杀虫剂敌敌畏和除草剂丁草胺对饰纹姬蛙蝌蚪的急性毒性实验

Acute Toxicity of Pesticide Dichlorvos and Herbicide Butachlor to Microhyla ornata Tadpoles

采用静态换水法研究了杀虫剂敌敌畏、除草剂丁草胺对饰纹姬蛙(Microhylaornata)蝌蚪的急性毒性影响。结果表明,杀虫剂敌敌畏对饰纹姬蛙蝌蚪的2 4- h、4 8 -h的半致死浓度(LC50 )分别为3 91μl/l和1 97μl/l;除草剂丁草胺对饰纹姬蛙蝌蚪的2 4 - hLC50 和4 8- hLC50 分别为3. 37μl/l和1 88μl/l,饰纹姬蛙蝌蚪对丁草胺的敏感性稍大于敌敌畏。

Dichlorvos and butachlor are the most commonly used pesticide and herbicide in China. However, little is known about the toxic effects on amphibians. Feeding stage of Microhyla ornata tadpoles was exposed to dichlorvors and butachlor for 48 hours in static-renewal acute toxic tests. Following range-finding tests, seven concentrations of either dichlorvos or butachlor were determined using equal logarithmic basis. The results showed that the 24-h and 48-h LC_ 50 values of the tadpoles for dichlorvos were 3.91 μl/L and 1.97 μl/L, while for butachlor were 3.37 μl/L and 1.88 μl/L. In the test, the toxicity of butachlor against Microhyla ornata tadpoles was slightly more toxic than that of dichlorvos.