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.

[img]
Preview
Text
0310.pdf - Published Version

Download (287Kb) | Preview

Supplementary data:

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
Refereed: Yes
DOI etc.: 10.4319/lo.2006.51.1.0310
ISSN: 0024-3590
Date Deposited: 03 Dec 2008 16:52
Last Modified: 30 Jan 2014 12:54
URI: http://eprints.uni-kiel.de/id/eprint/671

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...