Ecology and Conservation Status of the black-shanked douc (Pygathrix nigripes) in Nui Chua and Phuoc Binh National Parks, Ninh Thuan Province, Vietnam

摘要: The importance of understanding determinants underlining distribution, abundance, social organization and feeding ecology animal has become increasingly vital to develop either appropriate in-situ or ex-situ conservation plans for endangered species. This study applied ecological socioecological models determine the habitat preferences, organisation black-shanked douc (Pygathrix nigripes Milne- Edwards, 1871), an primate with a restricted distribution in southern Vietnam eastern Cambodia. Using systematic survey this thesis provides first evaluation patterns douc; assessment structure, home range species Nui Chua Phuoc Binh National Parks. also model predict potential occurrence regional population Ninh Thuan Province. found that distributed at wide elevation from sea level as much 1,500 m various vegetation types including mixed coniferous/broadleaf forest, sub-montain evergreen sclerophyll bamboo/broadleaf semi-deciduous deciduous scrubs thorny woodland. preferred foraging on trees growing gully area along streams. avoided areas which did not support its locomotion provide food, was too close human habitation. Its associated season influenced by steepness, position landscape, nearest distance water source types. results revealed abiotic factors generally indirectly through food patches. Demographic data NPs showed large douc. minimum number recorded 470 163 respectively. Within populations, proportion immature higher than mature. doucs live groups mean group size populations were 13.06 ± 9.60 10.13 5.03 exhibited flexible one male unit band. female well outweighted males typical sex ratio numbering two females male. effects structure confirmed. However, fission may occur due mating competition. Mean estimated three ranged between 30 50 ha. Comparison different sizes differ significantly. daily path length 952 228 m. Groups lived low quality forest travelled significantly longer distances high forest. Activity colobines. spent more time moving early morning late afternoon resting 11:00 14:00. activity budget day light hours seasons. In dry season, increased reduced while they rainy season. adults juveniles. ate 152 plant They consumed leaves 117 species, fruit 42 flower 17 seeds 11 petioles diet comprised 54.6% leaves, 29.34% fruits, 14.56% flowers 1.51% other. Type hours, months fruits fewer less afternoon. that, broadly distribute A predicted around 76,000 ha about 30000 (less 10% total area) probably probability over 50% based physical site characteristics. Forests Province 2600 5900 individuals. biggest problem suitable fragmented. remnants act sink recolonisation small patches metapopulation maintain themselves if management are applied.