Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes
International audience Spatial and seasonal dynamics of microbial loop fluxes were investigated in contrasting productivity regimes in the Indian sector of the Southern Ocean. Observations carried out in late summer (February-March 2018; project MOBYDICK) revealed higher microbial biomasses and flux...
Published in: | Limnology and Oceanography |
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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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Online Access: | https://univ-poitiers.hal.science/hal-03034631 https://univ-poitiers.hal.science/hal-03034631/document https://univ-poitiers.hal.science/hal-03034631/file/Christaki_2020_HAL.pdf https://doi.org/10.1002/lno.11591 |
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ftuniparissaclay:oai:HAL:hal-03034631v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
acl productivity regimes Southern Ocean fluxes Microbial food web [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
acl productivity regimes Southern Ocean fluxes Microbial food web [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Chistaki, Urania Gueneugues, Audrey Liu, Yan Blain, Stéphane Catala, Philippe Colombet, Jonathan Debeljak, Pavla Jardillier, Ludwig Irion, Solène Planchon, Frédéric Sassenhagen, Ingrid Sime-Ngando, Télesphore Obernosterer, Ingrid Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
topic_facet |
acl productivity regimes Southern Ocean fluxes Microbial food web [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
International audience Spatial and seasonal dynamics of microbial loop fluxes were investigated in contrasting productivity regimes in the Indian sector of the Southern Ocean. Observations carried out in late summer (February-March 2018; project MOBYDICK) revealed higher microbial biomasses and fluxes in the naturally iron-fertilized surface waters of Kerguelen island in comparison to surrounding off-plateau waters. Differences were most pronounced for bacterial heterotrophic production (2.3-fold), the abundance of heterotrophic nanoflagellates (HNF; 2.7-fold). Independent of site, grazing by HNF was the main loss process of bacterial production (80-100%), while virus-induced mortality was low (< 9%). Combining these results with observations from previous investigations during early spring and summer allowed us to describe seasonal patterns in microbial food web fluxes and to compare these to carbon export in the iron-fertilized and highnutrient, low-chlorophyll (HNLC) Southern Ocean. Our data suggest an overall less efficient microbial food web during spring and summer, when respiration and viral lysis, respectively, represent important loss terms of bacterially-mediated carbon. In late summer, primary production is more efficiently transferred to bacterial biomass and HNF and thus available for higher trophic levels. These results provide a new insight into the seasonal variability and the quantitative importance of microbial food web processes for the fate of primary production in the Southern Ocean. |
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) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Microorganismes : Génome et Environnement (LMGE) Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) We thank B. Queguiner, the PI of the MOBYDICK project, for providing us the opportunity to participate to this cruise, the captain and crew of the R/V Marion Dufresne for their enthusiasm and support aboard during the MOBYDICK-THEMISTO cruise (https://doi.org/10.17600/18000403) and the chief scientist I. Obernosterer. This work was supported by the French oceanographic fleet ("Flotte oceanographique francaise"), the French ANR ("Agence Nationale de la Recherche", AAPG 2017 program, MOBYDICK Project number: ANR-17-CE01-0013), and the French Research program of INSU-CNRS LEFE/CYBER ("Les enveloppes fluides et l'environnement"-"Cycles biogeochimiques, environnement et ressources"). This work was also supported by ULCO (Universite du Littoral) and CPER MARCO (https://marco.univ-littoral.fr/).We thank three anonymous reviewers and the editors for their comments which helped to improve this work. 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 |
Chistaki, Urania Gueneugues, Audrey Liu, Yan Blain, Stéphane Catala, Philippe Colombet, Jonathan Debeljak, Pavla Jardillier, Ludwig Irion, Solène Planchon, Frédéric Sassenhagen, Ingrid Sime-Ngando, Télesphore Obernosterer, Ingrid |
author_facet |
Chistaki, Urania Gueneugues, Audrey Liu, Yan Blain, Stéphane Catala, Philippe Colombet, Jonathan Debeljak, Pavla Jardillier, Ludwig Irion, Solène Planchon, Frédéric Sassenhagen, Ingrid Sime-Ngando, Télesphore Obernosterer, Ingrid |
author_sort |
Chistaki, Urania |
title |
Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
title_short |
Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
title_full |
Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
title_fullStr |
Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
title_full_unstemmed |
Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes |
title_sort |
