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...
Published in: | Journal of Marine Systems |
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Main Authors: | , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Online Access: | https://hal.science/hal-03450616 https://hal.science/hal-03450616/document https://hal.science/hal-03450616/file/Leblanc-17-12-20-subm.pdf https://doi.org/10.1016/j.jmarsys.2021.103609 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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 Lafond, Augustin Cornet, Veronique Legras, Justine Barbara, Marie Quéguiner, B. 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)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) 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) 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 |
Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Barbara, Marie Quéguiner, B. Lafond, Karine Marie, Barbara |
author_facet |
Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Barbara, Marie Quéguiner, B. 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.science/hal-03450616 https://hal.science/hal-03450616/document https://hal.science/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.science/hal-03450616 Journal of Marine Systems, 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.science/hal-03450616 https://hal.science/hal-03450616/document https://hal.science/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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1798848923504214016 |
spelling |
ftsorbonneuniv:oai:HAL:hal-03450616v1 2024-05-12T08:06:25+00:00 Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Barbara, Marie Quéguiner, B. 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)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) 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) ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) 2021 https://hal.science/hal-03450616 https://hal.science/hal-03450616/document https://hal.science/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.science/hal-03450616 https://hal.science/hal-03450616/document https://hal.science/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.science/hal-03450616 Journal of Marine Systems, 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 ftsorbonneuniv https://doi.org/10.1016/j.jmarsys.2021.103609 2024-04-18T03:34:39Z 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 HAL Sorbonne Université Indian Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 222 103609 |