中国科学院西双版纳热带植物园机构知识库

Shifting cultivation is a major driver of deforestation in tropical uplands. In western Myanmar, population growth has intensified the practice, shortening fallow periods and resulting in increased habitat degradation and fragmentation, which threaten wildlife survival. Arboreal species such as gibbons are particularly vulnerable due to their reliance on continuous canopy cover for survival. We investigated how shifting cultivation and associated human disturbances affect the density and abundance of the Western hoolock gibbon (Hoolock hoolock) in Man Wildlife Sanctuary, a newly established protected area, and its surrounding forest landscape in western Myanmar. Data were collected using point counts at 36 sampling grids covering 113 km2 over 8 months (April-November 2023). Density estimates were derived from abundance using N-mixture models, and we examined the influence of landscape and human disturbance covariates on spatial variation in gibbon abundance across the study area. We estimated an average density of 1.6 groups/km2. Of the seven landscapes and eight disturbance covariates tested, fire-related disturbances and proximity to human settlements-both closely associated with shifting cultivation-had the strongest negative influence on gibbon density. Our results suggest that Man Wildlife Sanctuary and its surrounding forests support a moderate density of Western hoolock gibbons compared with other regions in Myanmar. The lack of effective protection and management is a major problem, highlighting the need for targeted conservation measures and land-use planning to mitigate these threats.