【摘 要】
：
A series of tests (lethal, sublethal, and behavioral) on earthworms were conducted as an eeo-assessment of pesticides. In this study, the toxicity of cypermethr
【机 构】
：
Department of Basic Courses,Laboratory for Conservation and Utilization of Bio-Resource and School o
【基金项目】
：
云南省教育厅资助项目;the Program for New Century Excellent Talents in Chinese University;国家自然科学基金;the Program for New Century Excellent Talents in Chinese University
论文部分内容阅读
A series of tests (lethal, sublethal, and behavioral) on earthworms were conducted as an eeo-assessment of pesticides. In this study, the toxicity of cypermethrin-contaminating soil on adult and juvenile earthworms was assessed. Beside the acute and chronic tests, an avoidance response test was carried out. It was shown that the all-round toxicity from cypermethrin was weak on adult earthworms. Compared with adult earthworms, the toxicity of juvenile earthworms from cypermethrin especially chronic toxicity increased significantly. Growth and reproduction of earthworms appeared to be more severely affected by cypermethrin at juvenile stage than at adult stage. Applied at 10 mg/kg, cypermethrin had obvious adverse impact on the growth of juvenile earthworms, while 20 mg/kg, cypermethrin caused significant toxic effects in reproduction. The results also indicated that ecotoxicologieal risk assessment using only adult specimens may underestimate the effects of cypermethrin on soil invertebrate populations.
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