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- W2365785110 abstract "Chronic toxicity of fenvalerate, beta-cypermethrin, chlorpyrifos and triazophos (towards) water flea, Daphnia magna, was tested in a 21 d test. Chlorpyrifos of ≥0.5 μg/kg and (fenvalerate) (and) (beta-cypermethrin) (of) (≥0.05) (μg /kg) (significantly) (prolonged) (the) (days) (to) (first) (pregnancy) and the days to first breeding, while triazophos had no impact on the above two (parameters) in range of concentrations tested (0.05～2.0 μg /kg). Compared with the days to first pregnancy and the days to first breeding, parameters such as the number of first brood, the total number of offspring and the total number of broods laid during the 21 d period, intrinsic rate of natural (increase(r)) seemed more sensitive to insecticide exposure. At the end of 21 d exposure the body length was not affected by chlorpyrifos and triazophos, while fenvalerate and beta-(cypermethrin) of ≥0.025 μg/kg significantly degraded the length of the body of the daphnia. (Taking) all the tested parameters into consideration itcoued be gound that the non-effective (concentration) (NOEC) of fenvalerate, beta-(cypermethrin,) chlorpyrifos, and triazophos were (0.005,) (0.005,) (0.01,) (0.05 μg/kg), respectively. In contrast with the organophosphorus (insecticides,) (the) (body) length could serve as a special index of pyrethroid (exposure.) Integrating (48 h)LC(50)s with the corresponding NOEC, the application factor (AF) of the 4 insecticides in range of 0.004~0.012 could be calculate. The present study suggests that insecticide contamination (results) from spray draft and run-off may cause both acute and chronic hazards on sensitive (organisms,) such as daphnia, in aquatic ecosystem. Since large diversity exists among the AFs it is better to undergo actual longer-term experiment, rather than by prediction, to determine the impact of certain insecticide on population dynamics of daphnia." @default.
- W2365785110 created "2016-06-24" @default.
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- W2365785110 date "2004-01-01" @default.
- W2365785110 modified "2023-09-26" @default.
- W2365785110 title "Chronic Toxicity of Several Insecticides to Daphnia magna" @default.
- W2365785110 hasPublicationYear "2004" @default.
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