Ohosu Forest Reserve

West Africa > Nigeria > Ohosu Forest Reserve

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Summary

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• Nigeria-Cameroon chimpanzees (Pan troglodytes ellioti) are likely absent in Ohosu Forest Reserve.
• The population size is unknown.
• The chimpanzee population trend is decreasing (likely extinct).
• The site has a total size of 471 km².
• Key threats to chimpanzees are habitat degradation due to logging and farming.
• Conservation activities are not documented.

Site characteristics

Ohosu Forest Reserve is located in Edo State, bordering both Akure-Ofosu and Idanre Forest Reserves in Ondo State. The Lagos-Benin expressway lies close to its southern border (Greengrass 2006).

Table 1. Basic site information for Ohosu Forest Reserve

Species	Pan troglodytes ellioti
Area	471 km²
Coordinates	Lat: 6.807665 , Lon: 5.223782
Type of site	Protected area (Forest Reserve)
Habitat types	Subtropical/tropical heavily degraded former forest, Subtropical/tropical moist lowland forest
Type of governance

Types of sites Governance types Habitat types

Ape status

Based on a 2006 survey, it is likely that chimpanzees have gone extinct in the reserve. Local people reported that large-scale logging activity in the reserve caused chimpanzees to migrate north into Ondo state. One man reported not seeing chimpanzees since the early 90s (Greengrass 2006).

Table 2. Ape population estimates reported for Ohosu Forest 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
Pan troglodytes ellioti	2006		0			Ohosu Forest Reserve	Reconnaissance walk		Greengrass 2006

Sampling methods Analytical frameworks

Threats

Timber exploitation was intense in this reserve, and there have also been many illegal farm settlements in the site.

Table 3. Threats to apes reported for Ohosu Forest Reserve

Category	Specific threats	Threat level	Description	Year of threat
2 Agriculture & aquaculture	2.1 Annual & perennial non-timber crops	High (more than 70% of population affected)	Illegal farming in the reserve (Greengrass 2006).	Ongoing (2006)
5 Biological resource use	5.3 Logging & wood harvesting	High (more than 70% of population affected)	Timber exploitation that was reported as early as 1982 (Greengrass 2006).	Ongoing (2006)

Threats

Challenges

Table 5. Challenges reported for Ohosu Forest Reserve

Challenges	Specific challenges	Source	Year(s)
	Not reported

Challenges

Enablers

Table 6. Enablers reported for Ohosu Forest Reserve

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

Enablers

Documented behaviours

Table 7. Behaviours documented for Ohosu Forest Reserve

Category	Behavior	Observation type	Prevalence	Observation dates	Source	Habituation	Species	Comment
	Not reported

Behaviours

References

Greengrass, E.J. (2006). A survey of chimpanzees in south-west Nigeria. Report to the NCF-WCS Biodiversity Research Programme.

Page created by: APES Atlas Team Date: 2023-03-13