seasonal microbial food web dynamics in contrasting southern ocean productivity regimes |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://univ-poitiers.hal.science/hal-03034631 https://univ-poitiers.hal.science/hal-03034631/document https://univ-poitiers.hal.science/hal-03034631/file/Christaki_2020_HAL.pdf https://doi.org/10.1002/lno.11591 |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Southern Ocean Kerguelen Indian Kerguelen Island |
geographic_facet |
Southern Ocean Kerguelen Indian Kerguelen Island |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://univ-poitiers.hal.science/hal-03034631 Limnology and Oceanography, 2021, 66 (1), pp.108-122. ⟨10.1002/lno.11591⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11591 hal-03034631 https://univ-poitiers.hal.science/hal-03034631 https://univ-poitiers.hal.science/hal-03034631/document https://univ-poitiers.hal.science/hal-03034631/file/Christaki_2020_HAL.pdf doi:10.1002/lno.11591 WOS: 000569169700001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/lno.11591 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
1 |
container_start_page |
108 |
op_container_end_page |
122 |
_version_ |
1802650278013435904 |
spelling |
ftuniparissaclay:oai:HAL:hal-03034631v1 2024-06-23T07:56:54+00:00 Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes Chistaki, Urania Gueneugues, Audrey Liu, Yan Blain, Stéphane Catala, Philippe Colombet, Jonathan Debeljak, Pavla Jardillier, Ludwig Irion, Solène Planchon, Frédéric Sassenhagen, Ingrid Sime-Ngando, Télesphore Obernosterer, 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) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Microorganismes : Génome et Environnement (LMGE) Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) We thank B. Queguiner, the PI of the MOBYDICK project, for providing us the opportunity to participate to this cruise, the captain and crew of the R/V Marion Dufresne for their enthusiasm and support aboard during the MOBYDICK-THEMISTO cruise (https://doi.org/10.17600/18000403) and the chief scientist I. Obernosterer. This work was supported by the French oceanographic fleet ("Flotte oceanographique francaise"), the French ANR ("Agence Nationale de la Recherche", AAPG 2017 program, MOBYDICK Project number: ANR-17-CE01-0013), and the French Research program of INSU-CNRS LEFE/CYBER ("Les enveloppes fluides et l'environnement"-"Cycles biogeochimiques, environnement et ressources"). This work was also supported by ULCO (Universite du Littoral) and CPER MARCO (https://marco.univ-littoral.fr/).We thank three anonymous reviewers and the editors for their comments which helped to improve this work. ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) 2021-01 https://univ-poitiers.hal.science/hal-03034631 https://univ-poitiers.hal.science/hal-03034631/document https://univ-poitiers.hal.science/hal-03034631/file/Christaki_2020_HAL.pdf https://doi.org/10.1002/lno.11591 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11591 hal-03034631 https://univ-poitiers.hal.science/hal-03034631 https://univ-poitiers.hal.science/hal-03034631/document https://univ-poitiers.hal.science/hal-03034631/file/Christaki_2020_HAL.pdf doi:10.1002/lno.11591 WOS: 000569169700001 info:eu-repo/semantics/OpenAccess ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://univ-poitiers.hal.science/hal-03034631 Limnology and Oceanography, 2021, 66 (1), pp.108-122. ⟨10.1002/lno.11591⟩ acl productivity regimes Southern Ocean fluxes Microbial food web [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/article Journal articles 2021 ftuniparissaclay https://doi.org/10.1002/lno.11591 2024-06-06T23:43:18Z International audience Spatial and seasonal dynamics of microbial loop fluxes were investigated in contrasting productivity regimes in the Indian sector of the Southern Ocean. Observations carried out in late summer (February-March 2018; project MOBYDICK) revealed higher microbial biomasses and fluxes in the naturally iron-fertilized surface waters of Kerguelen island in comparison to surrounding off-plateau waters. Differences were most pronounced for bacterial heterotrophic production (2.3-fold), the abundance of heterotrophic nanoflagellates (HNF; 2.7-fold). Independent of site, grazing by HNF was the main loss process of bacterial production (80-100%), while virus-induced mortality was low (< 9%). Combining these results with observations from previous investigations during early spring and summer allowed us to describe seasonal patterns in microbial food web fluxes and to compare these to carbon export in the iron-fertilized and highnutrient, low-chlorophyll (HNLC) Southern Ocean. Our data suggest an overall less efficient microbial food web during spring and summer, when respiration and viral lysis, respectively, represent important loss terms of bacterially-mediated carbon. In late summer, primary production is more efficiently transferred to bacterial biomass and HNF and thus available for higher trophic levels. These results provide a new insight into the seasonal variability and the quantitative importance of microbial food web processes for the fate of primary production in the Southern Ocean. Article in Journal/Newspaper Southern Ocean Archives ouvertes de Paris-Saclay Southern Ocean Kerguelen Indian Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) Limnology and Oceanography 66 1 108 122 |