Distribution and Population Densities of Diurnal Primates in the Karst Forests of Phong Nha – Ke Bang National Park, Quang Binh Province, Central Vietnam

Haus, Tanja; Vogt, Martina; Forster, Bernhard; Vu, Ngoc; Ziegler, Thomas
April 2009
International Journal of Primatology;Apr2009, Vol. 30 Issue 2, p301
Academic Journal
We studied the status and distribution of the diurnal primates in the Phong Nha – Ke Bang National Park (PNKB NP) from April to August 2007. In the past, researchers reported 9 primate species and subspecies for the karst forests of PNKB NP, which constitutes the most important protected area for the endangered Hatinh langur ( Trachypithecus hatinhensis) in Vietnam. All 9 primate taxa are threatened due to hunting pressure and habitat loss. We applied line transect sampling in 4 areas. During a total of 117 transect inspections along 12 different transect routes, we confirmed 5 primate taxa and the analysis of population densities resulted in 2143 (±467) Hatinh langurs, 1316 (±871) red-shanked douc langurs ( Pygathrix nemaeus), 930 (±489) stump-tailed macaques ( Macaca arctoides), 986 (±883) eastern Assamese macaques ( M. a. assamensis), and 18 (±18) southern white-cheeked crested gibbons ( Nomascus siki) in the whole PNKB NP, which covers an area of ca. 85,000 ha. We could not detect the 2 nocturnal lorises, Bengal slow lorises ( Nycticebus bengalensis) and pygmy slow lorises ( N. pygmaeus), as well as rhesus macaques ( Macaca mulatta) and northern pig-tail macaques ( M. leonina). The distribution of the primates predominantly depended on human impact. We could not recognize a correlation between habitat constitution and abundance of primates. The population density estimates showed a much higher density of the Hatinh langur than previously assumed. Thus the importance of the PNKB NP for the conservation of this endangered langur increased significantly.


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