Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years
Abstract In the open Southern Ocean (SO), both modern and past size changes of the diatom Fragilariopsis kerguelensis appear to be strongly controlled by iron availability. Conversely, sea surface temperatures (SST) and sea ice seasonal dynamics take over in the seasonal sea-ice zone where iron is n...
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Online Access: | http://dx.doi.org/10.1017/s095410201600050x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201600050X |
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crcambridgeupr:10.1017/s095410201600050x 2024-03-03T08:39:29+00:00 Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years Shukla, Sunil Kumar Crosta, Xavier 2016 http://dx.doi.org/10.1017/s095410201600050x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201600050X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 29, issue 2, page 139-146 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2016 crcambridgeupr https://doi.org/10.1017/s095410201600050x 2024-02-08T08:27:37Z Abstract In the open Southern Ocean (SO), both modern and past size changes of the diatom Fragilariopsis kerguelensis appear to be strongly controlled by iron availability. Conversely, sea surface temperatures (SST) and sea ice seasonal dynamics take over in the seasonal sea-ice zone where iron is not limiting. No information exists on F. kerguelensis biometry from the subtropical SO, on the other extreme of the thermal and nutrient gradients. We present here new data on mean valve area of F. kerguelensis (FkergArea) from a sediment core covering the last ~42 cal kyrs from the southern Subtropical Front (SSTF) of the Indian sector of the SO, where iron and silica stocks are thought to have been consistently low over this period. Our results suggest that larger F. kerguelensis valves occurred during the Last Glacial period, and declined during the Holocene period. These findings indicate that more favourable SST, within the F. kerguelensis ecological range, during the Last Glacial period may have enabled F. kerguelensis to make better use of the low silica stocks prevailing in the subtropical zone leading to larger valves. Conversely, declining FkergArea during the deglacial and the Holocene periods may have been a result of higher SST which hampered the utilization of silica. Article in Journal/Newspaper Antarctic Science Sea ice Southern Ocean Cambridge University Press Southern Ocean Indian Antarctic Science 29 2 139 146 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Shukla, Sunil Kumar Crosta, Xavier Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract In the open Southern Ocean (SO), both modern and past size changes of the diatom Fragilariopsis kerguelensis appear to be strongly controlled by iron availability. Conversely, sea surface temperatures (SST) and sea ice seasonal dynamics take over in the seasonal sea-ice zone where iron is not limiting. No information exists on F. kerguelensis biometry from the subtropical SO, on the other extreme of the thermal and nutrient gradients. We present here new data on mean valve area of F. kerguelensis (FkergArea) from a sediment core covering the last ~42 cal kyrs from the southern Subtropical Front (SSTF) of the Indian sector of the SO, where iron and silica stocks are thought to have been consistently low over this period. Our results suggest that larger F. kerguelensis valves occurred during the Last Glacial period, and declined during the Holocene period. These findings indicate that more favourable SST, within the F. kerguelensis ecological range, during the Last Glacial period may have enabled F. kerguelensis to make better use of the low silica stocks prevailing in the subtropical zone leading to larger valves. Conversely, declining FkergArea during the deglacial and the Holocene periods may have been a result of higher SST which hampered the utilization of silica. |
format |
Article in Journal/Newspaper |
author |
Shukla, Sunil Kumar Crosta, Xavier |
author_facet |
Shukla, Sunil Kumar Crosta, Xavier |
author_sort |
Shukla, Sunil Kumar |
title |
Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
title_short |
Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
title_full |
Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
title_fullStr |
Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
title_full_unstemmed |
Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
title_sort |
fragilariopsis kerguelensis size variability from the indian subtropical southern ocean over the last 42 000 years |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/s095410201600050x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201600050X |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Antarctic Science Sea ice Southern Ocean |
genre_facet |
Antarctic Science Sea ice Southern Ocean |
op_source |
Antarctic Science volume 29, issue 2, page 139-146 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410201600050x |
container_title |
Antarctic Science |
container_volume |
29 |
container_issue |
2 |
container_start_page |
139 |
op_container_end_page |
146 |
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1792495061640937472 |