Modification of Ca isotope and trace metal composition of the major matrices involved in shell formation of Mytilus edulis
Modification of Ca isotope and trace metal composition of the major matrices involved in shell formation of Mytilus edulis
复制标题
贻贝壳形成主要基质的钙同位素和痕量金属组成的修饰
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Zumholz
中科院分区：
文献类型：
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作者：
A. Heinemann;J. Fietzke;A. Eisenhauer;K. Zumholz
本文首次对紫贻贝钙化过程中的主要基质（周围水、外膜液、文石和方解石）的钙同位素（δ44/40 Ca）和元素组成（Sr/Ca和Mg/Ca）进行了综合研究。我们的目的是研究紫贻贝作为代理档案的适用性，并有助于了解生物矿化过程。紫贻贝（Mytilus edulis）是从Schwentine河口、基尔峡湾和北海（Sylt）采集的活体标本。通过热电离质谱法（TIMS）测定δ44/40 Ca，同时使用电感耦合等离子体发射光谱法（ICP-OES）测量Mg/Ca和Sr/Ca。元素和同位素组成的调查矩阵显示系统的偏移。碳酸盐强烈耗尽其镁和锶的浓度和分馏向较轻的钙同位素组成相对于周围的Schwentine河口水。对于外膜液（EPF）观察到相反的情况。我们的研究结果扩展了以前的研究报告，一个强大的生物控制和不同的环境条件影响生物矿化的相互作用的结果。未来的研究应侧重于不同矩阵之间的相互关系的时间发展。
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 (δ44/40Ca) 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). δ44/40Ca 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.