Integrated assessment of biomarker responses in ca

Authors: Zaosheng Wang Changzhou Yan Yijun Yan Qiaoqiao Chi

Publish Date: 2012/01/11

Volume: 21, Issue: 3, Pages: 869-881

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Abstract

The marine shrimp Litopenaeus vannamei were used as an active biomonitoring organism to assess the bioavailability and impact of metal contaminants in seven study sites along the Maluan Bay of China Metal concentrations in the hepatopancreas of shrimps were determined in conjunction with four biomarkers responses after a 7 day in situ cage exposures The results showed that contaminant tissue burdens at the deployment sites were greater than those of the reference site and antioxidant enzyme activities were strongly inhibited compared to those of reference organisms Variations in these biomarker responses were correlated significantly p  005 or p  001 with the specific metal pollutants at the study sites but no significant correlations existed between catalase activity responses and the metal contaminants This suggests the presence of undetermined contaminants or other exposure routes that may be responsible for the decreased catalase activity Multivariate analysis revealed a causal relationship between contaminants at each deployment site and the biochemical “response” of the caged shrimps at these sites and demonstrated the presence of two contaminant “hot” spots This investigation suggested that the incorporation of chemical data on trace metal concentrations with the analysis of antioxidant enzymatic activities in caged shrimps can be a useful tool for the identification of causal toxic contaminants in complex mixturesThis work is financially supported by the project of NSFC National Scientific Foundation of China in “Research of ecotoxicity effects and assessment methods based on in situ tests” Grant No 20807034/B070704 to Zaosheng Wang Dr Zaosheng Wang was also supported by the KC Wong Education Foundation Hong Kong The authors would be very grateful for the help by Dr Yue Lin in the fishery research institute of Xiamen who provided sufficient quantities of shrimps for field experiments The manuscript benefited greatly from the helpful comments of three anonymous reviewers

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