Ecology, behavior and conservation of the Tonkin snub-nosed monkey (Rhinophithecus avunculus) in Vietnam [article]

Dong Thanh Hai, University, The Australian National, University, The Australian National
The Tonkin snub-nosed monkey (Rhinopithecus avunculus) is a critically endangered primate and endemic to northern Vietnam. This research was to address the questions about ecology and behavior of a relatively unstudied species in comparison with the other members of the genus Rhinopithecus. I carried out my study in Tat Ke Sector, Na Hang NR and Khau Ca HSCA over 24 months, from September 2004 to September 2006. In addition, four other known sites including Ba Be NP, Nam Xuan Lac HSCA, Than
more » ... huong Hoang and Cham Chu NRs were also investigated between 2006 and 2010. Tat Ke and Khau Ca have a relatively similar botanical structure and species composition. The main forest type here is evergreen forests associated with limestone hills. Phenological patterns at both sites were characterized by high production of young leaves throughout the year and seasonality of flowers and fruits. Rainfall correlated with the production of young leaves, flowers and fruits. The social organization follows the typical patterns of other colobines in that the basic structure is one-male unit (OMU). Extra males form all-male units (AMUs). OMUs and AMUs frequently aggregated in large bands for traveling, feeding, resting and sleeping. The species show fission and fusion society as probably as a result of the size of food patches, the abundance and availability of quality food, and human disturbance. Members within OMU have high cohesiveness as a result of close social distance. Social and agonistic interactions within and between units are infrequent, as with many colobines. Males respond aggressively toward the resident males of other one-male units, suggesting the defense of females. Grooming is mostly performed by adult females, suggesting high affiliation between them within OMUs. Juveniles observed provided alloparenting. Seasonality of birth may be related to food quality and the availability of food items. The colour ofthe newborn observed is in contrast to previous reports on R. avunculus and differ from the common pattern in m [...]
doi:10.25911/5d7785aadd737 fatcat:w6iov6fwgbb7fbjnb74pnu6jbe