Difference between revisions of "Ohosu Forest Reserve"
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= Summary = | = Summary = | ||
| − | <div style="float: right">{{#display_map: height=190px | width=300px | scrollzoom=off | zoom=5 | layers= OpenStreetMap, OpenTopoMap| | + | <div style="float: right">{{#display_map: height=190px | width=300px | scrollzoom=off | zoom=5 | layers= OpenStreetMap, OpenTopoMap|6.807665, 5.223782~[[Ohosu Forest Reserve]]~'Pan troglodytes ellioti''}}</div> |
* Nigeria-Cameroon chimpanzees (''Pan troglodytes ellioti'') are likely absent in Ohosu Forest Reserve. | * Nigeria-Cameroon chimpanzees (''Pan troglodytes ellioti'') are likely absent in Ohosu Forest Reserve. | ||
* The population size is unknown. | * The population size is unknown. | ||
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{| border="1" cellpadding="5" cellspacing="0" class="Site_characteristics-table" | {| border="1" cellpadding="5" cellspacing="0" class="Site_characteristics-table" | ||
|Species | |Species | ||
| − | |Pan troglodytes ellioti | + | |'Pan troglodytes ellioti'' |
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|Area | |Area | ||
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|Coordinates | |Coordinates | ||
| − | |Lat: | + | |Lat: 6.807665 , Lon: 5.223782 |
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|Type of site | |Type of site | ||
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!Species | !Species | ||
!Year | !Year | ||
| + | !Occurrence | ||
| + | !Encounter or vistation rate (nests/km; ind/day) | ||
| + | !Density estimate [ind./ km²] (95% CI) | ||
!Abundance estimate (95% CI) | !Abundance estimate (95% CI) | ||
| − | ! | + | !Survey area |
| − | ! | + | !Sampling method |
| − | ! | + | !Analytical framework |
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!Source | !Source | ||
!Comments | !Comments | ||
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|''Pan troglodytes ellioti'' | |''Pan troglodytes ellioti'' | ||
|2006 | |2006 | ||
| + | | | ||
| + | |0 | ||
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| − | |||
|Ohosu Forest Reserve | |Ohosu Forest Reserve | ||
|Reconnaissance walk | |Reconnaissance walk | ||
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|Greengrass 2006 | |Greengrass 2006 | ||
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!Year of threat | !Year of threat | ||
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| − | | | + | |10 Geological events |
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| + | |Absent | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | |12 Other threat | ||
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| − | | | + | |Absent |
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|2 Agriculture & aquaculture | |2 Agriculture & aquaculture | ||
|2.1 Annual & perennial non-timber crops | |2.1 Annual & perennial non-timber crops | ||
| − | |High | + | |High (more than 70% of population affected) |
|Illegal farming in the reserve (Greengrass 2006). | |Illegal farming in the reserve (Greengrass 2006). | ||
|Ongoing (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 | ||
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|3 Energy production & mining | |3 Energy production & mining | ||
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Latest revision as of 09:56, 18 March 2025
West Africa > Nigeria > Ohosu Forest Reserve
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Summary
- 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 |
Conservation activities
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 |
Research activities
Documented behaviours
Table 7. Behaviours documented for Ohosu Forest Reserve
| Behavior | Source |
|---|---|
| Not reported |
Exposure to climate change impacts
External links
Relevant datasets
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