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| Selenium Bioaccumulation and Its Influence on Antioxidant System in Corbicula fluminea |
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| KeyWord:selenium; Corbicula fluminea; bioaccumulation; oxidative stress |
| Author Name | Affiliation | | WANG Wen-na | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China | | WANG Pei-fang | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China | | CHANG Hong | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China | | YIN Ya-yun | Jiangsu Water Conservancy Planning Bureau, Nanjing 210029, China | | WANG Yong-quan | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China | | ZHANG Wei-min | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China |
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| Abstract: |
| Corbicula fluminea has showed potential to be a bio-indicator of sediment pollution. A laboratory experiment was undertaken to investigate the bioaccumulation of selenium（Se） and its influence on antioxidant system and peroxidation product in the visceral mass of C. fluminea under exposure of 14 days. Sediments, obtained from Lake Taihu, were spiked with sodium selenite. The bioaccumulation of Se in C. fluminea was linearly related to Se concentrations in the sediments. The bio-concentration factor（BCF） had a power function relationship with Se concentrations. The color of the visceral mass of C. fluminea gradually became blackened with increasing Se concentrations. The activities of catalase（CAT）, glutathione peroxidase（GPx） and superoxide dismutase（SOD） showed “increase and then decrease” pattern as Se concentrations increased. GPx and CAT were more sensitive to Se contamination than SOD. The maximum activities of CAT and GPx were observed both at 0.609 mg·kg-1 of Se exposure concentration, being 2.84 times and 4.82 times of the control. SOD activity was greatest at 1.638 mg Se·kg-1, which was 2.87 times of the control. The contents of MDA didn′t show consistent responses to Se concentrations. These results indicate that C. fluminea could be used as an indicator of Se pollution in water sediments. |
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