季节变化和个体大小对河蚬积累重金属的影响

Effects of Seasonal Variation and Individual Size on Heavy Metals Accumulation in Corbicula fluminea

以长江河口湿地生态系统一种习见的大型底栖动物河蚬 Corbicula fluminea 为研究对象，分析了季节变化和个体大小对河蚬积累 Zn, Cu, Pb, Cd 和 Cr 的影响。结果表明，季节变化对河蚬积累重金属没有显著的影响，春季和秋季河蚬体内的重金属含量较为接近。河蚬体内 Cu 的积累量在不同大小个体间存在着显著的差异，大个体体内的 Cu 含量明显高于小个体，但 Zn, Cd, Cr 和 Pb 的含量在不同大小个体间的差异不显著。总体上看，季节变化和个体大小对河蚬积累重金属的影响均不是很显著。

We have selected a kind of bivalves, Corbicula fluminea, which commonly distributes in the tidal flats of Changjiang estuary, as the study material in this research work, and analyzed the effects of seasonal variation and individual size on Zn, Cu, Pb, Cd and Cr accumulation in that kind of bivalve. The results show that the seasonal variation doesn't significantly affect the animals' accumulation for heavy metals, and the metal contents in Corbicula fluminea collected respectively in spring and autumn are similar. As to the individual size, there is a significant difference in Cu content accumulated by Corbicula fluminea of different sizes, with larger individuals having markedly higher Cu content than smaller ones, but no significant difference is found in Zn, Cd, Cr and Pb contents in the bivalves of different sizes. In general, both the effects of seasonal variation and individual size on metals accumulation in Corbicula fluminea are not very significant.