Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions
International audience I here present a biometric investigation on two diatom species, Fragilariopsis kerguelensis (O’Meara) Hustedt and Fragilariopsis curta (Van Heurck) Hustedt, in Holocene samples from sediment core MD03-2601 from the Antarctic Continental Shelf off Adélie Land, East Antarctica....
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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ftccsdartic:oai:HAL:hal-02105665v1 2023-05-15T14:03:01+02:00 Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions Crosta, Xavier Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) 2009 https://hal.archives-ouvertes.fr/hal-02105665 https://doi.org/10.1016/j.dsr.2009.06.009 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2009.06.009 hal-02105665 https://hal.archives-ouvertes.fr/hal-02105665 doi:10.1016/j.dsr.2009.06.009 ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-02105665 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 2009, 56 (11), pp.1983-1993. ⟨10.1016/j.dsr.2009.06.009⟩ Diatoms Cell cycle Productivity Sea ice 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 2009 ftccsdartic https://doi.org/10.1016/j.dsr.2009.06.009 2021-11-21T01:31:59Z International audience I here present a biometric investigation on two diatom species, Fragilariopsis kerguelensis (O’Meara) Hustedt and Fragilariopsis curta (Van Heurck) Hustedt, in Holocene samples from sediment core MD03-2601 from the Antarctic Continental Shelf off Adélie Land, East Antarctica. Apical valve length measurements of the two species are compared to their respective absolute and relative abundances as a proxy for the species productivity. Fragilariopsis kerguelensis valves were longer and more abundant during the warmer Mid-Holocene period and smaller and less abundant during the colder Late-Holocene period. Conversely, F. curta valves were smaller and less abundant during the warmer Mid-Holocene period and longer and more abundant during the colder Late-Holocene period. Mean apical valve length variations even follow centennial-to-millennial oscillations in the species abundances. Maximal valve length and minimal valve length were also larger during the warmer Mid-Holocene period and during the colder Late-Holocene period for F. keguelensis and F. curta, respectively. The observed positive size-abundance relationships are linked to the environmental conditions at the core location that stands today at the lower ecological limit for F. kerguelensis and upper ecological limit for F. curta. More favourable environmental conditions (warmer, less icy for F. kerguelensis and colder, icier for F. curta) allowed for sexual reproduction at the upper range of the sexually inducible size window and subsequent restoration of larger initial cells which, in turn, resulted in overall bigger size of the species populations, though vegetative multiplication was more frequent. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic East Antarctica Deep Sea Research Part I: Oceanographic Research Papers 56 11 1983 1993 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Diatoms Cell cycle Productivity Sea ice 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 |
Diatoms Cell cycle Productivity Sea ice 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 Crosta, Xavier Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
topic_facet |
Diatoms Cell cycle Productivity Sea ice 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 I here present a biometric investigation on two diatom species, Fragilariopsis kerguelensis (O’Meara) Hustedt and Fragilariopsis curta (Van Heurck) Hustedt, in Holocene samples from sediment core MD03-2601 from the Antarctic Continental Shelf off Adélie Land, East Antarctica. Apical valve length measurements of the two species are compared to their respective absolute and relative abundances as a proxy for the species productivity. Fragilariopsis kerguelensis valves were longer and more abundant during the warmer Mid-Holocene period and smaller and less abundant during the colder Late-Holocene period. Conversely, F. curta valves were smaller and less abundant during the warmer Mid-Holocene period and longer and more abundant during the colder Late-Holocene period. Mean apical valve length variations even follow centennial-to-millennial oscillations in the species abundances. Maximal valve length and minimal valve length were also larger during the warmer Mid-Holocene period and during the colder Late-Holocene period for F. keguelensis and F. curta, respectively. The observed positive size-abundance relationships are linked to the environmental conditions at the core location that stands today at the lower ecological limit for F. kerguelensis and upper ecological limit for F. curta. More favourable environmental conditions (warmer, less icy for F. kerguelensis and colder, icier for F. curta) allowed for sexual reproduction at the upper range of the sexually inducible size window and subsequent restoration of larger initial cells which, in turn, resulted in overall bigger size of the species populations, though vegetative multiplication was more frequent. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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 |
Crosta, Xavier |
author_facet |
Crosta, Xavier |
author_sort |
Crosta, Xavier |
title |
Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
title_short |
Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
title_full |
Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
title_fullStr |
Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
title_full_unstemmed |
Holocene size variations in two diatom species off East Antarctica: Productivity vs environmental conditions |
title_sort |
holocene size variations in two diatom species off east antarctica: productivity vs environmental conditions |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-02105665 https://doi.org/10.1016/j.dsr.2009.06.009 |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.archives-ouvertes.fr/hal-02105665 Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 2009, 56 (11), pp.1983-1993. ⟨10.1016/j.dsr.2009.06.009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2009.06.009 hal-02105665 https://hal.archives-ouvertes.fr/hal-02105665 doi:10.1016/j.dsr.2009.06.009 |
op_doi |
https://doi.org/10.1016/j.dsr.2009.06.009 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
56 |
container_issue |
11 |
container_start_page |
1983 |
op_container_end_page |
1993 |
_version_ |
1766273474552135680 |