Shasha Forest Reserve: Difference between revisions
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Revision as of 04:17, 31 October 2025
West Africa > Nigeria > Shasha Forest Reserve
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Summary
- Nigeria-Cameroon chimpanzees (Pan troglodytes ellioti) might be present in Shasha Forest Reserve.
- The population size is unknown.
- The chimpanzee population trend is decreasing.
- The site has a total size of 90 km².
- Key threats to chimpanzees are logging
- Conservation activities are not documented.
- Part of the reserve was de-gazetted for oil palm plantations and cocoa farms.
Site characteristics
Shasha Forest Reserve is located in the state of Osun, Nigeria. The site is contiguous with Omo Forest to the south. Originally 120 km2, 30 km2 in the northern portion of the reserve were de-gazetted for oil palm plantations and cocoa farms (Greengrass 2006).
Table 1. Basic site information for Shasha Forest Reserve
| Species | Pan troglodytes ellioti |
| Area | 90 km² |
| Coordinates | Lat: 7.088701 , Lon: 4.418837 |
| Type of site | Protected area (Forest Reserve) |
| Habitat types | Agricultural land, Subtropical/tropical heavily degraded former forest |
| Type of governance |
Types of sites Governance types Habitat types
Ape status
A 2006 survey did not find any direct or indirect evidence of chimpanzees occurring in the site. Chimpanzees have not been directly observed in several years, and due to increasing logging and habitat disturbance, the population is likely to be decreasing or already extinct (Greengrass 2006).
Table 2. Ape population estimates reported for Shasha 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 | Shasha Forest Reserve | Reconnaissance walk | Greengrass 2006 |
Sampling methods Analytical frameworks
Threats
The main threat to wildlife in the reserve is illegal, uncontrolled logging (Greengrass 2006).
Table 3. Threats to apes reported for Shasha 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) | Part of the reserve was de-gazetted and converted into oil palm plantations and cocoa farms (Greengrass 2006). | Ongoing (2006) |
| 5 Biological resource use | 5.3 Logging & wood harvesting | High (more than 70% of population affected) | Habitat loss due to illegal logging (Greengrass 2006). | Ongoing (2006) |
Conservation activities
Challenges
Table 5. Challenges reported for Shasha Forest Reserve
| Challenges | Specific challenges | Source | Year(s) |
|---|---|---|---|
| Not reported |
Enablers
Table 6. Enablers reported for Shasha 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 |
Research activities
Documented behaviours
Table 7. Behaviours documented for Shasha Forest Reserve
| Category | Behavior | Observation type | Prevalence | Observation dates | Source | Habituation | Species | Comment |
|---|---|---|---|---|---|---|---|---|
| Not reported |
Exposure to climate change impacts
Table 8. Estimated past and projected climatological characteristics in Shasha Forest Reserve
| Value | 1981-2010 | 2021-2050, RCP 2.6 | 2021-2050, RCP 6.0 | 2071-2099, RCP 2.6 | 2071-2099, RCP 6.0 |
|---|---|---|---|---|---|
| Mean temperature [C] | 27.1 | 28.2 | 28.1 | 28.4 | 29.4 |
| Annual precipitation [mm] | 1528 | 1561 | 1587 | 1548 | 1625 |
| Max no. consecutive dry days (per year) | 43.1 | 43.1 | 42.3 | 42 | 44.2 |
| No. days with heavy precipitation (per year) | 5.3 | 9 | 9.2 | 9.1 | 10.6 |
Table 9. Projected exposure of apes to extreme climate impact events in Shasha Forest Reserve
| Type | No. of years with event (2021-2050, RCP 2.6) | % of site exposed (2021-2050, RCP 2.6) | No. of years with event (2021-2050, RCP 6.0) | % of site exposed (2021-2050, RCP 6.0) | No. of years with event (2070-2099, RCP 2.6) | % of site exposed (2070-2099, RCP 2.6) | No. of years with event (2070-2099, RCP 6.0) | % of site exposed (2070-2099, RCP 6.0) |
|---|---|---|---|---|---|---|---|---|
| Crop failure | 5 | 1.73 | 3.5 | 2.05 | 3 | 2.37 | 10 | 4.35 |
| Drought | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Heatwave | 6.5 | 100 | 9.5 | 100 | 7.5 | 100 | 11 | 100 |
| River flood | 0.25 | 0.15 | 1 | 0.99 | 0.25 | 0.11 | 1 | 1.02 |
| Tropical cyclone | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wildfire | 30 | 0.53 | 30 | 0.53 | 29 | 0.52 | 29 | 0.54 |
External links
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: 2023-03-07