Ecotoxicological effects and mechanism of algae on Daphnia Magna's resistance to pesticides
HE Yan1, SHI Wan-qi1, PENG Xing-xing1, YANG Wei1, LI Zhe-xing1, WEN Xin1, LUO Jun-xiao1, LIU Hua-zu1, LI Wei1,2
1. College of Environment and Ecology, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of the Three Gorges Reservoir Rigon's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
Abstract:To explore the effects and mechanisms of algae on Daphnia magna's resistance to pesticides, five algal species (Pyrrophyta, Bacillariophyta, Chlorophyta, Cryptophyta and Cyanophyta) were fed in equal amount to zooplankton Daphnia magna, which was then exposed to two insecticides: imidacloprid (water-soluble) and esfenvalerate (fat-soluble). The median lethal concentration (LC50), stoichiometric ratio (P:C, N:C) and fatty acid content of Daphnia magna were determined. The results show that, compared with biogenic chemical elements such as nitrogen and phosphorus, N3 unsaturated fatty acids can better reveal the predation of Daphnia magna on planktonic algae. The content of N3 unsaturated fatty acids in algae was a key factor affecting the resistance of Daphnia magna to water-soluble pesticides. The difference in Daphnia magna resistance was more obvious to fat-soluble pesticides than to water-soluble pesticides. Therefore, the N3 unsaturated fatty acids is the best predictor of the resistance of Daphnia magna to water-soluble pesticides, and can be used to monitor the resistance and risk of Daphnia magna food chain to pesticides in a natural environment.
何妍, 石琬绮, 彭鑫鑫, 杨巍, 李锗镡, 文昕, 罗竣潇, 刘华祖, 李伟. 藻类对大型溞抵抗农药的毒理学影响及其机制[J]. 中国环境科学, 2022, 42(9): 4416-4422.
HE Yan, SHI Wan-qi, PENG Xing-xing, YANG Wei, LI Zhe-xing, WEN Xin, LUO Jun-xiao, LIU Hua-zu, LI Wei. Ecotoxicological effects and mechanism of algae on Daphnia Magna's resistance to pesticides. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4416-4422.
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