Conservation of the red-shanked douc Pygathrix nemaeus in Lao People's Democratic Republic: density estimates based on distance sampling and habitat suitability modelling

摘要: The Endangered red-shanked douc Pygathrix nemaeus is a charismatic Asian colobine endemic to Vietnam, Cambodia and Lao People's Democratic Republic (PDR). largest population found in central-eastern PDR but it has never been quantified. We conducted line-transect surveys Nakai–Nam Theun National Protected Area 2011–2012. used distance sampling combined with habitat suitability model estimate group density abundance the area. Our analysis yielded of 2.8 (range 1.9–4.1) groups per km2 c. 4,420 within predicted 1,600 suitable Theun. These are only available data for P. date. discuss limitations our survey, which involved potential violations method, highlight challenges using this method primates. also consider importance assessing studies, evaluate reliability facilitate comparisons. under threat from illegal hunting not focus any specific conservation action. To avoid repetition decline species already experienced secure species' global survival, projects need target A long-term research project key biodiversity area will benefit other threatened unique co-existing species.