Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau
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 thr...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Language: | English |
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Online Access: | https://eprints.utas.edu.au/6655/ https://eprints.utas.edu.au/6655/1/Armand_et_al._DSR_11_2008.sediments.pdf https://doi.org/10.1016/j.dsr2.2007.12.031 |
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ftunivtasmania:oai:eprints.utas.edu.au:6655 2023-05-15T13:36:46+02:00 Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau Armand, LK Crosta, X Quéguiner, B Mosseri, J Garcia, N 2008 application/pdf https://eprints.utas.edu.au/6655/ https://eprints.utas.edu.au/6655/1/Armand_et_al._DSR_11_2008.sediments.pdf https://doi.org/10.1016/j.dsr2.2007.12.031 en eng https://eprints.utas.edu.au/6655/1/Armand_et_al._DSR_11_2008.sediments.pdf Armand, LK, Crosta, X, Quéguiner, B, Mosseri, J and Garcia, N 2008 , 'Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau' , Deep Sea Research Part II: Topical Studies in Oceanography, vol. 55, no. 5-7 , pp. 677-692 , doi:10.1016/j.dsr2.2007.12.031 <http://dx.doi.org/10.1016/j.dsr2.2007.12.031>. cc_utas 270705 Palaeoecology 260401 Biological Oceanography 260499 Oceanography not elsewhere classified 270709 Biogeography Bacillariophyceae Sediments Fluff layer Biogenic silica Chlorophyll a Southern Ocean Article PeerReviewed 2008 ftunivtasmania https://doi.org/10.1016/j.dsr2.2007.12.031 2020-05-30T07:20:29Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Kerguelen Deep Sea Research Part II: Topical Studies in Oceanography 55 5-7 653 676 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
270705 Palaeoecology 260401 Biological Oceanography 260499 Oceanography not elsewhere classified 270709 Biogeography Bacillariophyceae Sediments Fluff layer Biogenic silica Chlorophyll a Southern Ocean |
spellingShingle |
270705 Palaeoecology 260401 Biological Oceanography 260499 Oceanography not elsewhere classified 270709 Biogeography Bacillariophyceae Sediments Fluff layer Biogenic silica Chlorophyll a Southern Ocean Armand, LK Crosta, X Quéguiner, B Mosseri, J Garcia, N Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau |
topic_facet |
270705 Palaeoecology 260401 Biological Oceanography 260499 Oceanography not elsewhere classified 270709 Biogeography Bacillariophyceae Sediments Fluff layer Biogenic silica Chlorophyll a Southern Ocean |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Armand, LK Crosta, X Quéguiner, B Mosseri, J Garcia, N |
author_facet |
Armand, LK Crosta, X Quéguiner, B Mosseri, J Garcia, N |
author_sort |
Armand, LK |
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 |
publishDate |
2008 |
url |
https://eprints.utas.edu.au/6655/ https://eprints.utas.edu.au/6655/1/Armand_et_al._DSR_11_2008.sediments.pdf https://doi.org/10.1016/j.dsr2.2007.12.031 |
geographic |
Antarctic Southern Ocean Kerguelen |
geographic_facet |
Antarctic Southern Ocean Kerguelen |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
op_relation |
https://eprints.utas.edu.au/6655/1/Armand_et_al._DSR_11_2008.sediments.pdf Armand, LK, Crosta, X, Quéguiner, B, Mosseri, J and Garcia, N 2008 , 'Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau' , Deep Sea Research Part II: Topical Studies in Oceanography, vol. 55, no. 5-7 , pp. 677-692 , doi:10.1016/j.dsr2.2007.12.031 <http://dx.doi.org/10.1016/j.dsr2.2007.12.031>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.12.031 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
5-7 |
container_start_page |
653 |
op_container_end_page |
676 |
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1766083814827753472 |