Toxicological effects benzotriazole to the marine scallop Chlamys nobilis: a 2-month exposure study
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Benzotriazole and its associated derivatives (BTs) are widely used as ultraviolet stabilizers and corrosion inhibitors. They have been extensively found in marine environments and are bioaccumulative through the food chain. However, the toxicities of BTs to marine organisms are seldom identified and no assessment has been conducted for filter-feeding bivalves. In this study, a marine scallop Chlamys nobilis was exposed to 0, 0.01, 0.1, and 1.0 mg/L of BT for 60 days. Effects of BT on endocrine system, cytochrome P450 activity, antioxidant activity, and neural activity of C. nobilis were examined. The results showed that BT exerted significant estrogenic effects on both male and female scallops and inhibited EROD activities of C. nobilis even at 0.01 mg/L level. BT at ≥ 0.01 mg/L levels also caused significant oxidative stress on C. nobilis. Moreover, most of the adverse effects of BT to C. nobilis were found from day 35 and 0.01 mg/L was the lowest concentration with observed effects, showing the long-term toxic effects of BT to C. nobilis. Thus, the adverse effects of BT and its derivatives to marine benthic communities deserve more attention in future research.
KeywordsBenzotriazole Chlamys nobilis Vitellogenin EROD Oxidative stress
The help of Yuelin Li in scallop collection and laboratory work are greatly appreciated. Dr. Ping Li, Cui Guo, Diwen Wang, Huibin Cao, Huihui Liu, and Tong Chen from Shantou University also provided invaluable assistance and guidance to this study.
This work was supported by grants from the Marine Public Welfare Project of China (no. 201005012) and 211 Project of Guangdong Province (no. 20091686).
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