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

IUCN habitat categories Site designations

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

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
10 Geological events		Absent
12 Other threat		Absent
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)
1 Residential & commercial development		Unknown
3 Energy production & mining		Unknown
4 Transportation & service corridors		Unknown
6 Human intrusions & disturbance		Unknown
7 Natural system modifications		Unknown
8 Invasive & other problematic species, genes & diseases		Unknown
9 Pollution		Unknown
11 Climate change & severe weather		Unknown

IUCN Threats list

Challenges

Table 5. Challenges reported for Ohosu Forest Reserve

Challenges	Specific challenges	Source	Year(s)
	Not reported

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

Documented behaviours

Table 7. Behaviours documented for Ohosu Forest Reserve

Behavior	Source
Not reported

References

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

Page created by: A.P.E.S. Wiki team Date: NA