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International Journal of Primatology

, Volume 36, Issue 5, pp 1036–1054 | Cite as

Feeding Postures of Cao Vit Gibbons (Nomascus nasutus) Living in a Low-Canopy Karst Forest

  • Hanlan Fei
  • Changyong Ma
  • Thad Q. Bartlett
  • Ran Dai
  • Wen Xiao
  • Pengfei Fan
Article

Abstract

Food acquisition is an important factor in the evolution of primate postural behavior. Gibbons are well known for their ability to exploit terminal branches by means of below branch suspensory feeding, but few studies of gibbon positional behavior have been conducted since the seminal work of the 1970s and 1980s. We studied the feeding posture of three cao vit gibbon groups living in degraded karst forest in Bangliang Gibbon Nature Reserve between August 2008 and December 2009 to determine if body mass, age, and food type affect feeding posture. We found that cao vit gibbons spent most of their time feeding from branches (59.4 %) and twigs (33.2 %) in the middle canopy of the forest (5–10 m). They used suspensory hanging and sitting as their main feeding postures. Large-bodied gibbons spent more time on larger supports than smaller juveniles when feeding on nonfig fruit and leaves. In addition, gibbons of all age–sex classes adopted a suspensory posture more often when using smaller (twigs) or more flexible (lianas) supports. We found little evidence of age–sex differences in the frequency of suspensory feeding. The subtle differences we did detect suggest that intragroup feeding competition or ontogeny may confound the body size effects on feeding posture. Overall our findings conform to the view that within species positional behavior is largely constrained by musculoskeletal anatomy and not by habitat quality because cao vit gibbons showed a similar pattern of canopy and substrate use to gibbons occupying less disturbed forests.

Keywords

Age–sex categories Body mass Cao vit gibbon Feeding postures Suspensory 

Notes

Acknowledgments

This study was supported by the National Youth Outstanding Talent Support Program of China, Conservation Leadership Program (CLP), Fauna and Flora International (FFI), and International Foundation for Science (IFS). Idea Wild provided equipment for this research. All research methods adhered to the Chinese legal requirements. Many thanks are given to Mrs. Yan Lu from FFI China and Mr. Paul Insua-Cao from FFI Vietnam for their kind help. We thank Mr. Tan Wujin, Huang Tao, Huang Tianzhu, Lin Yucong, Yang Xiao, Yao Zhongming, Nong Qunce, Chen Guoyu, Liang Yaojie, and Zhou Jingpei from the Jingxi Forestry Bureau for their needed support. Dr. Paul A. Garber, Dr. Joanna Setchell, and three reviewers provided invaluable comments to improve the original manuscript.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Institute of Eastern–Himalaya Biodiversity ResearchDali UniversityDaliPR China
  2. 2.Department of AnthropologyThe University of Texas at San AntonioSan AntonioUSA

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