Increased stress in Asiatic black bears relates to food limitation, crop raiding, and foraging beyond nature reserve boundaries in China


下载量2
发布日期2017-09-22
资源类型报告
全部作者Karl D. Malcolm , William J. McShea , David L. Garshelis , Shu-Jin Luo , Timothy R. Van Deelen , Fang Liu , Sheng Li , Lin Miao , Dajun Wang , Janine L. Brown
机构团队北京大学自然保护与社会发展研究中心
关键字Agriculture Fecal glucocorticoids Mast Poaching Protected areas Stress
引用方式Malcolm K D, Mcshea W J, Garshelis D L, et al. Increased stress in Asiatic black bears relates to food limitation, crop raiding, and foraging beyond nature reserve boundaries in China[J]. Global Ecology & Conservation, 2014, 2:267-276.
知识共享许可协议署名-非商业性使用-相同方式共享

知识共享许可协议(本作品采用知识共享署名 4.0 国际许可协议进行许可)


摘要

Asiatic black bears (Ursus thibetanus) are declining throughout much of their range. In China they are partially protected by a nature reserve system and rely heavily on hard mast as a food source prior to winter denning. Bears may compensate for mast shortages by raiding agricultural crops and killing livestock, mainly outside reserves where they are exposed to increased threats of poaching. We hypothesized that stress would vary with availability of high-quality refugia and fluctuations in mast abundance. We collected fecal samples from free-ranging bears in and around nature reserves in southwestern China, recorded habitat characteristics at each fecal sample location, and quantified abundance of hard mast. We used feces for genetic and endocrine analysis and identified 106 individuals. Feces collected outside reserves, or in agricultural fields within reserves, contained elevated concentrations of glucocorticoid metabolites compared to samples collected in intact, mast-producing forests within reserves. Relationships with habitat variables indicated that the hypothalamic–pituitary–adrenal (HPA) axis of the Asiatic black bear is responsive to human activity, abundance of hard mast, extent of forest cover, and quality of diet. Our findings demonstrate biological reactions of a large mammal to variable forest quality, human threats, and foraging relative to boundaries of protected areas.


下载>>(大小 0.6100M)
真实姓名
联系电话
电子邮箱
机构名称
下载用途
验证码
我已经认真阅读并同意自然观察网的《使用协议》。