Abstract:The effects of commercial cypermethrin on growth and physiochemical parameters of Scenedesmus obliquus were investigated by 72 h growth tests in a batch-culture system. The purpose was to understand influences of commercial pyrethroid insecticides on aquatic ecosystem. The growth of algal cells was inhibited by cypermethrin in a dose-dependent pattern. The 72 h median effect concentration (EC50) was 2.37 mg/L. All biochemical parameters varied significantly within 12 h exposure, and were stable after 24 h exposure. Cellular contents of soluble protein and sugar were enhanced under the stress of cypermethrin, and the maximum magnification occurred at the moderate concentrations. Activity of superoxide dismutase (SOD) was stimulated at low concentrations and inhibited at high concentrations. However, content of f lipid peroxidation (malondialdehyde, MDA) increased significantly with the increasing of concentration, indicating the potential of using MDA as the biomarker for cypermethrin pollution. The results from this study suggest that the inactivation of SOD activity and consequent lipid peroxidation may be crucial toxic mechanism for cypermethrin to algal cell; however background levels of cypermethrin in natural waters will not inhibit the growth of phytoplankton.
王朝晖, 谢骏, 姜珊, 史婧佳, 刘勇斌, 龚望宝. 商品氯氰菊酯对斜生栅藻生长的影响及其生理生化效应[J]. 中国环境科学, 2012, 32(4): 659-665.
WANG Chao-Hui, XIE Jun, JIANG Shan, SHI Jing-Jia, LIU Yong-Bin, GONG Wang-Bao. Effects of commercial cypermethrin on the growth of Scenedesmus obliquus and its physiochemical responses. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(4): 659-665.