1Anthropology, University of Colorado at Boulder, 2Biology, College of Science - Vietnam National University, Hanoi
Friday All day, Plaza Level
We studied the diet and food availability of Tonkin snub-nosed monkey (Rhinopithecus avunculus) for 18 months (from December 2004 to May 2006) in Khau Ca area of Ha Giang Province, Vietnam. This species uses 32 plant species. Its dietary composition includes leaf petioles, ripe and unripe fruits, young leaves, flowers, and seeds. Reflecting seasonal changes of the Khau Ca forest, Tonkin snub-nosed monkeys eat more young leaves and flowers in the period of March to May and more fruits in August to October. Among four botanical one-km transects, 385 trees (34.90%) occupied 44.20% of total basal area and 16 species (10.47%) are used by the Tonkin snub-nosed monkeys. Some food plant species including Excentrodendron tonkinense (Tiliaceae), Garcinia spp. (Clusiaceae), Olea sp. (Oleacceae), Diospyros spp. (Ebenaceae) and Iodes seguini (Icacinaceae) dominate the Khau Ca forest. Although the Khau Ca area contains the largest and only viable population of Tonkin snub-nosed monkeys with a population of just over 100 individuals, only 700 ha of less 1,000 ha Khau Ca forest is suitable habitat for the monkeys. Thus forest rehabilitation and expansion programs are needed to increase the available habitat for Tonkin snub-nosed monkeys in Khau Ca.