Yoko Council Forest: Difference between revisions
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= Ape status = | = Ape status = | ||
In 2022, a study was conducted to assess the chimpanzee population density and distribution in the site, as well as habitat use, and threats (Kamgang et al. 2023). | In 2022, a study was conducted to assess the chimpanzee population density and distribution in the site, as well as habitat use, and threats ([[#R01958|Kamgang et al. 2023]]). | ||
'''Table 2. Ape population estimates reported for Yoko Council Forest''' | '''Table 2. Ape population estimates reported for Yoko Council Forest''' | ||
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|Full count | |Full count | ||
| | | | ||
|Kamgang et al. 2023 | |[[#R01958|Kamgang et al. 2023]] | ||
|average chimpanzee nest density of 69.3 [95% CI 54.9-86.7] nests/km2 | |average chimpanzee nest density of 69.3 [95% CI 54.9-86.7] nests/km2 | ||
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= Threats = | = Threats = | ||
During a 2022 survey of the area, the signs of human activities were collected, namely poaching signs (traps, shell casings, hunting camps), pastoral transhumance clues (cattle droppings, camps, burning or degraded areas, cattle, and illegal logging) and fishing clues (fishing barriers, fishing camps). The main threats recorded were transhumance (frequency of observation: 75.33%), hunting (13. 66%), logging (8.81%) and fishing (2.2%), which were mainly observed in the south-west sector of the forest (Kamgang et al. 2023). | During a 2022 survey of the area, the signs of human activities were collected, namely poaching signs (traps, shell casings, hunting camps), pastoral transhumance clues (cattle droppings, camps, burning or degraded areas, cattle, and illegal logging) and fishing clues (fishing barriers, fishing camps). The main threats recorded were transhumance (frequency of observation: 75.33%), hunting (13. 66%), logging (8.81%) and fishing (2.2%), which were mainly observed in the south-west sector of the forest ([[#R01958|Kamgang et al. 2023]]). | ||
'''Table 3. Threats to apes reported for Yoko Council Forest''' | '''Table 3. Threats to apes reported for Yoko Council Forest''' | ||
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|2.3 Livestock farming & ranching | |2.3 Livestock farming & ranching | ||
|High (more than 70% of population affected) | |High (more than 70% of population affected) | ||
|Nomadic grazing; occupation of all savannah spaces by herds of cattle, sheep, Mbororo tracks and burns to facilitate the movement of herds and the renewal of pastures (Kamgang et al. 2023). | |Nomadic grazing; occupation of all savannah spaces by herds of cattle, sheep, Mbororo tracks and burns to facilitate the movement of herds and the renewal of pastures ([[#R01958|Kamgang et al. 2023]]). | ||
|Ongoing (2023) | |Ongoing (2023) | ||
|- | |- | ||
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|5.1 Hunting & collecting terrestrial animals | |5.1 Hunting & collecting terrestrial animals | ||
|Medium (30-70% of population affected) | |Medium (30-70% of population affected) | ||
|Traps, shell casings, and hunting camps recorded (Kamgang et al. 2023). | |Traps, shell casings, and hunting camps recorded ([[#R01958|Kamgang et al. 2023]]). | ||
|Ongoing (2023) | |Ongoing (2023) | ||
|- | |- | ||
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|5.3 Logging & wood harvesting | |5.3 Logging & wood harvesting | ||
|Medium (30-70% of population affected) | |Medium (30-70% of population affected) | ||
|Illegal logging (Kamgang et al. 2023). | |Illegal logging ([[#R01958|Kamgang et al. 2023]]). | ||
|Ongoing (2023) | |Ongoing (2023) | ||
|} | |} | ||
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= Research activities = | = Research activities = | ||
A 2022 study by Kamgang et al. (2022) estimated a chimpanzee nest decay rate of 77.3 days, for an estimated abundance of about 113 [95% CI 45-280] chimpanzees in the forest. Chimpanzees were found to be nesting in ''Marantaceae'' forests and swampy forests instead of savannah, mosaics-savannah forests, and galleries forests. 24 nesting tree species of chimpanzees have been recorded with ''Khaya grandifolia'' and ''Uapaca guineensis'' being the most used trees (Kamgang et al. 2023). | A 2022 study by Kamgang et al. (2022) estimated a chimpanzee nest decay rate of 77.3 days, for an estimated abundance of about 113 [95% CI 45-280] chimpanzees in the forest. Chimpanzees were found to be nesting in ''Marantaceae'' forests and swampy forests instead of savannah, mosaics-savannah forests, and galleries forests. 24 nesting tree species of chimpanzees have been recorded with ''Khaya grandifolia'' and ''Uapaca guineensis'' being the most used trees ([[#R01958|Kamgang et al. 2023]]). | ||
= Documented behaviours = | = Documented behaviours = | ||
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= References = | = References = | ||
Kamgang, S. A., Dongmo, E. M., Kirsten, I., Jefferson, P. M. J., Mveimané, A., Bastin, D., ... & Eric-Moise, B. F. (2023). The Chimpanzees (Pan troglodytes) of the Yoko Council Forest in Cameroon: Abundance, Activity Pattern and Threats. Ecology and Evolutionary Biology, 8(2), 38. | <span id="R01958"></span>Kamgang, S. A., Dongmo, E. M., Kirsten, I., Jefferson, P. M. J., Mveimané, A., Bastin, D., ... & Eric-Moise, B. F. (2023). The Chimpanzees (Pan troglodytes) of the Yoko Council Forest in Cameroon: Abundance, Activity Pattern and Threats. Ecology and Evolutionary Biology, 8(2), 38. [https://doi.org/10.11648/j.eeb.20230802.12 doi:10.11648/j.eeb.20230802.12] | ||
'''Page created by: '''Serge Kamgang & APES Atlas Team''' Date:''' 2023-11-02 | '''Page created by: '''Serge Kamgang & APES Atlas Team''' Date:''' 2023-11-02 | ||
Latest revision as of 16:31, 12 October 2026
Central Africa > Cameroon > Yoko Council Forest
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Summary
- chimpanzees (Pan troglodytes) are present in Yoko Council Forest.
