Huong Son Forest

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Summary

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• Northern white-cheeked gibbons (Nomascus leucogenys) are present in Huong Son Forest.
• It has been estimated that a minimum of 3 groups occur in the site.
• The gibbon population trend is unknown.
• The site has a total size of 300 km².
• Key threats to gibbons are hunting and logging.
• Conservation activities are not documented.

Site characteristics

The site is located in north-central Vietnam, in the province of Ha Tinh. Part of the site is managed by the Huong Son State Forest Company, and the other part is designated as the ‘Ngan Pho River Protection Forest’ (Rawson et al. 2011).

Table 1. Basic site information for Huong Son Forest

Species	'Nomascus leucogenys
Area	300 km²
Coordinates	Lat: 18.522052 , Lon: 105.244000
Type of site	Logging concession
Habitat types	Agricultural land, Subtropical/tropical moist lowland forest
Type of governance

IUCN habitat categories Site designations

Ape status

A 2011 survey confirmed at least three gibbon groups in Son Kim 2 Commune and one group in Song Hon Commune, and according to interviews, a few groups are found in the border area with Laos. In the late 1990s and early 2000s gibbons were recorded on several occasions (Rawson et al. 2011).

Table 2. Ape population estimates reported for Huong Son Forest

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	NA	NA
Nomascus leucogenys	2011			3		Huong Son Forest	Unknown		Nguyen Manh Ha et al. 2011

Threats

In 2010, Hương Sơn had 74.6kha of natural forest, extending over 76% of its land area. In 2021, it lost 679ha of natural forest, equivalent to 352kt of CO₂ emissions (Global Forest Watch).

Table 3. Threats to apes reported for Huong Son Forest

Category	Specific threats	Threat level	Description	Year of threat
10 Geological events		Absent
12 Other threat		Absent
5 Biological resource use	5.1 Hunting & collecting terrestrial animals	High (more than 70% of population affected)	Hunting and capturing.	Ongoing (2011)
5 Biological resource use	5.3 Logging & wood harvesting	High (more than 70% of population affected)	Extensive commercial logging and illegal logging (Rawson et al. 2011).	Ongoing (2011)
1 Residential & commercial development		Unknown
2 Agriculture & aquaculture		Unknown
3 Energy production & mining		Unknown
4 Transportation & service corridors		Unknown
6 Human intrusions & disturbance		Unknown
7 Natural system modifications		Unknown
8 Invasive & other problematic species, genes & diseases		Unknown
9 Pollution		Unknown
11 Climate change & severe weather		Unknown

IUCN Threats list

Challenges

Table 5. Challenges reported for Huong Son Forest

Challenges	Specific challenges	Source	Year(s)
	Not reported

Enablers

Table 6. Enablers reported for Huong Son Forest

Enablers	Specific enablers	Source	Year(s)
1 Site management
2 Resources and capacity
3 Engaged community
4 Institutional support
5 Ecological context
6 Safety and stability

Documented behaviours

Table 7. Behaviours documented for Huong Son Forest

Behavior	Source
Not reported

References

Nguyen Manh Ha, Do Tuoc, and Le Van Dung (2011). [Survey of white-cheeked gibbons (Nomascus leucogenys) in Vu Quang National Park and Huong Son Forestry Company, Ha Tinh]. Centre for Natural Resources and Environmental Studies (CRES), Hanoi, Vietnam (in Vietnamese).

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.

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