Concentrations and Accumulation Features of Organochlorine Pesticides in the Baiyangdian Lake Freshwater Food Web of North China |
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Authors: | Guocheng Hu Jiayin Dai Bixian Mai Xiaojun Luo Hong Cao Jianshe Wang Fengchao Li Muqi Xu |
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Institution: | (1) Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China;(2) State Key Laboratory of Organic Chemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People’s Republic of China;(3) College of Life Sciences, Hebei University, Baoding, 071002, People’s Republic of China; |
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Abstract: | Organochlorine pesticides (OCPs), such as hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT), are ubiquitous
anthropogenic environmental contaminants. They are persistent, broad-spectrum toxicants that accumulate in the food web with
potential risks to the ecosystem and human health. HCHs were the predominant contaminants in Baiyangdian Lake, North China.
Concentrations of HCHs and DDTs ranged from 58 to 563 ng/g lipid weight (lw) and 21 to 401 ng/g lw, respectively, for aquatic
biota samples. The highest levels of HCHs and DDTs were observed in muscles of yellow catfish. The mean concentrations of
OCPs were 4.6 ng/L for water, 95 ng/g dry weight (dw) for aquatic plants, and 14 ng/g dw for sediments. Among the isomers
and metabolites, α-HCH and p,p′-1,1-di(p-chlorophenyl)-2,2-dichloroethylene (p,p′-DDE) were the predominant congeners in biota samples. Correlations between log lipid-normalized concentrations of HCHs and
DDTs and trophic levels (TLs) based on analysis of stable isotopes of nitrogen confirmed that persistent organic pollutants
were magnified in the Baiyangdian Lake food web. Significant positive relationships were found for α-HCH and p,p′-DDT and their trophic magnification factors, which were 1.6 and 1.7, respectively. These results provide evidence of biomagnification
of persistent organic pollutants (POPs) in freshwater food webs. |
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