作者机构:[1]Department of Biology, Chongqing University of Science and Technology, Chongqing 401331, P.R.China, [2]Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P.R. China
相关基金:Acknowledgements The authors thank the National Natural Science Foundation of China (90202009) for financial support.