Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean
Microplankton community structure and particulate matter stoichiometry were investigated in a late summer survey across the Subantarctic and Polar Front in the Indian sector of the Southern Ocean. Microplankton community structure exerted a first order control on PON:POP stoichiometry with diatom-do...
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ftarchimer:oai:archimer.ifremer.fr:43484 2023-05-15T13:50:50+02:00 Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean Rembauville, M. Blain, S. Caparros, J. Salter, I. 2016-07 application/pdf https://archimer.ifremer.fr/doc/00324/43484/42942.pdf https://archimer.ifremer.fr/doc/00324/43484/42943.docx https://doi.org/10.1002/lno.10291 https://archimer.ifremer.fr/doc/00324/43484/ eng eng Wiley-blackwell info:eu-repo/grantAgreement/EC/FP7/264879/EU//CARBOCHANGE https://archimer.ifremer.fr/doc/00324/43484/42942.pdf https://archimer.ifremer.fr/doc/00324/43484/42943.docx doi:10.1002/lno.10291 https://archimer.ifremer.fr/doc/00324/43484/ 2016 Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/openAccess restricted use Limnology And Oceanography (0024-3590) (Wiley-blackwell), 2016-07 , Vol. 61 , N. 4 , P. 1301-1321 text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1002/lno.10291 2021-09-23T20:27:54Z Microplankton community structure and particulate matter stoichiometry were investigated in a late summer survey across the Subantarctic and Polar Front in the Indian sector of the Southern Ocean. Microplankton community structure exerted a first order control on PON:POP stoichiometry with diatom-dominated samples exhibiting much lower ratios (4–6) than dinoflagellate and ciliate-dominated samples (10–21). A significant fraction of the total chlorophyll a (30–70%) was located beneath the euphotic zone and mixed layer and sub-surface chlorophyll features were associated to transition layers. Although microplankton community structure and biomass was similar between mixed and transition layers, the latter was characterized by elevated Chl:POC ratios indicating photoacclimation of mixed layer communities. Empty diatom frustules, in particular of Fragilariopsis kerguelensis and Pseudo-nitzschia, were found to accumulate in the Antarctic Zone transition layer and were associated to elevated BSi:POC ratios. Furthermore, high Si(OH)4 diffusive fluxes (>1 mmol m2 d−1) into the transition layer appeared likely to sustain silicification. We suggest transition layers as key areas of C and Si decoupling through (1) physiological constraints on carbon and silicon fixation (2) as active foraging sites for grazers that preferentially remineralize carbon. On the Kerguelen Plateau, the dominant contribution of Chaetoceros Hyalochaete resting spores to microplankton biomass resulted in a three-fold enhancement of POC concentration at 250 m, compared to other stations. These findings further highlight the importance of diatom resting spores as a significant vector of carbon export through the intense remineralization horizons characteristing Southern Ocean ecosystems. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian Kerguelen Southern Ocean The Antarctic Limnology and Oceanography 61 4 1301 1321 |
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 |
description |
Microplankton community structure and particulate matter stoichiometry were investigated in a late summer survey across the Subantarctic and Polar Front in the Indian sector of the Southern Ocean. Microplankton community structure exerted a first order control on PON:POP stoichiometry with diatom-dominated samples exhibiting much lower ratios (4–6) than dinoflagellate and ciliate-dominated samples (10–21). A significant fraction of the total chlorophyll a (30–70%) was located beneath the euphotic zone and mixed layer and sub-surface chlorophyll features were associated to transition layers. Although microplankton community structure and biomass was similar between mixed and transition layers, the latter was characterized by elevated Chl:POC ratios indicating photoacclimation of mixed layer communities. Empty diatom frustules, in particular of Fragilariopsis kerguelensis and Pseudo-nitzschia, were found to accumulate in the Antarctic Zone transition layer and were associated to elevated BSi:POC ratios. Furthermore, high Si(OH)4 diffusive fluxes (>1 mmol m2 d−1) into the transition layer appeared likely to sustain silicification. We suggest transition layers as key areas of C and Si decoupling through (1) physiological constraints on carbon and silicon fixation (2) as active foraging sites for grazers that preferentially remineralize carbon. On the Kerguelen Plateau, the dominant contribution of Chaetoceros Hyalochaete resting spores to microplankton biomass resulted in a three-fold enhancement of POC concentration at 250 m, compared to other stations. These findings further highlight the importance of diatom resting spores as a significant vector of carbon export through the intense remineralization horizons characteristing Southern Ocean ecosystems. |
format |
Article in Journal/Newspaper |
author |
Rembauville, M. Blain, S. Caparros, J. Salter, I. |
spellingShingle |
Rembauville, M. Blain, S. Caparros, J. Salter, I. Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
author_facet |
Rembauville, M. Blain, S. Caparros, J. Salter, I. |
author_sort |
Rembauville, M. |
title |
Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
title_short |
Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
title_full |
Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
title_fullStr |
Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
title_full_unstemmed |
Particulate matter stoichiometry driven by microplankton community structure in summer in the Indian sector of the Southern Ocean |
title_sort |
particulate matter stoichiometry driven by microplankton community structure in summer in the indian sector of the southern ocean |
publisher |
Wiley-blackwell |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00324/43484/42942.pdf https://archimer.ifremer.fr/doc/00324/43484/42943.docx https://doi.org/10.1002/lno.10291 https://archimer.ifremer.fr/doc/00324/43484/ |
geographic |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Limnology And Oceanography (0024-3590) (Wiley-blackwell), 2016-07 , Vol. 61 , N. 4 , P. 1301-1321 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/264879/EU//CARBOCHANGE https://archimer.ifremer.fr/doc/00324/43484/42942.pdf https://archimer.ifremer.fr/doc/00324/43484/42943.docx doi:10.1002/lno.10291 https://archimer.ifremer.fr/doc/00324/43484/ |
op_rights |
2016 Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/lno.10291 |
container_title |
Limnology and Oceanography |
container_volume |
61 |
container_issue |
4 |
container_start_page |
1301 |
op_container_end_page |
1321 |
_version_ |
1766254152813379584 |