Summary

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Sumatran orangutans (Pongo abelii) are present in Siranggas Wildlife Reserve.
The orangutan population size is unknown.
The orangutan population trend is unknown.
The total site area is 56.57 km².
The main threat was reported to be the conversion of forests into farmland.
The main conservation activity is the mapping and enforcing boundaries of the protected site.

Site characteristics

Table 1. Basic site information for Siranggas Wildlife Reserve

Species	Pongo abelii
Area	56.57 km²
Coordinates	Lat: 2.598600 , Lon: 98.216400
Type of site	Protected area (Wildlife Reserve)
Habitat types	Subtropical/tropical moist lowland forest
Type of governance	Governance by government

Types of sites Governance types Habitat types

Ape status

Table 2. Ape population estimates reported for Siranggas Wildlife Reserve

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 abelii

Sampling methods Analytical frameworks

Threats

Table 3. Threats to apes reported for Siranggas Wildlife Reserve

Category	Specific threats	Threat level	Description	Year of threat
2 Agriculture & aquaculture	2.1 Annual & perennial non-timber crops	Present (unknown severity)	Transforming forested areas into agricultural land under the initiative known as the food estate program (Jong 2021).	1980-Ongoing (2025)

Threats

Conservation activities

Table 4. Conservation activities reported for Siranggas Wildlife Reserve

Category	Specific activity	Description	Implementing organization(s)	Year of activity
5 Protection & restoration	5.5 Demarcate and enforce boundaries of protected areas	The site boundaries and the food estate program area were mapped to ensure that the program does not encroach upon protected forests or other conservation areas (Jong 2021).	Ministry of Environment and Forestry	Ongoing (2021)

Conservation activities

Challenges

Enablers

Research activities

Documented behaviours

Exposure to climate change impacts

External links

References

Jong, H. N. (2021, January 6). Indonesia’s plantation program on collision course with wildlife, Indigenous groups. Mongabay. Retrieved June 16, 2025, from https://news.mongabay.com/2021/01/indonesia-food-estate-program-wildlife-indigenous-groups/

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

Page created by: Aime Mizero Date: 2025-06-16