Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes
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)...
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Elsevier BV
2021
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Online Access: | https://archimer.ifremer.fr/doc/00704/81648/97811.pdf https://doi.org/10.1016/j.jmarsys.2021.103609 https://archimer.ifremer.fr/doc/00704/81648/ |
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ftarchimer:oai:archimer.ifremer.fr:81648 2023-05-15T17:02:04+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 Lafond, Augustin Cornet, Veronique Legras, Justine Marie, Barbara Queguiner, Bernard 2021-10 application/pdf https://archimer.ifremer.fr/doc/00704/81648/97811.pdf https://doi.org/10.1016/j.jmarsys.2021.103609 https://archimer.ifremer.fr/doc/00704/81648/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00704/81648/97811.pdf doi:10.1016/j.jmarsys.2021.103609 https://archimer.ifremer.fr/doc/00704/81648/ info:eu-repo/semantics/openAccess restricted use Journal Of Marine Systems (0924-7963) (Elsevier BV), 2021-10 , Vol. 222 , P. 103609 (17p.) Biological carbon pump Diatoms Mortality modes Southern Ocean Diversity Deep particle stocks text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1016/j.jmarsys.2021.103609 2022-11-29T23:50:26Z 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 (125–500 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 HNLC area compared to the island's fertilized plateau and its eastern flank. 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 identified in the upper ... Article in Journal/Newspaper Kerguelen Islands Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Kerguelen Kerguelen Islands Southern Ocean Journal of Marine Systems 222 103609 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Biological carbon pump Diatoms Mortality modes Southern Ocean Diversity Deep particle stocks |
spellingShingle |
Biological carbon pump Diatoms Mortality modes Southern Ocean Diversity Deep particle stocks Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Marie, Barbara Queguiner, Bernard Deep particle stocks following the summer bloom around the Kerguelen islands: Insights into diatoms physiological state, community structure and mortality modes |
topic_facet |
Biological carbon pump Diatoms Mortality modes Southern Ocean Diversity Deep particle stocks |
description |
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 (125–500 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 HNLC area compared to the island's fertilized plateau and its eastern flank. 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 identified in the upper ... |
format |
Article in Journal/Newspaper |
author |
Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Marie, Barbara Queguiner, Bernard |
author_facet |
Leblanc, Karine Lafond, Augustin Cornet, Veronique Legras, Justine Marie, Barbara Queguiner, Bernard |
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 |
Elsevier BV |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00704/81648/97811.pdf https://doi.org/10.1016/j.jmarsys.2021.103609 https://archimer.ifremer.fr/doc/00704/81648/ |
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 |
Journal Of Marine Systems (0924-7963) (Elsevier BV), 2021-10 , Vol. 222 , P. 103609 (17p.) |
op_relation |
https://archimer.ifremer.fr/doc/00704/81648/97811.pdf doi:10.1016/j.jmarsys.2021.103609 https://archimer.ifremer.fr/doc/00704/81648/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.jmarsys.2021.103609 |
container_title |
Journal of Marine Systems |
container_volume |
222 |
container_start_page |
103609 |
_version_ |
1766055303495811072 |