Usun Apau National Park
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Summary
- Bornean orangutans (Pongo pygmaeus pygmaeus) are present in Usun Apau National Park.
- The population size is unknown.
- The population trend is unknown.
Site characteristics
Usun Apau National Park is described as pristine area known for its waterfalls. The government aims to develop ecotourism at Usun Apau National Park (Sarawak Tribune 2022). Usun Apau was also proposed to be included in the extension of the Heart of Borneo as part of Extended Baram Complex (Mathai et al. 2016). Other species such as Presbytis hosei and Presbytis rubicunda ignita are found in this national park (Ang et al.2024).
Table 1. Basic site information for Usun Apau National Park
| Species | Pongo pygmaeus |
| Area | 471.22 km² |
| Coordinates | Lat: 2.916324 , Lon: 114.665293 |
| Type of site | Protected area (National Park) |
| Habitat types | Subtropical/tropical moist montane forest, Rocky areas (inland cliffs, mountain peaks) |
| Type of governance | Governance by government |
Types of sites Governance types Habitat types
Ape status
As the site is located near the presumed distribution boundary between P. p. pygmaeus and P. p. morio, the subspecies observed there cannot be determined with certainty (Ampeng et al. 2021).
Table 2. Ape population estimates reported for Usun Apau National Park
| Species | Year | Occurrence | Encounter or vistation rate (nests/km; ind/day) | Density estimate [ind./ km²] (95% CI) | Abundance estimate (95% CI) | Survey area | Sampling method | Analytical framework | Source | Comments | A.P.E.S. database ID |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 'Pongo pygmaeus | 2017-2020 | Absent | Aerial (drones/plane/helicopter) | Ampeng et al. 2021 | Aerial surveys fitted with FLIR-cameras were unable to confirm the presence of additional nests from daytime aerial photographs. | ||||||
| 'Pongo pygmaeus | 2017-2020 | Present | Line transects | Ampeng et al. 2021 | The survey using line transects found one individual Bornean orangutan and 4 orangutan nests. |
Sampling methods Analytical frameworks
Threats
Conservation activities
Challenges
Enablers
Research activities
There was an expedition in Usun Apau Plateau by an Oxford University in 1955 (Arnold 1957). The expedition explored the plateau and also conducted archaelogical excavations from old longhouses.
Documented behaviours
Exposure to climate change impacts
External links
References
Ampeng, A., Liam, J., Simpson, B., Traelholt, C., Md Nor, S., Abdan-Saleman, M. S. B., …, & Md-Zain, B. M. (2021). First Bornean orangutan sighting in Usun Apau National Park, Sarawak. Biodiversity Data Journal, 9. doi:10.3897/bdj.9.e60753
Ang, A., Brandon-Jones, D., Ruppert, N., Lee, Z. H., Affendi, A., Stanly Anyie, Y., Boonratana, R., Cheyne, S. M., Chua, A., Hayunieta, Irawan, A., Jerusalinsky, L., Karuniawati, A., Khalid, S., Koh, J., Lee, C., Lhota, S., Lwin, N., Mittermeier, R. A., … Roos, C. (2024). Asian langurs (Presbytis) conservation action plan 2024–2034. IUCN. https://portals.iucn.org/library/node/51546
Mathai, J., Duckworth, J. W., Meijaard, E., Fredriksson, G., Hon, J., Sebastian, A., … Wilting, A. (2016). Carnivore conservation planning on Borneo: Identifying key carnivore landscapes, research priorities and conservation interventions. Raffles Bulletin of Zoology.
Sarawak Tribune. (2022). Government to develop Usun Apau as tourist attraction. https://www.newsarawaktribune.com.my/government-to-develop-usun-apau-as-tourist-attraction/ link
Page created by: Cristiar Samosir Date: 2024-11-26 13:43:00
Page updated by: APES Atlas team Date: 2026-03-16