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| Effects of Carbaryl on Acute Toxicity and Life Cycle Parameters of Brachionus calyciflorus |
| Received:July 23, 2014 |
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| KeyWord:carbaryl;Brachionus calyciflorus;median lethal concentration;life cycle parameters |
| Author Name | Affiliation | E-mail | | LIU Jian-feng | College of Life Sciences, South-Central University for Nationalities, Wuhan 430074, China | | | GENG Hong | College of Life Sciences, South-Central University for Nationalities, Wuhan 430074, China | genghong@mail.scuec.edu.cn | | HE Meng | College of Life Sciences, South-Central University for Nationalities, Wuhan 430074, China | |
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| Abstract: |
| Carbaryl(C12H11NO2), a carbamate insecticide, has been used worldwidely since 1956. Previous studies have been focused on mammals, amphibians, and fishes. However, little information was available on rotifers. In this study, we used freshwater rotifer, Brachionus calyciflorus, as a model species, which is distributed widely in lakes, rivers, and ponds, to examine the ecotoxicity of carbaryl on small aquatic animals. Rotifer was originally collected from South Lake, Wuhan in 2013, and cultured continuously in the laboratory ever since. The acute effects of carbaryl on the life cycle of rotifer Brachionus calyciflorus was studied under laboratory conditions at(25±1)℃. The results showed that the 24 h LC50 value of carbaryl was 4.868 mg·L-1 for B. alyciflorus, and exhibited a probit model equation:Probit(P)=6.465X-4.444, with 95% confidence interval of 4.538~5.229 mg·L-1. The chronic toxicity showed that carbaryl had a obvious impact on main developmental stages, average life span, net reproduction rate, intrinsic rate of increase and generation time of rotifer except its spawning. Compared with the control group, carbaryl significantly reduced the average life span, net reproduction rate and intrinsic rate of increase, with greater effects on life span and intrinsic rate of increase at high concentrations. Larval stage length and embryonic development time extended with increasing carbaryl concentrations. Carbaryl significantly shortened the generation time of the rotifer, except at 2.2 mg·L-1. |
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