1Anthropology, University of Colorado Boulder, 2Center for Biodiversity and Development, Southern Institute of Ecology, Vietnam
Saturday 9:45-10:00, 200ABC
In Vietnam the globally endangered Indochinese silvered langur (Trachypithecus germaini) is reported to occur to the west of Mekong River but the population is poorly known. Here we report on the status of the species based on archival studies and fieldwork conducted during the past four years covering most of the suitable habitat for this species in the Mekong Delta region of Vietnam. Our surveys confirmed the occurrence of silvered langurs in two previously identified sites and also in two additional locations. We have found the langurs in evergreen and semi-deciduous forests on granite and karst hills and in mangrove forests. The estimated total population is less than 300 individuals, of which 230 are distributed on four small and isolated karst hills and about 45 on Phu Quoc Island of Kien Giang Province. Two other small sub-populations have been confirmed, one in a mangrove plantation in Ca Mau Province and one on a small mountain in An Giang Province. Only the sub-population on Phu Quoc Island is in a protected area. Habitat lost, especially karst quarrying, habitat fragmentation, and hunting are the most serious threats to the langur. At least 108 individuals living on two karst hills that have been allocated to cement companies for quarrying will need to be translocated to safe areas in the next few years. The Indochinese silvered langur in Vietnam is facing extinction in the near future if appropriate management action is not taken.
Margot Marsh Biodiversity Foundation, IUCN Vietnam, the Wenner-Gren Foundation