Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes

International audience Particles located at the interface between the surface ocean layer and the top of the mesopelagic domain are the initial vector of the biological pump yet, their nature is still largely unknown. During the MOBYDICK cruise in the vicinity of the Kerguelen Islands (Indian sector...

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Published in:Journal of Marine Systems
Main Authors: Leblanc, Karine, Augustin, Lafond, Cornet, Veronique, Legras, Justine, Barbara, Marie, Quéguiner, Bernard, Lafond, Karine, Marie, Barbara
Other Authors: Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Laboratoire d'Océanographie Microbienne (LOMIC), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2021
Subjects:
Online Access:https://hal.archives-ouvertes.fr/hal-03450616
https://hal.archives-ouvertes.fr/hal-03450616/document
https://hal.archives-ouvertes.fr/hal-03450616/file/Leblanc-17-12-20-subm.pdf
https://doi.org/10.1016/j.jmarsys.2021.103609
id ftccsdartic:oai:HAL:hal-03450616v1
record_format openpolar
institution Open Polar
collection Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
op_collection_id ftccsdartic
language English
topic Diversit
y Deep particle stocks
Southern Ocean
Mortality modes
Diatoms
Biological carbon pump
diversity
deep particle stocks
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
spellingShingle Diversit
y Deep particle stocks
Southern Ocean
Mortality modes
Diatoms
Biological carbon pump
diversity
deep particle stocks
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Leblanc, Karine
Augustin, Lafond
Cornet, Veronique
Legras, Justine
Barbara, Marie
Quéguiner, Bernard
Lafond, Karine
Marie, Barbara
Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
topic_facet Diversit
y Deep particle stocks
Southern Ocean
Mortality modes
Diatoms
Biological carbon pump
diversity
deep particle stocks
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
description International audience Particles located at the interface between the surface ocean layer and the top of the mesopelagic domain are the initial vector of the biological pump yet, their nature is still largely unknown. During the MOBYDICK cruise in the vicinity of the Kerguelen Islands (Indian sector of the Southern Ocean) we deployed a recently available device that concentrates and collects deep particles over a predetermined layer of water. In this paper, we present a detailed description of the collected particles and individual planktonic cells, including their taxonomy, carbon and lipid content, as well as cell viability, in order to characterize the particle stocks present at depth. The cruise was carried out at the end of the summer bloom, a period characterized by declining stocks of biogenic material associated with various mortality processes of planktonic organisms. Unexpectedly, the majority of the collected particles consisted of single empty diatom frustules, while fecal pellets and aggregates accounted for only a minor fraction. Distinct mortality processes, from parasitic infection to mesozooplankton grazing, and distinct silicification degrees as well as different life stages could be identified in relation to diatom taxa suggesting the occurrence of several export modes to intermediate and deep layers within the diatom community. We observed a dominant contribution of single cell diatoms (93 ± 6%) to the deep particle stocks but a very small contribution of intact diatom cells (~0.3%) to C content in the intermediate layer (1-00 m), together with a very small fecal pellet contribution, that was dominated by the minipellet size-class. Taxonomical analyses revealed distinct communities west of Kerguelen in the NLC area compared to the island s fertilized plateau and its eastern ank. Differences in silicification degrees as well as distinct mortality export processes linked to surface nutrient depletion and trophic interactions (such as parasitic infection or grazing by phaeodarians) were ...
