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<div style='float: right'>{{#display_map: height=190px | width=300px | scrollzoom=off | zoom=5 | layers=OpenStreetMap,OpenTopoMap|6.252, 5.268~[[Okomu National Park]]~''Pan troglodytes ellioti''}}</div>
<div style='float: right'>{{#display_map: height=190px | width=300px | scrollzoom=off | zoom=5 | layers=OpenStreetMap,OpenTopoMap|6.252, 5.268~[[Okomu National Park]]~''Pan troglodytes ellioti''}}</div>
* Nigeria-Cameroon chimpanzee (''Pan troglodytes ellioti'') are present in Okomu National Park.
* Nigeria-Cameroon chimpanzees (''Pan troglodytes ellioti'') are likely absent in Okomu National Park.
* The population size is unknown.
* The population has likely been extirpated.
* The population trend is unknown.
* The site has a total size of 224 km².
* The site has a total size of 6,731 km².
* Key threats to chimpanzees are poaching and habitat loss due to logging and agriculture.
* Key threats to chimpanzees are logging, expansion of land for plantations, and human encroachment.
* Conservation activities at the site include patrols, habitat protection and education in local communities.
* Conservation activities at the site have not been documented.
 
 




<div><ul> <li style="display: inline-block;">[[File: photo_2026-06-12_15-40-58.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-03.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-06.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-15.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-25.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-30.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]</ul></div>
= Site characteristics =


= Site characteristics =
Located in southwestern Nigeria, the site was upgraded from wildlife sanctuary to national park in 1999 ([[#R01469|Nwankwo & Halilu 2016]]). . The vegetation of Okomu National Park is mostly lowland rainforest and supports a rich diversity of species including one of Nigeria’s last populations of critically endangered forest elephant, white-bellied pangolin, leopard, and forest buffalo. Chimpanzees have not been detected in the park for over 20 years.  Other important species include the white-throated guenon monkey, red-capped mangabey monkey, yellow-crested hornbill, and West Africa’s largest population of African grey parrots. However, the park has been plagued by illegal logging, unsustainable slash-and-burn agriculture, and insecurity in the park’s riverine southern areas bordering the Niger Delta. Other threats include expanding oil palm, rubber, and cocoa plantations, and bushmeat poaching. ANI Foundation signed a 30-year Partnership Agreement with the National Park Service (NPS) to co-manage Okomu National Park in 2022 ([[#R01468|ANI 2025]]).


Located in southwestern Nigeria, the site was upgraded from wildlife sanctuary to national park in 1999 (Nwankwo & Halilu 2020).


'''Table 1. Basic site information for Okomu National Park'''
'''Table 1. Basic site information for Okomu National Park'''
Line 28: Line 26:
|-
|-
|Area
|Area
|6,731km²
|224 km²
|-
|-
|Coordinates
|Coordinates
Line 37: Line 35:
|-
|-
|Habitat types
|Habitat types
|Subtropical/tropical moist lowland forest, Shrubland
|Subtropical/tropical moist lowland forest, Subtropical/tropical heavily degraded former forest
|-
|-
|Type of governance
|Type of governance
|
|Shared governance
|}
|}


[[Types of sites]] [[Governance types]] [[Habitat types]]  
[[Types of sites]] [[Governance types]] [[Habitat types]]  
= Ape status =
= Ape status =


 
Chimpanzees have no been seen at the site in the last few decades. Annual camera trap surveys conducted by ANI since 2023 have not captured chimpanzees (Morakinyo pers. comm. 2026).


'''Table 2. Ape population estimates reported for Okomu National Park'''
'''Table 2. Ape population estimates reported for Okomu National Park'''
Line 64: Line 63:
|-
|-
|''Pan troglodytes ellioti''
|''Pan troglodytes ellioti''
|2026
|Absent
|
|
|
|Okomu National Park
|Camera trap
|
|Morakinyo pers. comm. 2026
|
|
|
|
|-
|''Pan troglodytes ellioti''
|2025
|Absent
|
|
|
|
|
|
|Okomu National Park
|Okomu National Park
|Camera trap
|
|
|Morakinyo pers. comm. 2026
|
|
|
|
|-
|''Pan troglodytes ellioti''
|2024
|Absent
|
|
|
|Okomu National Park
|Camera trap
|
|Morakinyo pers. comm. 2026
|
|
|-
|''Pan troglodytes ellioti''
|2023
|Absent
|
|
|
|Okomu National Park
|Camera trap
|
|Morakinyo pers. comm. 2026
|
|
|
|
Line 78: Line 116:


[[Sampling methods]] [[Analytical frameworks]]  
[[Sampling methods]] [[Analytical frameworks]]  
= Threats =
= Threats =


Large-scale illegal logging (which has been going on since the 1950s) and the expansion of large rubber and oil-palm plantations nearby are the biggest threats to the park. About 50,000 people in 45 villages live in and around the park, and the population is increasing. Many are recent immigrants attracted by possibilities of employment in the timber and plantation industries, or by farming and hunting opportunities (BirdLife International 2020).
 
