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Effects of cadmium and Aroclor 1254 on antioxidant enzyme activities and lipid peroxidation levels in Mytilus coruscus.

PENG Ling1, ZENG Jiang-ning1,2**, HUANG Wei1, CHEN Quan-zhen1, LIU Jing-jing1   

  1. (1The Second Institute of Oceanography, SOA, Key Laboratory of Marine Ecosystem and Biogeochemistry of SOA, Hangzhou 310012, China; 2 Ocean College, Zhejiang University, Hangzhou 310058, China)
  • Online:2015-03-10 Published:2015-03-10

Abstract: The effects of antioxidant enzymes on the digestive diverticula of Mytilus coruscus were studied at different concentrations of cadmium (0.194, 0.388 and 0.775 mg·L-1) and Aroclor 1254 (0.005, 0.01 and 0.05 mg·L-1) under single and combined stress conditions. The results are as follows: (1) Superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSHPx) activities changed similarly, being first increased and then inhibited under single and combined stress conditions. The highest dose groups (0.775 mg·L-1 of Cd2+, 0.05 mg·L-1 of Aroclor 1254) reached the peak values of antioxidant defense systems earlier on the first day of single stress. The descending range and rate of antioxidant enzymes activities were positively correlated with the stress time and concentration of stress material. (2) The stress sensitivities of SOD and GSH-Px were higher than that of CAT. (3) The content of malonaldehyde (MDA) of each dose group was significantly increased (P<0.01) as the stress time was prolonged. A positive correlation was found between effect of single stress and stress dose or time. (4) The effect of combined stress was stronger than that of single stress. It could be inferred that oxidative stress in M. coruscus would be produced by exposure to cadmium and polychlorinated biphenyl above ambient levels. The antioxidant defense systems could act as biomarkers to monitor marine multiple contamination of heavy metals and organics.

Key words: boreal forest, human-caused fire, spatial point pattern analysis, climate change, Great Xing’an Mountains