author2 Institut méditerranéen d'océanologie (MIO)
Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)
Laboratoire d'Océanographie Microbienne (LOMIC)
Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Banyuls (OOB)
Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
format Article in Journal/Newspaper
author Leblanc, Karine
Augustin, Lafond
Cornet, Veronique
Legras, Justine
Barbara, Marie
Quéguiner, Bernard
Lafond, Karine
Marie, Barbara
author_facet Leblanc, Karine
Augustin, Lafond
Cornet, Veronique
Legras, Justine
Barbara, Marie
Quéguiner, Bernard
Lafond, Karine
Marie, Barbara
author_sort Leblanc, Karine
title Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
title_short Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
title_full Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
title_fullStr Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
title_full_unstemmed Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
title_sort deep particle stocks following the summer bloom around the kerguelen islands: insights into diatoms physiological state, community structure and mortality modes
publisher HAL CCSD
publishDate 2021
url https://hal.archives-ouvertes.fr/hal-03450616
https://hal.archives-ouvertes.fr/hal-03450616/document
https://hal.archives-ouvertes.fr/hal-03450616/file/Leblanc-17-12-20-subm.pdf
https://doi.org/10.1016/j.jmarsys.2021.103609
geographic Indian
Kerguelen
Kerguelen Islands
Southern Ocean
geographic_facet Indian
Kerguelen
Kerguelen Islands
Southern Ocean
genre Kerguelen Islands
Southern Ocean
genre_facet Kerguelen Islands
Southern Ocean
op_source ISSN: 0924-7963
Journal of Marine Systems
https://hal.archives-ouvertes.fr/hal-03450616
Journal of Marine Systems, Elsevier, 2021, 222, pp.103609. ⟨10.1016/j.jmarsys.2021.103609⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103609
hal-03450616
https://hal.archives-ouvertes.fr/hal-03450616
https://hal.archives-ouvertes.fr/hal-03450616/document
https://hal.archives-ouvertes.fr/hal-03450616/file/Leblanc-17-12-20-subm.pdf
doi:10.1016/j.jmarsys.2021.103609
op_rights info:eu-repo/semantics/OpenAccess
op_doi https://doi.org/10.1016/j.jmarsys.2021.103609
container_title Journal of Marine Systems
container_volume 222
container_start_page 103609
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spelling ftccsdartic:oai:HAL:hal-03450616v1 2023-05-15T17:02:05+02:00 Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes Leblanc, Karine Augustin, Lafond Cornet, Veronique Legras, Justine Barbara, Marie Quéguiner, Bernard Lafond, Karine Marie, Barbara Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) Laboratoire d'Océanographie Microbienne (LOMIC) Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2021 https://hal.archives-ouvertes.fr/hal-03450616 https://hal.archives-ouvertes.fr/hal-03450616/document https://hal.archives-ouvertes.fr/hal-03450616/file/Leblanc-17-12-20-subm.pdf https://doi.org/10.1016/j.jmarsys.2021.103609 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103609 hal-03450616 https://hal.archives-ouvertes.fr/hal-03450616 https://hal.archives-ouvertes.fr/hal-03450616/document https://hal.archives-ouvertes.fr/hal-03450616/file/Leblanc-17-12-20-subm.pdf doi:10.1016/j.jmarsys.2021.103609 info:eu-repo/semantics/OpenAccess ISSN: 0924-7963 Journal of Marine Systems https://hal.archives-ouvertes.fr/hal-03450616 Journal of Marine Systems, Elsevier, 2021, 222, pp.103609. ⟨10.1016/j.jmarsys.2021.103609⟩ Diversit y Deep particle stocks Southern Ocean Mortality modes Diatoms Biological carbon pump diversity deep particle stocks [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1016/j.jmarsys.2021.103609 2022-01-08T23:49:58Z International audience Particles located at the interface between the surface ocean layer and the top of the mesopelagic domain are the initial vector of the biological pump yet, their nature is still largely unknown. During the MOBYDICK cruise in the vicinity of the Kerguelen Islands (Indian sector of the Southern Ocean) we deployed a recently available device that concentrates and collects deep particles over a predetermined layer of water. In this paper, we present a detailed description of the collected particles and individual planktonic cells, including their taxonomy, carbon and lipid content, as well as cell viability, in order to characterize the particle stocks present at depth. The cruise was carried out at the end of the summer bloom, a period characterized by declining stocks of biogenic material associated with various mortality processes of planktonic organisms. Unexpectedly, the majority of the collected particles consisted of single empty diatom frustules, while fecal pellets and aggregates accounted for only a minor fraction. Distinct mortality processes, from parasitic infection to mesozooplankton grazing, and distinct silicification degrees as well as different life stages could be identified in relation to diatom taxa suggesting the occurrence of several export modes to intermediate and deep layers within the diatom community. We observed a dominant contribution of single cell diatoms (93 ± 6%) to the deep particle stocks but a very small contribution of intact diatom cells (~0.3%) to C content in the intermediate layer (1-00 m), together with a very small fecal pellet contribution, that was dominated by the minipellet size-class. Taxonomical analyses revealed distinct communities west of Kerguelen in the NLC area compared to the island s fertilized plateau and its eastern ank. Differences in silicification degrees as well as distinct mortality export processes linked to surface nutrient depletion and trophic interactions (such as parasitic infection or grazing by phaeodarians) were ... Article in Journal/Newspaper Kerguelen Islands Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Indian Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 222 103609