A series of tests (lethal,sublethal,and behavioral) on earthworms were conducted as an eco-assessment of pesticides.In this study,the toxicity of cypermethrin-contaminating soil on adult and juvenile earthworms was as...A series of tests (lethal,sublethal,and behavioral) on earthworms were conducted as an eco-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...展开更多
Toxicities were assessed for a pyrethroid （cypermethrin） and an organophosphate insecticide （chlorpyrifos） individually and in combination. A series of tests were conducted on different responses （acute, chronic,...Toxicities were assessed for a pyrethroid （cypermethrin） and an organophosphate insecticide （chlorpyrifos） individually and in combination. A series of tests were conducted on different responses （acute, chronic, behavioral） of earthworms of species Eisenia fetida andrei in the ecological risk assessment of these pesticides. The results showed that the toxicity of the mixture of cypermethrin and chlorpyrifos was significantly higher than either of these pesticides individually, especially on the earthworm’s chronic responses. At a concentration of 5 mg/kg, the mixture caused significant reductions on the growth and reproduction rates of earthworms, but did not cause any significant effect when the individual was tested. The increase in toxicity of the pesticide mixture means that the use of toxicity data obtained exclusively from single-pesticide experiments may underestimate the ecological risk of pesticides that actually present in the field.展开更多
基金the Program for New Century Excellent Talents in Chinese University (No.NCET-04-0914)the National Natural Science Foundation of China (No.30570281)+1 种基金the Yunnan Natural Science Foundation (No.2002C0001Z,2005C0004Q)the Natural Science Foundation of Ministry of Education of Yuannan (No.08Z0028)
文摘A series of tests (lethal,sublethal,and behavioral) on earthworms were conducted as an eco-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...
基金supported by the Program for New Century Excellent Talents in Chinese University(No.NCET-04-0914)the National Science Foundations of China(No.30760049,30570281)+1 种基金the Yunnan Natural Sciences Foundations(No.2009ZC078M,2008CD140)the Natural Sciences Foundations of Ministry of Education of Yunnan(No.08Z0028)
文摘Toxicities were assessed for a pyrethroid （cypermethrin） and an organophosphate insecticide （chlorpyrifos） individually and in combination. A series of tests were conducted on different responses （acute, chronic, behavioral） of earthworms of species Eisenia fetida andrei in the ecological risk assessment of these pesticides. The results showed that the toxicity of the mixture of cypermethrin and chlorpyrifos was significantly higher than either of these pesticides individually, especially on the earthworm’s chronic responses. At a concentration of 5 mg/kg, the mixture caused significant reductions on the growth and reproduction rates of earthworms, but did not cause any significant effect when the individual was tested. The increase in toxicity of the pesticide mixture means that the use of toxicity data obtained exclusively from single-pesticide experiments may underestimate the ecological risk of pesticides that actually present in the field.
