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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 36, No. 3, 2015, pp. 152-160
Bioline Code: zr15018
Full paper language: English
Document type: Report
Document available free of charge

Zoological Research, Vol. 36, No. 3, 2015, pp. 152-160

 en Social organization of Shortridge's capped langur (Trachypithecus shortridgei) at the Dulongjiang Valley in Yunnan, China
LI, Ying-Chun; LIU, Feng; HE, Xiao-Yang; MA, Chi; SUN, Jun; LI, Dong-Hui; XIAO, Wen & CUI, Liang-Wei

Abstract

Non-human primates often live in socially stable groups characterized by bonded relationships among individuals. Social organization can be used to evaluate living conditions and expansion potential. Bisexual group size, ratio of males to females and group composition are essential elements determining the type of social organization. Although the first report on Shortridge's capped langurs (Trachypithecus shortridgei) was in the 1970s, until now, the species only inhabits forests of the Dulongjiang valley in northwest Yunnan, China, with c. 250-370 individuals in 19 populations. To understand its social organization, we collected data from five groups of Shortridge's langurs at Silaluo in the Dulongjiang valley during August 2012-October 2013. Family groups consist of one adult male, 2–3 adult females and up to five young. Group size averaged 8 (7-9) individuals. The ratio of adult males to females (M/F) was 1:2.9, infants to adult females was (I/F) 1:2.2; and ratio of adults to immatures was 1:1.2, indicating the potential of a population increasing. Birth season was during March-July and the inter-birth interval was two years.

Keywords
Trachypithecus shortridgei; Social organization; One-male, multi-female group; Multi-male, multi-female group; Group size

 
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