Dead trees as an indicator in tourism risk monitoring at primate ecotourism sites. Issue 1 (24th March 2022) - Yang, Bin; Hong, Bo; Anderson, James R; Fu, Wei-Wei; Ren, Yi; Gou, Ni-Na; Shen, Jie-Na; Jia, Kang-Sheng; Lei, Ying-Hu; Wang, Kai-Feng; Mao, Min; Li, Bao-Guo