Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years
International audience 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 w...
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Online Access: | https://hal.science/hal-02105540 https://doi.org/10.1017/S095410201600050X |
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ftinsu:oai:HAL:hal-02105540v1 2023-06-18T03:38:18+02:00 Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years Kumar Shukla, Sunil Crosta, Xavier Birbal Sahni Institute of Palaeosciences Environnements et Paléoenvironnements OCéaniques (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) 2017 https://hal.science/hal-02105540 https://doi.org/10.1017/S095410201600050X en eng HAL CCSD Cambridge University Press (CUP) info:eu-repo/semantics/altIdentifier/doi/10.1017/S095410201600050X hal-02105540 https://hal.science/hal-02105540 doi:10.1017/S095410201600050X ISSN: 0954-1020 EISSN: 1365-2079 Antarctic Science https://hal.science/hal-02105540 Antarctic Science, 2017, 29 (2), pp.139-146. ⟨10.1017/S095410201600050X⟩ biometry diatoms nutrient cycling sea surface temperature [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 2017 ftinsu https://doi.org/10.1017/S095410201600050X 2023-06-05T23:55:23Z International audience 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 Institut national des sciences de l'Univers: HAL-INSU Indian Southern Ocean Antarctic Science 29 2 139 146 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
biometry diatoms nutrient cycling sea surface temperature [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 |
biometry diatoms nutrient cycling sea surface temperature [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 Kumar Shukla, Sunil Crosta, Xavier Fragilariopsis kerguelensis size variability from the Indian subtropical Southern Ocean over the last 42 000 years |
topic_facet |
biometry diatoms nutrient cycling sea surface temperature [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 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. |
author2 |
Birbal Sahni Institute of Palaeosciences Environnements et Paléoenvironnements OCéaniques (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) |
format |
Article in Journal/Newspaper |
author |
Kumar Shukla, Sunil Crosta, Xavier |
author_facet |
Kumar Shukla, Sunil Crosta, Xavier |
author_sort |
Kumar Shukla, Sunil |
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 |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-02105540 https://doi.org/10.1017/S095410201600050X |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Antarctic Science Sea ice Southern Ocean |
genre_facet |
Antarctic Science Sea ice Southern Ocean |
op_source |
ISSN: 0954-1020 EISSN: 1365-2079 Antarctic Science https://hal.science/hal-02105540 Antarctic Science, 2017, 29 (2), pp.139-146. ⟨10.1017/S095410201600050X⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/S095410201600050X hal-02105540 https://hal.science/hal-02105540 doi:10.1017/S095410201600050X |
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 |
_version_ |
1769003283163119616 |