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- Title
A MARK-RECAPTURE POPULATION SIZE ESTIMATION OF SOUTHERN YELLOW-CHEEKED CRESTED GIBBON Nomascus gabriellae (Thomas, 1909) IN CHU YANG SIN NATIONAL PARK, VIETNAM.
- Authors
Thinh Tien Vu; Dung Van Tran; Toan Trong Giang; Van Huu Nguyen; Manh Dac Nguyen; Thanh Chi Nguyen; Nga Kieu Tuyet; Doherty, Paul
- Abstract
The Southern Yellow-cheeked Crested Gibbon Nomascus gabriellae occurs in southern Vietnam and southeastern Cambodia and is an IUCN Red List Endangered species. The species occurs in Chu Yang Sin National Park (CYSNP), Vietnam, but quantitative data were lacking. We conducted an auditory point count survey in 2012 to estimate the number of gibbon groups. We analyzed the data using a mark-recapture framework in program MARK to adjust for variation in the gibbon daily calling probability. Twenty-eight gibbon groups were detected during the survey. The species inhabited only broadleaf evergreen forest, mixed forest with broadleaf and bamboo, mixed broadleaf and coniferous forest. On average, 87.5% of the gibbon groups were detected in the three survey days at each listening post. We estimated the number of gibbon groups in the surveyed area to be 32.25 (CI: 25.26-39.24) and the total number of gibbon groups in CYSNP to be 166 (CI: 135.04-203.84). Thus the estimated Southern Yellow-cheeked Crested Gibbon population of CYSNP is the largest known gibbon population in Vietnam and CYSNP is an important conservation area for the species.
- Subjects
NOMASCUS; QUANTITATIVE research; SPECIES distribution
- Publication
Asian Primates Journal, 2016, Vol 6, Issue 1, p33
- ISSN
1979-1631
- Publication type
Article