Abstract
AbstractOne of the three Critically Endangered and endemic primate species in Viet Nam, Delacour's langur Trachypithecus delacouri, is restricted to the north of the country. The largest remaining population is in Van Long Nature Reserve, Ninh Binh Province, and the second largest is in nearby Kim Bang Protection Forest, Ha Nam Province, with other populations believed to be too small for recovery. The population in Van Long has been well studied but the status of that of Kim Bang has not previously been adequately evaluated. To address this, a survey was conducted during 10 August–7 October 2018. In total, we recorded 13 groups comprising a total of at least 73 individuals, almost doubling the highest number reported in previous studies. We documented six new groups in Lien Son and Ba Sao communes in Kim Bang. Our findings indicate there is a high likelihood that Delacour's langur population in Kim Bang will recover and could be important for the long-term conservation of this Critically Endangered species. However, immediate and appropriate conservation measures need to be implemented to protect the population from major anthropogenic threats, namely poaching and habitat destruction, detected during our survey.
Highlights
One of the three Critically Endangered and endemic primate species in Viet Nam, Delacour’s langur Trachypithecus delacouri, is restricted to the north of the country
Delacour’s langur is one of several species of the Trachypithecus francoisi group, which all occur in forest on ANH TUAN NGUYEN* (Corresponding author, orcid.org/0000-0001-6977-9970) and MINH LE‡ Faculty of Environmental Science, University of Science, Vietnam National University, Hanoi, Viet Nam E-mail tuananhnguyen@hus.edu.vn
The species is restricted to a small area of northern Viet Nam, formerly in remnant forest patches in the provinces of Hoa Binh, Ha Nam, Ninh Binh and Thanh Hoa (Nadler et al, ; Workman, )
Summary
One of the three Critically Endangered and endemic primate species in Viet Nam, Delacour’s langur Trachypithecus delacouri, is restricted to the north of the country. Keywords Critically Endangered, Delacour’s langur, population survey, Trachypithecus delacouri, Kim Bang Protection Forest, Viet Nam Delacour’s langur is one of several species of the Trachypithecus francoisi group, which all occur in forest on ANH TUAN NGUYEN* (Corresponding author, orcid.org/0000-0001-6977-9970) and MINH LE‡ ( orcid.org/0000-0002-2953-2815) Faculty of Environmental Science, University of Science, Vietnam National University, Hanoi, Viet Nam E-mail tuananhnguyen@hus.edu.vn
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