Yoyo River Forest Reserve

West Africa > Ghana > Yoyo River Forest Reserve

Summary

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• Western chimpanzees (Pan troglodytes verus) are present in Yoyo River Forest Reserve.
• No chimpanzees were recorded in the last survey.
• The chimpanzee population trend is decreasing.
• The site has a total size of 236 km².
• Key threats to chimpanzees are hunting and logging.
• Conservation activities are not documented.

Site characteristics

Yoyo River Forest Reserve is located in southwestern Ghana, north of the town Enchi. The reserve is contiguous with Tano-Anwia and Tano-Ehuro Forest Reserves. Yoyo is also connected to Boin River Forest Reserve by a narrow strip of forest (BirdLife International 2022). The reserve was created in 1932 (Gatti 2009). The area is drained by the Yoyo river and several other streams whose valleys become swampy during the wet season (BirdLife International 2022). The site has been an Important Bird Area since 2001 (BirdLife International 2022).

Table 1. Basic site information for Yoyo River Forest Reserve

Area	236 km²
Coordinates	5.960077 N, -2.795357 W
Designation	Forest Reserve
Habitat types	Subtropical/tropical moist lowland forest

IUCN habitat categories Site designations

Ape status

A rapid survey was conducted at the site in 2009 in the context of the Wildlife Wood Project in Ghana, which aims to assist logging companies in improving wildlife management in concession areas (Gatti 2009). No signs of chimpanzees were recorded.

Table 2. Ape population estimates in Yoyo River Forest Reserve

Species	Year	Abundance estimate (95% CI)	Density estimate [ind./ km²] (95% CI)	Encounter rate (nests/km)	Area	Method	Source	Comments	A.P.E.S. database ID
Pan troglodytes verus	2009			0	Yoyo River Forest Reserve	Index survey (reconnaissance walk) and camera trap survey	Gatti 2009	survey effort: 22.63 km

Threats

Table 3. Threats to apes in Yoyo River Forest Reserve

Category	Specific threats	Threat level	Quantified severity	Description	Year of threat
1. Residential & commercial development		Unknown
2. Agriculture & aquaculture		Unknown
3. Energy production & mining		Unknown
4. Transportation & service corridors		Unknown
5. Biological resource use	5.1 Hunting & collecting terrestrial animals	High	5.214 hunting signs/km recorded in a 2009 survey (Gatti 2009).	High hunting pressure (Gatti 2009).	Ongoing (2009)
	5.3 Logging & wood harvesting	Unknown whether the threat category is present		The reserve was formerly under two timber concessions and the eastern and western parts were logged between 1962 and 1979 (BirdLife International 2022). Concessions within the reserve were acquired by SAX in 1993, and logging has taken place in selected compartments at least as early as 1999 (Gatti 2009).	Unknown
6. Human intrusion & disturbance		Unknown
7. Natural system modifications		Unknown
8. Invasive & other problematic species, genes, diseases		Unknown
9. Pollution		Unknown
10. Geological Events		Absent
11. Climate change & severe weather		Unknown
12. Other options		Absent

IUCN Threats list

Conservation activities

Table 4. Conservation activities in Yoyo River Forest Reserve

Category	Specific activity	Description	Year of activity
1. Residential & commercial development	Not reported
2. Agriculture & aquaculture	Not reported
3. Energy production & mining	Not reported
4. Transportation & service corridors	Not reported
5. Biological resource use	Not reported
6. Human intrusion & disturbance	Not reported
7. Natural system modifications	Not reported
8. Invasive & other problematic species, genes, diseases	Not reported
9. Pollution	Not reported
10. Education & Awareness	Not reported
11. Habitat Protection	Not reported
12. Species Management	Not reported
13. Livelihood; Economic & Other Incentives	Not reported

Conservation activities list (Junker et al. 2017)

Challenges

Table 5. Challenges reported for Yoyo River Forest Reserve

Challenge	Source
Not reported

Research activities

Documented behaviours

Table 6. Ape behaviors reported for Yoyo River Forest Reserve

Behavior	Source
Not reported

References

BirdLife International (2022) Important Bird Areas factsheet: Yoyo River Forest Reserve. Downloaded from http://www.birdlife.org on 15/03/2022.
Gatti, S. (2009). Mammal surveys and capacity building for the Wildlife Wood Project - Ghana. Unpublished report to the WWP-Ghana.

Page completed by: A.P.E.S. Wiki team Date: 18/03/2022