- It has been estimated that 113 (CI: 45-280) individuals occur in the site.
- The chimpanzee population trend is unknown.
- The site has a total size of 295 km².
- Key threats to chimpanzees are pastoral transhumance and hunting.
- Conservation activities are not documented.
Site characteristics
Yoko Council forest is located in central Cameroon. The chimpanzees found in the forest may be Pan troglodytes ellioti, but DNA tests have yet to confirm the subspecies (Kamgang pers. comm. 2023). The forest is owned by the council of Yoko, and villages around the council forest should normally benefit from the exploitation of its natural resources. Other endangered species found at the site include giant pangolins, white-bellied pangolins, black-bellied pangolins, and African golden cats (Kamgang pers. comm. 2023).
Table 1. Basic site information for Yoko Council Forest
| Species | Pan troglodytes |
| Area | 295 km² |
| Coordinates | Lat: 5.063443 , Lon: 12.625930 |
| Type of site | Non-protected area (Community Forest) |
| Habitat types | Subtropical/tropical moist lowland forest, Subtropical/tropical swamp forest |
| Type of governance |
Types of sites Governance types Habitat types
Ape status
In 2022, a study was conducted to assess the chimpanzee population density and distribution in the site, as well as habitat use, and threats (Kamgang et al. 2023).
Table 2. Ape population estimates reported for Yoko Council Forest
| 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 | 2022 | 0.38 (0.15-0.94) | 113 (45-280) | Yoko Council Forest | Full count | Kamgang et al. 2023 | average chimpanzee nest density of 69.3 [95% CI 54.9-86.7] nests/km2 |
Sampling methods Analytical frameworks
Threats
During a 2022 survey of the area, the signs of human activities were collected, namely poaching signs (traps, shell casings, hunting camps), pastoral transhumance clues (cattle droppings, camps, burning or degraded areas, cattle, and illegal logging) and fishing clues (fishing barriers, fishing camps). The main threats recorded were transhumance (frequency of observation: 75.33%), hunting (13. 66%), logging (8.81%) and fishing (2.2%), which were mainly observed in the south-west sector of the forest (Kamgang et al. 2023).
Table 3. Threats to apes reported for Yoko Council Forest
| Category | Specific threats | Threat level | Description | Year of threat |
|---|---|---|---|---|
| 2 Agriculture & aquaculture | 2.3 Livestock farming & ranching | High (more than 70% of population affected) | Nomadic grazing; occupation of all savannah spaces by herds of cattle, sheep, Mbororo tracks and burns to facilitate the movement of herds and the renewal of pastures (Kamgang et al. 2023). | Ongoing (2023) |
| 5 Biological resource use | 5.1 Hunting & collecting terrestrial animals | Medium (30-70% of population affected) | Traps, shell casings, and hunting camps recorded (Kamgang et al. 2023). | Ongoing (2023) |
| 5 Biological resource use | 5.3 Logging & wood harvesting | Medium (30-70% of population affected) | Illegal logging (Kamgang et al. 2023). | Ongoing (2023) |
Conservation activities
GIZ (Gesellschaft fur International Zusammenarbeit) program ProFEC- Program Forest, Environment and Climate is working since 2020 in and around the Yoko Council forest. They support the council of Yoko with the elaboration of a management plan for the council forest, which will focus on conservation objectives. The management plan will be aligned with the biomonitoring plan, which is being elaborated by the GIZ for the council forest and validated by the council. Moreover, the same GIZ program is working with the communities around the forest to develop income generating activities (Kamgang pers. comm. 2023).
Challenges
Table 5. Challenges reported for Yoko Council Forest
| Challenges | Specific challenges | Source | Year(s) |
|---|---|---|---|
| Not reported |
Enablers
Table 6. Enablers reported for Yoko Council Forest
| 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
A 2022 study by Kamgang et al. (2022) estimated a chimpanzee nest decay rate of 77.3 days, for an estimated abundance of about 113 [95% CI 45-280] chimpanzees in the forest. Chimpanzees were found to be nesting in Marantaceae forests and swampy forests instead of savannah, mosaics-savannah forests, and galleries forests. 24 nesting tree species of chimpanzees have been recorded with Khaya grandifolia and Uapaca guineensis being the most used trees (Kamgang et al. 2023).
Documented behaviours
Table 7. Behaviours documented for Yoko Council Forest
| Category | Behavior | Observation type | Prevalence | Observation dates | Source | Habituation | Species | Comment |
|---|---|---|---|---|---|---|---|---|
| Not reported |
Exposure to climate change impacts
External links
References
Kamgang, S. A., Dongmo, E. M., Kirsten, I., Jefferson, P. M. J., Mveimané, A., Bastin, D., ... & Eric-Moise, B. F. (2023). The Chimpanzees (Pan troglodytes) of the Yoko Council Forest in Cameroon: Abundance, Activity Pattern and Threats. Ecology and Evolutionary Biology, 8(2), 38. doi:10.11648/j.eeb.20230802.12
Page created by: Serge Kamgang & APES Atlas Team Date: 2023-11-02