Ben En National Park

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Summary

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• Northern white-cheeked gibbons (Nomascus leucogenys) may be present in Ben En National Park.
• The population size is unknown.
• The population trend is decreasing.
• The site has a total size of 147.4 km².
• Logging is the main threat to gibbons in the area.
• Conservation activities are not documented.

Site characteristics

Ben En National Park was established as a national park in 1992. The site includes a wide and diverse system of lakes, caves, mountains and forest that is utilized to develop ecotourism. Ben En River and Muc River are the two biggest rivers there (Frontier Vietnam 2000).

Table 1. Basic site information for Ben En National Park

Species	'Nomascus leucogenys
Area	147.4 km²
Coordinates	Lat: 19.566729 , Lon: 105.452144
Type of site	Protected area (National Park)
Habitat types	Subtropical/tropical moist lowland forest
Type of governance

IUCN habitat categories Site designations

Ape status

Information from park staff in 2009 suggests only one gibbon group remains and that 2-3 groups are situated outside the park boundary. Before that, gibbons were last recorded in 1997-1998; all sightings and vocalizations may have been of the same group (Rawson et al. 2011).

Table 2. Ape population estimates reported for Ben En 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	NA	NA
Nomascus leucogenys	2009			1		Ben En National Park	Interviews		Rawson et al. 2011

Threats

Table 3. Threats to apes reported for Ben En National Park

Category	Specific threats	Threat level	Description	Year of threat
10 Geological events		Absent
12 Other threat		Absent
5 Biological resource use	5.3 Logging & wood harvesting	High (more than 70% of population affected)	Extensive commercial logging occurred in the park until 1992 and since then, small-scale illegal logging has continued (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

Conservation activities

Table 4. Conservation activities reported for Ben En National Park

Category	Specific activity	Description	Implementing organization(s)	Year of activity
5 Protection & restoration	5.2 Legally protect ape habitat	The site is a national park.		Ongoing (2023)

Conservation activities list (Junker et al. 2017)

Challenges

Table 5. Challenges reported for Ben En National Park

Challenges	Specific challenges	Source	Year(s)
	Not reported

Enablers

Table 6. Enablers reported for Ben En National Park

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 Ben En National Park

Behavior	Source
Not reported

References

Frontier Vietnam (2000) Tordoff, A., Fanning, E. & Grindley, M. (eds) Ben En National Park: A Biodiversity Survey. Frontier Vietnam Environmental Research Report 18. Society for Environmental Exploration, UK and Institute of Ecology and Biological Resources, Hanoi and Darwin Initiative.

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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