Modification of Ca isotope and trace metal composition of the major matrices involved in shell formation of Mytilus edulis

Heinemann, Agnes, Fietzke, Jan, Eisenhauer, Anton and Zumholz, Karsten (2008) Modification of Ca isotope and trace metal composition of the major matrices involved in shell formation of Mytilus edulis Geochemistry Geophysics Geosystems, 9 (Q01006). DOI 10.1029/2007GC001777.

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In this study we present the first combined investigation into the composition of the major matrices
involved in calcification processes (surrounding water, extrapallial fluid, aragonite, and calcite) of Mytilus
edulis with respect to their calcium isotope (d44/40Ca) and elemental compositions (Sr/Ca and Mg/Ca). Our
aim was to examine the suitability of Mytilus edulis as a proxy archive and to contribute to the
understanding of the process of biomineralization. Mytilus edulis specimens were live collected from the
Schwentine Estuary, Kiel Fjord, and North Sea (Sylt). d44/40Ca was determined by thermal ionization mass
spectrometry (TIMS) accompanied by measurements of Mg/Ca and Sr/Ca using inductively coupled
plasma–optical emission spectroscopy (ICP-OES). The elemental and isotopic compositions of the
investigated matrices showed systematic offsets. The carbonates are strongly depleted in their magnesium
and strontium concentrations and fractionated toward lighter calcium isotope compositions relative to the
surrounding Schwentine Estuary water. The opposite is observed for the extrapallial fluid (EPF). Our
findings extend the results of previous studies reporting a strong biological control and the interaction of
different environmental conditions influencing biomineralization. Future studies should focus on the
temporal development of the interrelation between the different matrices.

Document Type: Article
Keywords: calcium isotopes, trace elements, Mytilus edulis, proxy, biomineralization
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
DOI etc.: 10.1029/2007GC001777
ISSN: 1525-2027
Projects: Future Ocean, CASIOPEIA
Date Deposited: 29 Apr 2009 09:59
Last Modified: 07 Mar 2018 11:21

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