桂林地区克氏原螯虾对泽蛙蝌蚪的捕食

Predation impact of Procambarus clarkii on Rana limnocharis tadpoles in Guilin area

克氏原螯虾(Procambarus clarkii)已入侵我国江苏、湖北、江西、安徽等多个省(市)。为研究克氏原螯虾对其生境中主要两栖动物泽蛙(Rana limnocharis)的影响,我们于2006年5-6月对广西桂林地区自然生境中克氏原螯虾和泽蛙蝌蚪的数量和密度进行了调查,7月在室内进行了克氏原螯虾对泽蛙蝌蚪和饰纹姬蛙(Microhyla ornata)蝌蚪的捕食实验。野外调查结果表明克氏原螯虾的密度与泽蛙蝌蚪的密度呈显著负相关。室内实验结果表明克氏原螯虾对泽蛙蝌蚪的捕食强度与克氏原螯虾体长呈显著正相关,且对泽蛙蝌蚪的捕食强度高于饰纹姬蛙蝌蚪。表明克氏原螯虾对两栖类幼体有比较严重的危害,应加强监测,采取相应措施预防和控制其危害。

Procambarus clarkii has invaded many provinces in China, such as Jiangsu, Hubei, and Anhui. In order to evaluate its effect on Rana limnocharis, we investigated the population density of P. clarkii and R. limnocharis in their natural habitat in Guilin between May and June in 2006. As a comparison, we also carfled out indoor experiments to study P clarkii predation on the tadpole of R. limnocharis and Microhyla ornata. The field investigation showed that there was a significantly negative correlation between the density of P clarkii and that of R. limnocharis tadpoles, while indoor experimants showed that the number of R. limnocharis tadpoles preyed by Procambarus clarkii was positively correlated with P clarkii＇s body length, and more R. limnocharis tadpoles were preyed than M. ornata tadpoles. Our results suggest that P clarkii is likely to endanger amphibian larva, therefore, it should be monitored and controlled.