Title
Group population and density estimates of pileated gibbons, Hylobates pileatus, in four protected areas in the Northern Plains Landscape, Cambodia
Author(s)
WCS
Published
2020
Abstract
Between 2016 and 2019, four protected areas in the Northern Plains Landscape were surveyed to estimate populations of pileated gibbon, Hylobates pileatus: Chhep Wildlife Sanctuary (CWS), Kulen Promtep Wildlife Sanctuary (KPWS), Preah Roka Wildlife Sanctuary (PRWS), and Phonm Tbeng Natural Heritage Park (PTNHP). Using listening posts and a call-based distance sampling methodology, population and density estimates were produced. These estimated group densities are similar to densities recorded at sites in Thailand in 2008. Two sites in PRWS were surveyed in 2006, with estimated densities of 1.55 and 0.78 groups/km2. The 2019 estimate of 0.75 groups/km2 for this site suggests a decline in gibbon density over the past 15 years, although it should be noted that the 2005 surveys were limited in sample size, and the 2019 estimates are limited in their estimation of cue rate and lack of triangulation. Although CWS and KPWS were not surveyed in 2005, their estimated densities are close to the average density for sites surveyed across Cambodia at this time.
Keywords
pileated gibbons; Hylobates pileatus; population estimation; population density; Cambodia
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