Danau Sentarum-Betung Kerihun Corridor

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Summary

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• Northwest Bornean orangutans (Pongo pygmaeus pygmaeus) are present in Danau Sentarum-Betung Kerihun Corridor.
• The orangutan population size is unknown.
• The orangutan population trend is unknown.
• The total site area is 9,439.75 km².
• The main reported threats are illegal logging, road development, and land clearing for agriculture plantations.
• The main conservation activities have focused on raising awareness in the community and restoring habitats.

Site characteristics

The Danau Sentarum–Betung Kerihun Corridor is a forested landscape in Kapuas Hulu District, West Kalimantan, Indonesia. It connects two important protected areas: Danau Sentarum National Park, known for its swamp and peat forest, and Betung Kerihun National Park, characterized by upland and hill forests. The corridor itself plays a crucial ecological role in ensuring connectivity between these parks for Northwest Bornean orangutans (Pongo pygmaeus pygmaeus), enabling gene flow and long-range movement across different habitat types. The combined area offers a range of elevation (mostly 0–500 m), slope gradients, and riverine features that support diverse vegetation, making it a suitable habitat for orangutans in various ecological zones (Prayogo et al. 2014).

Table 1. Basic site information for Danau Sentarum-Betung Kerihun Corridor

Species	Pongo pygmaeus pygmaeus
Area	9,439.75 km²
Coordinates	Lat: 1.026443 , Lon: 112.748353
Type of site	Non-protected area (Mixed use conservation activity area)
Habitat types	Subtropical/tropical moist lowland forest
Type of governance

Types of sites Governance types Habitat types

Ape status

Table 2. Ape population estimates reported for Danau Sentarum-Betung Kerihun Corridor

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 pygmaeus

Sampling methods Analytical frameworks

Threats

Table 3. Threats to apes reported for Danau Sentarum-Betung Kerihun Corridor

Category	Specific threats	Threat level	Description	Year of threat
1 Residential & commercial development	1.1 Residential areas	Present (unknown severity)	Orangutans were reportedly seldom present within 0–3,000 meters of villages, and this is due to their closeness to human settlements (Prayogo et al. 2014).	Ongoing (2014)
2 Agriculture & aquaculture	2.1 Annual & perennial non-timber crops	Present (unknown severity)	Certain ares of the site have been converted into agricultural plantations (Prayogo et al. 2014).	Ongoing (2014)
4 Transportation & service corridors	4.1 Roads & railroads	Present (unknown severity)	The presence of road development has been reported, with roads hindering orangutan movement and being linked to illegal logging, noise pollution, and the conversion of forests along their edges (Prayogo et al. 2014).	Ongoing (2014)
5 Biological resource use	5.3 Logging & wood harvesting	Present (unknown severity)	In some forest areas within the site, illegal logging has been reported, leading to major habitat changes that drove orangutans away due to reduced size, degraded quality, and disrupted movement paths (Prayogo et al. 2014).	Ongoing (2014)

Threats

Conservation activities

Table 4. Conservation activities reported for Danau Sentarum-Betung Kerihun Corridor

Category	Specific activity	Description	Implementing organization(s)	Year of activity
4 Education & awareness	Other	Community outreach and capacity building (Sherman et al. 2022).		2011-Ongoing (2022)
5 Protection & restoration	Other	Habitat management activities were reported to be present (Sherman et al. 2022).		2011-Ongoing (2022)

Conservation activities

References

Prayogo, H., Thohari, A. M., Solihin, D. D., Prasetyo, L. B., & Sugardjito, J. (2014). Habitat suitability modeling of Bornean orangutan (Pongo pygmaeus pygmaeus) in Betung Kerihun National Park, Danau Sentarum and corridor, West Kalimantan. Jurnal Manajemen Hutan Tropika (Journal of Tropical Forest Management), 20(2), 112–120. https://doi.org/10.7226/jtfm.20.2.112

Sherman, J., Voigt, M., Ancrenaz, M., Wich, S. A., Qomariah, I. N., Lyman, E., Massingham, E., & Meijaard, E. (2022). Orangutan killing and trade in Indonesia: Wildlife crime, enforcement, and deterrence patterns. Biological Conservation, 276, 109744. https://doi.org/10.1016/j.biocon.2022.109744

Page created by: Aime Mizero Date: 2025-06-02