Chu Yang Sin National Park

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Summary

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• Southern Yellow-cheeked Gibbons (Nomascus gabriellae) are present in Chu Yang Sin National Park.
• It has been estimated that a minimum of 8 groups occur in the site.
• The gibbon population trend is unknown.
• The site has a total size of 669 km².
• Key threats to gibbons are hunting and logging.
• Conservation activities have focused on improving the management of the site, e.g., improvement of law enforcement.

Site characteristics

The site is located in southern Vietnam; it was initially designated as a nature reserve in 1986, and designated as a national park in 2002 (BirdLife International 2023, WDPA). The park encompasses a range of high mountains in the northern part of Da Lat plateau. Endemic bird species have been recorded at the site, the most important of which, from a conservation perspective, are Grey-crowned Crocias Crocias langbianis and Garrulax yersini, which are classified as globally endangered. The site was designated an Important Bird Area in 2002 (BirdLife International 2023).

Table 1. Basic site information for Chu Yang Sin National Park

Area	669 km²
Coordinates	12.407906, 108.434924
Designation	National Park
Habitat types	Subtropical/tropical moist lowland forest, subtropical/tropical moist montane forest

IUCN habitat categories Site designations

Ape status

In 2010, eight groups of southern yellow-cheeked gibbons were recorded in an area of 2,500 ha within the park, documenting the first recent evidence of their presence (Rawson et al. 2011).

Table 2. Ape population estimates in Chu Yang Sin 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	2010		8		2,500 ha	Unknown	Rawson et al. 2011

Threats

Infrastructure development, logging and hunting are key threats to wildlife in this park (Rawson et al. 2011).

Table 3. Threats to apes in Chu Yang Sin National Park

Category	Specific threats	Threat level	Quantified severity	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 level is unknown		An influx of Mong ethnic communities has led to an increase in gun ownership and hunting around the park, however, there are no records of gibbons hunted or traded from this site, although southern yellow-cheeked gibbons are a target species for hunters with guns (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

A GEF project was implemented from 2006-2009 to strengthen management, including wildlife surveys and capacity building of local management agencies. Further support is required for activities which would also assist the conservation of southern yellow-cheeked gibbons, including park expansion and improved management capacity and law enforcement. Gibbon population surveys are needed to further determine the value of the site for gibbon conservation (Rawson et al. 2011).

Table 4. Conservation activities in Chu Yang Sin National Park

Category	Specific activity	Description	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	Not reported
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 Chu Yang Sin National Park

Challenge	Source
Not reported

Research activities

Documented behaviours

Table 6. Ape behaviors reported for Chu Yang Sin National Park

Behavior	Source
Not reported

References

BirdLife International (2023) Important Bird Areas factsheet: Chu Yang Sin. Downloaded from http://www.birdlife.org on 13/02/2023.
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: 10/02/2023