Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato)
International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material f...
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ftinsu:oai:HAL:hal-01458309v1 2023-12-17T10:50:26+01:00 Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc, L Howard, William R. Hallegraeff, Gustaaf M. Paleobiology Program Uppsala University Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2012-09 https://hal.science/hal-01458309 https://doi.org/10.1016/j.marmicro.2012.04.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marmicro.2012.04.005 hal-01458309 https://hal.science/hal-01458309 doi:10.1016/j.marmicro.2012.04.005 ISSN: 0377-8398 Marine Micropaleontology https://hal.science/hal-01458309 Marine Micropaleontology, 2012, 92-93, pp.29-39. ⟨10.1016/j.marmicro.2012.04.005⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1016/j.marmicro.2012.04.005 2023-11-22T17:49:27Z International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material from the South Tasman Rise region of the Southern Ocean was used for calibration and validation. Our approach was tested with only the coccolith central area (CA) considered for measurement, to avoid relying on the less robust proximal shields. Thus our results are relative and intend to quantify intra-specific variations in volumetric calcite weight, expressed as a Weight Index (WI). Our results were overall consistent with mass estimation based on distal shield lengths. However, the WI approach clearly has the advantage in exploring allometric scaling between coccolith size and weight, as well as in measuring the degree of calcification in similarly sized morphotypes. Combining WI and morphometry data (distal shield length, DSL), we demonstrate subtle, but statistically significant changes in shape and thus calcification degree both within and between the tested Coccolithus populations. Most strikingly, it appears that modern Coccolithus populations in the Southern Ocean are, on average, more heavily calcified than their fossil counterparts. (c) 2012 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU South Tasman Rise ENVELOPE(148.000,148.000,-47.500,-47.500) Southern Ocean Marine Micropaleontology 92-93 29 39 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc, L Howard, William R. Hallegraeff, Gustaaf M. Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material from the South Tasman Rise region of the Southern Ocean was used for calibration and validation. Our approach was tested with only the coccolith central area (CA) considered for measurement, to avoid relying on the less robust proximal shields. Thus our results are relative and intend to quantify intra-specific variations in volumetric calcite weight, expressed as a Weight Index (WI). Our results were overall consistent with mass estimation based on distal shield lengths. However, the WI approach clearly has the advantage in exploring allometric scaling between coccolith size and weight, as well as in measuring the degree of calcification in similarly sized morphotypes. Combining WI and morphometry data (distal shield length, DSL), we demonstrate subtle, but statistically significant changes in shape and thus calcification degree both within and between the tested Coccolithus populations. Most strikingly, it appears that modern Coccolithus populations in the Southern Ocean are, on average, more heavily calcified than their fossil counterparts. (c) 2012 Elsevier B.V. All rights reserved. |
author2 |
Paleobiology Program Uppsala University Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc, L Howard, William R. Hallegraeff, Gustaaf M. |
author_facet |
Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc, L Howard, William R. Hallegraeff, Gustaaf M. |
author_sort |
Cubillos, Joana C. |
title |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_short |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_full |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_fullStr |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_full_unstemmed |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_sort |
reconstructing calcification in ancient coccolithophores: individual coccolith weight and morphology of coccolithus pelagicus (sensu lato) |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-01458309 https://doi.org/10.1016/j.marmicro.2012.04.005 |
long_lat |
ENVELOPE(148.000,148.000,-47.500,-47.500) |
geographic |
South Tasman Rise Southern Ocean |
geographic_facet |
South Tasman Rise Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0377-8398 Marine Micropaleontology https://hal.science/hal-01458309 Marine Micropaleontology, 2012, 92-93, pp.29-39. ⟨10.1016/j.marmicro.2012.04.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marmicro.2012.04.005 hal-01458309 https://hal.science/hal-01458309 doi:10.1016/j.marmicro.2012.04.005 |
op_doi |
https://doi.org/10.1016/j.marmicro.2012.04.005 |
container_title |
Marine Micropaleontology |
container_volume |
92-93 |
container_start_page |
29 |
op_container_end_page |
39 |
_version_ |
1785575251543851008 |