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| Effects of Environment Hormone Dimethoate on the Reproduction of Brachionus calyciflorus |
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| KeyWord:Brachionus calyciflorus; dimethoate; population growth rate; life-table; resting egg |
| Author Name | Affiliation | | Lu Lin-lan | College of Chemistry and Biology Engineering, Yancheng Institute of Technology, Key Laboratory of Aquaculture and Ecology of Coastal pool of Jiangsu Province, Yancheng 224051，China | | ZHU Dan-dan | College of Chemistry and Biology Engineering, Yancheng Institute of Technology, Key Laboratory of Aquaculture and Ecology of Coastal pool of Jiangsu Province, Yancheng 224051，China | | DONG Xue-xing | College of Chemistry and Biology Engineering, Yancheng Institute of Technology, Key Laboratory of Aquaculture and Ecology of Coastal pool of Jiangsu Province, Yancheng 224051，China |
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| Abstract: |
| Toxic effects of dimethoate on Brachionous calyciflorus were examined in laboratory using 2 d population growth test and life-table techniques. Increasing dimethoate concentrations significantly decreased the population growth rate and net reproductive rate（R0） of B. calyciflorus. There was a significant negative relationship between dimethoate concentrations and R0. However, treatment with 0.000 5 mg·L-1 dimethoate increased the population growth rate by 10.81%. Compared with the control group, the resting eggs production increased by 64.71% and 76.47% at 0.012 5 mg·L-1 and 1.562 5 mg·L-1 dimethoate, and the resting egg hatching rate decreased by 36.84% and 21.05% at 0.062 5 mg·L-1 and 1.562 5 mg·L-1 dimethoate, respectively. In 3 d test, the population parameters of offsprings of B.calyciflorus exposed to dimethoate were not significantly different from their parent. The results indicate that the net reproductive rate of B. calyciflorus might be used as a sensitive indicator of dimethoate and dimethoate might not have significant transgenerational reproductive impacts. |
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