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Pygathrix cinerea (gray-shanked douc langur)
- Population trend: decreasing
- Global population
- Likely less than 2,000 individuals (Long et al. 2020)
Pygathrix nemaeus (red-shanked douc langur)
- Population trend: decreasing (Coudrat et al. 2020)
- Largest population likely in Nakai-Nam Theun National Park Area, Lao PDR (Coudrat et al. 2020)
- Other large populations in Vietnam (Coudrat et al. 2020)
Pygathrix nigripes (black-shanked douc langur)
- Population trend: decreasing (Duc et al. 2020)
- Largest populations in Cambodia (Seima Biodiversity Conservation Area): 42,000 individuals total (Pollard et al. 2007; Duc et al. 2020)
- Largest populations in Vietnam (Bu Gia Map National Park) approximately 1,800 individuals (Duc et al., in prep; Duc et al. 2020)
- Pygathrix cinerea (grey-shanked douc langur): Critically Endangered (2015 assessment) (Long et al. 2020)
- Pygathrix nemaeus (red-shanked douc langur): Critically Endangered (2015 assessment) (Coudrat et al. 2020)
- Pygathrix nigripes (black-shanked douc langur): Critically Endangered (2015 assessment) (Duc et al. 2020)
U.S. Endangered Species Act
- Pygathrix nemaeus: Endangered (U.S. Fish & Wildlife Service 2020)
Threats to Survival
Threats to survival (Lippold & Vu 1998)
- Vietnam has now lost over 80% of its historical forest cover. Only 10-20% of closed tropical forest remains.
- During the Vietnam War (1963-1975) over 72 million liters of herbicide were sprayed and approximately 22,000 sq acres of agricultural land and forests destroyed
- Rapid human population growth. More than 70 million people in 1990 - 80% of the population practices subsistence agriculture. Remaining forests are subject to commercial logging, hunting and clearance.
- Government policy of relocating landless northerners to central highlands is decimating forests and wildlife
- Large-scale logging operations in most of major forests
- Hunting for bush meat and medicinal purposes is a major activity. Many firearms in the country after years of warfare
- Illegal trade with China
- Subjects for taxidermy
- Protected wildlife is for sale in markets throughout the country
- Outside protected areas, remaining primate populations will become more fragmented
- Vietnam Government inaugurated first national park at Cuc Phuong in 1962
- In 1986 additional national parks and reserves were established. Currently there are 87 areas totaling approximately 3% of Vietnam
- A National Conservation Strategy was prepared in 1985. The National Plan for Environment and Sustainable Development was created in 1991.
- At least 11 laws protect wildlife and CITES membership is in effect but law enforcement is weak, guards are underpaid, and punishments minimal (Without a set value on an endangered species it becomes impossible to set a fine for illegal hunting.)
Threats to Langurs
Forest logging, hunting for bushmeat, and human population growth are causing drastic declines in douc langur populations.
Image credit: © San Diego Zoo Wildlife Alliance. All rights reserved.
MacKinnon and MacKinnon (1987)
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