu-03664866 https://insu.hal.science/insu-03664866 https://insu.hal.science/insu-03664866/document https://insu.hal.science/insu-03664866/file/S0924796321000294.pdf BIBCODE: 2021JMS.21903531C doi:10.1016/j.jmarsys.2021.103531 PII: S0924-7963(21)00029-4 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess ISSN: 0924-7963 Journal of Marine Systems https://insu.hal.science/insu-03664866 Journal of Marine Systems, 2021, 219, pp.103531. ⟨10.1016/j.jmarsys.2021.103531⟩ Dinoflagellates Ciliates Microscopy Metabarcoding Dilution experiments Southern Ocean Microzooplankton Diversity [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.1016/j.jmarsys.2021.103531 2024-01-24T17:26:52Z 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 Institut national des sciences de l'Univers: HAL-INSU Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 219 103531 |