Coccolith strontium to calcium ratios in Emiliania huxleyi: The dependence on seawater strontium and calcium concentrations.

Langer, G., Gussone, Nikolaus, Nehrke, G., Riebesell, Ulf , Eisenhauer, Anton , Rost, B., Trimborn, S. and Thoms, S. (2006) Coccolith strontium to calcium ratios in Emiliania huxleyi: The dependence on seawater strontium and calcium concentrations. Limnology and Oceanography, 51 . pp. 310-320. DOI 10.4319/lo.2006.51.1.0310.

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Abstract

In recent studies the Sr/Ca ratio of coccolithophore calcite was used as a proxy for past coccolithophore growth and calcification rates. Since Sr and Ca concentrations in seawater have not remained constant through time, interpretation of Sr/Ca data from the coccolith-dominated sedimentary record requires knowledge about the incorporation of seawater Sr into coccolith calcite during coccolithogenesis. Here we show that Sr/Ca of Emiliania huxleyi coccoliths is linearly related to seawater Sr/Ca, meaning that the Sr exchange coefficient does not change with changing seawater Sr/Ca. The exchange coefficient for Sr in this study, 0.39, is close to values presented in the literature and is high compared with values obtained by inorganic precipitation experiments. This suggests a strong effect of cell physiology on biogenic calcite precipitation in coccolithophores. We present a conceptual model, based on the transmembrane transport of Sr and Ca, which explains the offset.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.4319/lo.2006.51.1.0310
ISSN: 0024-3590
Projects: CASIOPEIA
Date Deposited: 03 Dec 2008 16:52
Last Modified: 23 Sep 2019 21:13
URI: http://oceanrep.geomar.de/id/eprint/671

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