Biological and water chemistry controls on Sr/Ca, Ba/Ca, Mg/Ca and δ18^<Op>rofiles in freshwater pearl mussel Hyriopsis sp
Biological and water chemistry controls on Sr/Ca, Ba/Ca, Mg/Ca and δ18^<Op>rofiles in freshwater pearl mussel Hyriopsis sp
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淡水珍珠贻贝 Hyriopsis sp 中 Sr/Ca、Ba/Ca、Mg/Ca 和 δ18^<Op>谱的生物和水化学控制
DOI：
10.1016/j.palaeo.2011.06.014
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H
中科院分区：
文献类型：
--
作者：
Izumida;H.;Yoshimura;T.;Suzuki;A.;Nakashima;R.;Ishimura;T.;Yasuhara;M.;Inamura;A.;Shikazono;N.;Kawahata;H
研究了淡水养殖珍珠蚌（Hyriopsis sp.，蚌科）和环境水。壳层氧同位素比值沿最大生长轴沿着的一级波动记录了2002 - 2007年贻贝的年生长量。明确的年度Sr/Ca循环表明，Sr被纳入到一个高速率的壳在温暖的季节。所有三个检查的贝壳显示出明显的减少，年平均Sr/Ca的年龄。年内和年内的趋势表明，锶掺入更高的增长速度更快的时期。环境水体中的Ba浓度和Ba/Ca比值既没有年度周期性，也没有季节性变化趋势。与无机文石沉淀实验的结果相反，Ba/Ca与环境温度呈正相关。此外，Ba/Ca和Sr/Ca比值也呈正相关。这些结果表明，不是热力学平衡分配而是壳生长速率控制了Ba掺入帆蚌壳中。三种贝壳的Mg/Ca曲线表明，复杂的因素控制镁进入贝壳文石。水温和年增长率没有显着影响镁的掺入，和大量的标本间的差异表明，理化因素不施加任何系统控制的Mg/Ca比在帆蚌。相反，壳文石的镁含量可能反映生物污染的有机材料或吸附现象，而不是在晶体沉淀过程中的文石晶格的规定取代。我们的研究结果表明，微量元素的文石双壳类的配置文件可以解释为强大的生物控制的结果，凌驾于环境的影响，微量元素的掺入。
We investigated oxygen isotope and Sr/Ca, Ba/Ca and Mg/Ca ratios in shells of a commercially cultured freshwater pearl mussel (Hyriopsis sp., Unionidae) and ambient water. The first-order fluctuations of oxygen isotope ratios of the outer shell layer along the maximum growth axis recorded the mussels' annual growth from 2002 to 2007. Clear annual Sr/Ca cycles suggest that Sr was incorporated into the shells at a high rate during warm seasons. All three examined shells showed a clear decrease in annual average Sr/Ca with age. Inter- and intra-annual trends suggest that Sr incorporation was higher during periods of faster growth. The Ba concentration and the Ba/Ca ratio of ambient water showed neither an annual periodicity nor a seasonal trend. In contrast to the findings of an inorganic aragonite precipitation experiment, Ba/Ca was positively correlated with ambient temperature. In addition, Ba/Ca and Sr/Ca ratios were positively correlated with each other. These results suggest that not thermodynamic equilibrium partitioning but the shell growth rate controls Ba incorporation into Hyriopsis shells. The Mg/Ca profiles of the three shells suggest that complex factors control the incorporation of Mg into shell aragonite. Water temperature and annual growth rates did not significantly influence Mg incorporation, and substantial interspecimen differences suggested that physicochemical factors do not exert any systematic control on Mg/Ca ratios in Hyriopsis. Instead, the Mg content of shell aragonite might reflect biological contamination with organic material or adsorption phenomena during crystal precipitation rather than regulated substitution into the aragonite crystal lattice. Our results suggest that trace element profiles in aragonitic bivalve shells could be interpreted as the result of strong biological controls over-riding environmental influences on trace element incorporation.