Ohosu Forest Reserve

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West Africa > Nigeria > Ohosu Forest Reserve

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

Area 471 km²
Coordinates
Designation Forest Reserve
Habitat types subtropical/tropical heavily degraded forest, subtropical/tropical moist lowland forest

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 in Ohosu 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 ellioti 2006 0 Ohosu Forest Reserve Index survey (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 in Ohosu Forest Reserve

Category Specific threats Threat level Quantified severity Description Year of threat
1. Residential & commercial development Unknown
2. Agriculture & aquaculture 2.1 Annual & perennial non-timber crops High Illegal farming in the reserve (Greengrass 2006). Ongoing (2006)
3. Energy production & mining Unknown
4. Transportation & service corridors Unknown
5. Biological resource use 5.3 Logging & wood harvesting High Timber exploitation that was reported as early as 1982 (Greengrass 2006). Ongoing (2006)
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 Ohosu 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 Ohosu Forest Reserve

Challenge Source
Not reported

Research activities

Documented behaviours

Table 6. Ape behaviors reported for Ohosu Forest Reserve

Behavior Source
Not reported

External links

References

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


Page completed by: A.P.E.S. Wiki team Date: 13/03/2023