1. Y- Lou, M. Shi, Y. Fang, N. Lyu and Y. Sun (), Key Laboratory of Animal Ecology and Conservation Biology, Inst. of Zoology, Chinese Academy of Sciences, CN-100101 Beijing, PR China. YL and MS also at: Univ. of Chinese Academy of Sciences, Beijing, PR China.
2. J. E. Swenson, Faculty of Environmental Sciences and Natural Resource Management, Norwegian Univ. of Life Sciences, Ås, Norway, and: Norwegian Inst. for Nature Research, Trondheim, Norway