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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Published in:Marine Micropaleontology
Main Authors: Cubillos, Joana C., Henderiks, Jorijntje, Beaufort, Luc, L, Howard, William R., Hallegraeff, Gustaaf M.
Other Authors: 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
Language:English
Published: HAL CCSD 2012
Subjects:
Online Access:https://hal.science/hal-01458309
https://doi.org/10.1016/j.marmicro.2012.04.005
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spelling ftunivaixmarseil:oai:HAL:hal-01458309v1 2024-04-28T08:39:26+00:00 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 ftunivaixmarseil https://doi.org/10.1016/j.marmicro.2012.04.005 2024-04-04T17:37:38Z 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 Aix-Marseille Université: HAL Marine Micropaleontology 92-93 29 39
institution Open Polar
collection Aix-Marseille Université: HAL
op_collection_id ftunivaixmarseil
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
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
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