Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau
International audience An ''island mass effect'' was observed from the sedimentary distribution of diatoms on the northeastern Kerguelen Plateau. Five new samples placed in context to species distributions previously reported from the Permanently Open Ocean Zone (POOZ) revealed a...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2008
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Online Access: | https://hal.science/hal-02105674 https://doi.org/10.1016/j.dsr2.2007.12.032 |
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ftunivnantes:oai:HAL:hal-02105674v1 |
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openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Fluff layer Sediments Bacillariophyceae Biogenic silica Chlorophyll a Southern Ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Fluff layer Sediments Bacillariophyceae Biogenic silica Chlorophyll a Southern Ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Armand, Leanne Crosta, X. Queguiner, Bernard Mosseri, J. Garcia, N. Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
topic_facet |
Fluff layer Sediments Bacillariophyceae Biogenic silica Chlorophyll a Southern Ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience An ''island mass effect'' was observed from the sedimentary distribution of diatoms on the northeastern Kerguelen Plateau. Five new samples placed in context to species distributions previously reported from the Permanently Open Ocean Zone (POOZ) revealed a plateau community dominated by three species/taxa: Fragilariopsis kerguelensis, Thalassionema nitzschioides f. nitzschioides and Chaetoceros Hyalochaete resting spores. Intermediate abundances of Thalassiosira antarctica were unique to the plateau sediment signature as were increased abundances of Eucampia antarctica v. antarctica. The off-plateau sediment sample contained typical POOZ sediment distributions dominated by F. kerguelensis, Thalassiosira lentiginosa and Thalassiothrix antarctica. The role of deposition from the surface waters to the sediments was investigated by comparison to the diatom thanatocoenose observed in surface waters. These results suggest that the use of sediment abundances of C. Hyalochaete resting spores and F. kerguelensis to determine past productivity events (such as wind-sourced iron enrichment of the Southern Ocean at the Last Glacial Maximum) is not straightforward. The elevated abundance of T. nitzschioides f. nitzschioides on the plateau did not indicate an iron-deplete regime but the converse. For the evaluation of paleo-productivity hypotheses for the open Southern Ocean, we suggest caution in the use of Subantarctic and Kerguelen Plateau sediment signatures, and emphasize that there is a need to also study Antarctic coastal and especially sea-ice melt-water stimulated blooms. r |
author2 |
Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 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 de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM) Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Armand, Leanne Crosta, X. Queguiner, Bernard Mosseri, J. Garcia, N. |
author_facet |
Armand, Leanne Crosta, X. Queguiner, Bernard Mosseri, J. Garcia, N. |
author_sort |
Armand, Leanne |
title |
Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
title_short |
Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
title_full |
Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
title_fullStr |
Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
title_full_unstemmed |
Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
title_sort |
diatoms preserved in surface sediments of the northeastern kerguelen plateau |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-02105674 https://doi.org/10.1016/j.dsr2.2007.12.032 |
geographic |
Antarctic Kerguelen Southern Ocean |
geographic_facet |
Antarctic Kerguelen Southern Ocean |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
op_source |
ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-02105674 Deep Sea Research Part II: Topical Studies in Oceanography, 2008, 55 (5-7), pp.677-692. ⟨10.1016/j.dsr2.2007.12.032⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.12.032 hal-02105674 https://hal.science/hal-02105674 doi:10.1016/j.dsr2.2007.12.032 |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.12.032 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
5-7 |
container_start_page |
677 |
op_container_end_page |
692 |
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1766132350585929728 |
spelling |
ftunivnantes:oai:HAL:hal-02105674v1 2023-05-15T13:40:19+02:00 Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau Armand, Leanne Crosta, X. Queguiner, Bernard Mosseri, J. Garcia, N. Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 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 de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM) Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.science/hal-02105674 https://doi.org/10.1016/j.dsr2.2007.12.032 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.12.032 hal-02105674 https://hal.science/hal-02105674 doi:10.1016/j.dsr2.2007.12.032 ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.science/hal-02105674 Deep Sea Research Part II: Topical Studies in Oceanography, 2008, 55 (5-7), pp.677-692. ⟨10.1016/j.dsr2.2007.12.032⟩ Fluff layer Sediments Bacillariophyceae Biogenic silica Chlorophyll a Southern Ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2008 ftunivnantes https://doi.org/10.1016/j.dsr2.2007.12.032 2023-02-08T07:43:57Z International audience An ''island mass effect'' was observed from the sedimentary distribution of diatoms on the northeastern Kerguelen Plateau. Five new samples placed in context to species distributions previously reported from the Permanently Open Ocean Zone (POOZ) revealed a plateau community dominated by three species/taxa: Fragilariopsis kerguelensis, Thalassionema nitzschioides f. nitzschioides and Chaetoceros Hyalochaete resting spores. Intermediate abundances of Thalassiosira antarctica were unique to the plateau sediment signature as were increased abundances of Eucampia antarctica v. antarctica. The off-plateau sediment sample contained typical POOZ sediment distributions dominated by F. kerguelensis, Thalassiosira lentiginosa and Thalassiothrix antarctica. The role of deposition from the surface waters to the sediments was investigated by comparison to the diatom thanatocoenose observed in surface waters. These results suggest that the use of sediment abundances of C. Hyalochaete resting spores and F. kerguelensis to determine past productivity events (such as wind-sourced iron enrichment of the Southern Ocean at the Last Glacial Maximum) is not straightforward. The elevated abundance of T. nitzschioides f. nitzschioides on the plateau did not indicate an iron-deplete regime but the converse. For the evaluation of paleo-productivity hypotheses for the open Southern Ocean, we suggest caution in the use of Subantarctic and Kerguelen Plateau sediment signatures, and emphasize that there is a need to also study Antarctic coastal and especially sea-ice melt-water stimulated blooms. r Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Kerguelen Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 55 5-7 677 692 |