High resolution distribution of trace elements in the calcite shell layer of modern mytilus edulis: environmental and biological controls
High resolution distribution of trace elements in the calcite shell layer of modern mytilus edulis: environmental and biological controls
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DOI：
10.1016/s0016-7037(99)00380-4
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发表时间：
2000-03
影响因子：
5
通讯作者：
E. V. Putten;F. Dehairs;E. Keppens;W. Baeyens
中科院分区：
文献类型：
--
作者：
E. V. Putten;F. Dehairs;E. Keppens;W. Baeyens
用激光烧蚀-电感耦合等离子体质谱测定方解石壳层中镁、锰、锶、钡和铅的高分辨率分布，并与环境参数的时间变化进行了比较。所有元素都表现出年周期的周期性变化。镁、锶和铅的循环具有很大的相似性，在春季和初夏具有广泛的极大值特征。这些剖面不能用海水成分的季节性变化来解释。在春季，骨骼镁随温度的变化是可重复的，但这种协变在春季浮游植物开花后突然中断。由于缺乏全年恒定的镁-温度关系，阻碍了镁在蓝藻方解石中作为高分辨率温度替代物的直接使用。主宰着每个骨骼的BA循环的尖锐峰值与每年藻类生物量的最大值相吻合，并可能反映了与春季浮游植物水华有关的颗粒物BA浓度的升高。同样，春季骨骼锰浓度的升高可能反映了水华诱导的颗粒态锰的增加。骨骼δ13C表现出季节性变化，其特征是最小值与最大值重合。这些δ13C的变化与海水溶解无机碳的δ13C的季节性趋势不平衡，可能反映了代谢碳对贝壳碳酸盐贡献的波动，与贻贝呼吸速率的季节性变化相对应。
Mussels of a similar size, originating from the same population, have been grown in the field and the high resolution distribution of Mg, Mn, Sr, Ba and Pb in their calcite shell layer, as determined by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry, has been compared to temporal variations of environmental parameters. All elements exhibit cyclic variations with an annual periodicity. The Mg, Sr and Pb cycles show great similarity and are characterised by a broad maximum during spring and early summer. These profiles cannot be explained by seasonal variations in the seawater composition. Skeletal Mg covaries reproducibly with temperature during spring but this covariation is abruptly interrupted after the spring phytoplankton bloom. The absence of a constant Mg-temperature relationship over the year hampers the direct use of Mg in M. edulis calcite as a high resolution temperature proxy. The sharp peak that is dominating each skeletal Ba cycle coincides with the annual algal biomass maximum and presumably reflects elevated concentrations of particulate Ba, associated with the spring phytoplankton bloom. Similarly, elevated skeletal Mn concentrations during spring might reflect bloom-induced increases in particulate Mn. Skeletal δ13C shows a seasonal variation, characterised by a minimum that coincides with the Mn maximum. These δ13C variations are not in equilibrium with the seasonal δ13C trend of the seawater dissolved inorganic carbon and presumably reflect fluctuations in the contribution of metabolic carbon to the shell carbonate, corresponding to seasonal variations in the mussel’s respiration rate.