Fishery College, Zhejiang Ocean University, Zhoushan 316022, China.
National Marine Environmental Monitoring Center, State Oceanic Administration, Dalian 116023, China.
Sci Total Environ. 2021 Mar 25;762:143139. doi: 10.1016/j.scitotenv.2020.143139. Epub 2020 Oct 16.
The Swan Lagoon is a national nature reserve and an important spawning ground in China. In this study, we evaluated the concentration of heavy metals (Cd, Cr, Cu, Pb, and Zn) in different aquatic organisms (aquatic plants, crustaceans, mollusks, and fish), in order to examine their trophic transfer in food web. The results showed that the concentrations of Cd, Cu, Pb, and Zn were considerably higher in mollusks, whereas Cr concentrations were significantly higher in aquatic plants than in mollusks, crustaceans, and fish (p < 0.01). Heavy metals exhibit different patterns of trophic transfer in food web. Cd, Cr, Cu, and Pb tended to be efficiently biodiluted with increasing trophic levels in food web (trophic magnification factor, TMF < 1; p < 0.05). The concentration of Zn increased with increasing trophic level; however, it exhibited a TMF of only 1.03, and was not significantly correlated with δN (p > 0.05), indicating neither biomagnification or biodilution in the food web.
斯旺泻湖是中国的一个国家级自然保护区和重要的产卵场。在这项研究中，我们评估了不同水生生物（水生植物、甲壳类动物、软体动物和鱼类）中重金属（Cd、Cr、Cu、Pb 和 Zn）的浓度，以研究它们在食物网中的营养转移。结果表明，Cd、Cu、Pb 和 Zn 的浓度在软体动物中相当高，而 Cr 的浓度在水生植物中明显高于软体动物、甲壳类动物和鱼类（p<0.01）。重金属在食物网中的营养转移呈现不同的模式。Cd、Cr、Cu 和 Pb 随着食物网营养水平的增加而呈现出有效的生物稀释效应（营养放大因子，TMF<1；p<0.05）。Zn 的浓度随着营养水平的增加而增加；然而，它的 TMF 仅为 1.03，并且与 δN 没有显著相关性（p>0.05），表明在食物网中既没有生物放大也没有生物稀释。
