Summary

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Yellow-cheeked gibbons (Nomascus gabriellae) may be present in Yok Don National Park.
The population size is unknown.
The population trend is unknown.
The site has a total size of 1155 km².
Key threats to gibbons hunting and illegal logging.
Conservation activities are not documented.

Site characteristics

Yok Don National park was established in 1992. Yok Don is the second biggest national park and it is the only national park to conserve dry deciduous dipterocarp forests in Vietnam. Yok Don National Park is home to a high diversity of wildlife including 89 species of mammals, 305 species of birds, 16 species of amphibians, 48 species of reptiles and 858 species of plants, hundreds of species of freshwater fish and thousands of species of insects. Wild elephants, wild water buffalos and gaurs inhabit the site. The park is connected to a large part of protected forests in Cambodia (Yok Don National Park).

Table 1. Basic site information for Yok Don National Park

Area	1155 km²
Coordinates	12.836104, 107.697616
Designation	National Park
Habitat types	Forest

IUCN habitat categories Site designations

Ape status

Most of Yok Don National Park consists of dry deciduous dipterocarp forest which is not suitable habitat for gibbons. Yellow-cheeked gibbons are considered to be rare in the park; only two confirmed records are from this park, one in 2007 and another in 2002-2003 (Rawson et al. 2011).

Table 2. Ape population estimates in Yok Don National Park

Species	Year	Total number indiv. (95% CI)	Total number groups (95% CI)	Density [groups/km²] (95% CI)	Area	Method	Source	Comments	A.P.E.S. database ID
Nomascus gabriellae					Yok Don National Park

Threats

Table 3. Threats to apes in Yok Don National Park

Category	Specific threats	Threat level	Description	Year of threat
1. Residential & commercial development		Unknown
2. Agriculture & aquaculture		Unknown
3. Energy production & mining		Unknown
4. Transportation & service corridors		Unknown
5. Biological resource use	5.1 Hunting & collecting terrestrial animals	Present, but threat severity unknown	Hunting with guns (Rawson et al. 2011).	Ongoing (2011)
	5.3 Logging & wood harvesting	Present, but threat severity unknown	Illegal logging (Rawson et al. 2011).	Ongoing (2011)
6. Human intrusion & disturbance		Unknown
7. Natural system modifications		Unknown
8. Invasive & other problematic species, genes, diseases		Unknown
9. Pollution		Unknown
10. Geological Events		Absent
11. Climate change & severe weather		Unknown
12. Other options		Absent

IUCN Threats list

Conservation activities

Table 4. Conservation activities in Yok Don National Park

Category	Specific activity	Year of activity
1. Residential & commercial development	Not reported
2. Agriculture & aquaculture	Not reported
3. Energy production & mining	Not reported
4. Transportation & service corridors	Not reported
5. Biological resource use	Not reported
6. Human intrusion & disturbance	Not reported
7. Natural system modifications	Not reported
8. Invasive & other problematic species, genes, diseases	Not reported
9. Pollution	Not reported
10. Education & Awareness	Not reported
11. Habitat Protection	11.2. Legally protect primate habitat	Ongoing (2023)
12. Species Management	Not reported
13. Livelihood; Economic & Other Incentives	Not reported

Conservation activities list (Junker et al. 2017)

Challenges

Table 5. Challenges reported for Yok Don National Park

Challenge	Source
Not reported

Research activities

Documented behaviours

Table 6. Ape behaviors reported for Yok Don National Park

Behavior	Source
Not reported

External links

References

Rawson, B. M, Insua-Cao, P., Nguyen Manh Ha, Van Ngoc Thinh, Hoang Minh Duc, Mahood, S., Geissmann, T. and Roos, C. (2011). The Conservation Status of Gibbons in Vietnam. Fauna & Flora International/Conservation International, Hanoi, Vietnam.

Page completed by: A.P.E.S. Wiki team Date: 19/05/2023

Yok Don National Park

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