Antipredation Sleeping Behavior of Skywalker Hoolock Gibbons (Hoolock tianxing) in Mt. Gaoligong, Yunnan, China
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Studying sleeping behavior can provide key information for understanding the ecology of a species. Antipredation is an important factor that affects primate sleeping behavior. We studied antipredation sleeping behavior in skywalker hoolock gibbons (Hoolock tianxing). We studied one group (NA) and a solitary female (NB) at Nankang from July 2010 to September 2011, and another group (BB) at Banchang from May 2013 to December 2014 in Mt. Gaoligong, Yunnan, China. Over the study period, we recorded 67 sleeping trees for members of group NA over 92 days, 17 trees for the solitary female NB over 22 days, and 159 trees for members of group BB over 186 days. Skywalker hoolock gibbons at both sites rarely used the same tree on consecutive days (N = 3 at both sites). They traveled fast to enter sleeping tree a mean of 160 ± SD 43 min before sunset at Nankang, and a mean of 192 ± SD 40 min before sunset at Banchang. They seldom (Nankang: 14%, N = 183 observations; Banchang: 25%, N = 548 observations) defecated in sleeping trees. They slept at sites with more tall and large trees and preferred to sleep on tall trees in the site. They slept on branches of small diameter and closer to tree tops. Our study suggests that antipredation plays an important role in skywalker hoolock gibbons’ sleeping tree selection and sleeping behavior. In addition, our data suggest potential effects of habitat degradation on gibbons’ sleeping behavior. Tall trees are especially important for gibbons in degraded forest and should be protected.
KeywordsConservation Habitat degradation Hoolock tianxing Predation avoidance Sleeping behavior
This study was supported by the National Natural Science Foundation of China (#31160424), the National Program for Support of Top-notch Young Professionals in China, Small Nature Fund of Gaoligong National Nature Reserve (#201306, #201409, #201215), and Collaborative Innovation Center for Biodiversity and Conservation in the Three Parallel Rivers Region of China. We would like to thank the staff from the Gaoligongshan National Nature Reserve for their needed support. We also thank Mr. Yong Chai from Yunnan Forestry Academy of Sciences and Mr. Xiaochun Shi from Gaoligongshan National Nature Reserve for their kind help in identifying the plant herbariums. The manuscript was remarkably improved with the valuable comments from two anonymous reviewers and two editors, Prof. Joanna M. Setchell and Dr. Onja Harinala Razafindratsima.
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Conflict of Interest
All authors claimed no conflict of interest.
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