在这项研究中,我们收集了56种渔业生物(包括鱼类,甲壳类动物,头足类动物,腹足类,和双壳类)来自达琛渔场的四次季节性调查航行。我们测量了七种重金属(Cd,Zn,Cu,Pb,Cr,As,和汞)在这些渔业生物中。我们使用碳和氮稳定同位素技术确定了它们的营养水平。我们分析了重金属在食物链中的转移特征。结果表明,不同物种之间的重金属浓度存在显着差异。在所有生物群体中,双壳类动物和腹足类动物的重金属富集水平高于其他生物组,而鱼类的重金属富集水平最低。重金属在食物链中表现出不同的营养转移模式。虽然汞在食物链中显示出生物放大现象,这并不重要。Cd,Zn,Cu,Pb,Cr,并且随着营养水平的增加,表现出生物稀释的趋势,除了As,与δ15N无显著相关性。
In this
study, we collected 56 species of fishery organisms (including fish, crustaceans, cephalopods, gastropods, and bivalves) from four seasonal survey cruises at the Dachen fishery grounds. We measured the concentrations of seven heavy metals (Cd, Zn, Cu, Pb, Cr, As, and Hg) in these fisheries organisms. We determined their trophic levels using carbon and nitrogen stable isotope techniques. We analyzed the characteristics of heavy metal transfer in the food chain. The results showed significant differences in heavy metal concentrations among different species. Among all biological groups, bivalves and gastropods exhibited higher levels of heavy metal enrichment than other biological groups, while fish had the lowest levels of heavy metal enrichment. Heavy metals exhibited different patterns of nutritional transfer in the food chain. While Hg showed a biomagnification phenomenon in the food chain, it was not significant. Cd, Zn, Cu, Pb, Cr, and As exhibited a trend of biodilution with increasing nutritional levels, except for As, which showed no significant correlation with δ15N.