 
'''Table 3. Threats to apes reported for Okomu National Park'''
{| border="1" cellpadding="5" cellspacing="0" class="Threats-table"
!Category
!Specific threats
!Threat level
!Description
!Year of threat
|-
|2 Agriculture & aquaculture
|2.1.1 Shifting agriculture
|Medium (30-70% of population affected)
|[[#R01468|ANI 2025]]
|2022-Ongoing (2026)
|-
|4 Transportation & service corridors
|4.1 Roads & railroads
|Low (up to 30% of population affected)
|[[#R01468|ANI 2025]]
|2022-Ongoing (2026)
|-
|5 Biological resource use
|5.1.1 Subsistence bushmeat hunting
|High (more than 70% of population affected)
|[[#R01468|ANI 2025]]
|2022-Ongoing (2026)
|-
|5 Biological resource use
|5.1.3 Commercial bushmeat trade
|High (more than 70% of population affected)
|Driven by commerce ([[#R01468|ANI 2025]], Morakinyo pers. comm. 2026).
|2022-Ongoing (2026)
|-
|5 Biological resource use
|5.3.1 Subsistence logging
|High (more than 70% of population affected)
|Driven by commerce, not large-scale operations ([[#R01468|ANI 2025]], Morakinyo pers. comm. 2026).
|2022-Ongoing (2026)
|-
|6 Human intrusions & disturbance
|6.2 War, civil unrest & military exercises
|Medium (30-70% of population affected)
|Threat to rangers conducting patrols ([[#R01468|ANI 2025]]).
|2022-Ongoing (2026)
|-
|8 Invasive & other problematic species, genes & diseases
|8.1 Invasive non-native/alien species
|Low (up to 30% of population affected)
|[[#R01468|ANI 2025]]
|2022-Ongoing (2026)
|}
 
[[Threats]]


= Conservation activities =
= Conservation activities =


Conservation activities implemented under the National Park Service-ANI Foundation co-management agreement includes ranger patrols to counter illegal activities, as well as habitat protection and restoration, education, and livelihoods incentive programmes for local communities.


'''Table 4. Conservation activities reported for Okomu National Park'''
{| border="1" cellpadding="5" cellspacing="0" class="Conservation_activities-table"
!Category
!Specific activity
!Description
!Implementing organization(s)
!Year of activity
|-
|2 Counter-wildlife crime
|2.3 Conduct regular anti-poaching patrols
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.6 Regularly de-activate/remove ground snares
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.7 Provide better equipment (e.g., guns) to anti-poaching ranger patrols
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.8 Provide training to anti-poaching ranger patrols
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.11 Implement monitoring surveillance strategies (e.g., SMART) or use monitoring data to improve effectiveness of wildlife law enforcement patrols
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.12 Implement community control of patrolling, banning hunting and removing snares
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.13 Provide sustainable alternative livelihoods; establish fish- or domestic meat farms
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|2 Counter-wildlife crime
|2.14 Employ hunters in the conservation sector to reduce their impact
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|4 Education & awareness
|4.1 Educate local communities about apes and sustainable use
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|4 Education & awareness
|4.2 Involve local community in ape research and conservation management
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|4 Education & awareness
|4.4 Regularly play TV & radio announcements to raise ape conservation awareness
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|4 Education & awareness
|4.5 Implement multimedia campaigns using theatre, film, print media, discussions
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|4 Education & awareness
|4.6 Integrate religion/local taboos into conservation education
|Implemented through environmental education outreach activities in local schools (Morakinyo pers. comm. 2026, [[#R01468|ANI 2025]]).
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|5 Protection & restoration
|5.1 Create buffer zones around protected ape habitat
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|5 Protection & restoration
|5.2 Legally protect ape habitat
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|1999-Ongoing (2026)
|-
|5 Protection & restoration
|5.5 Demarcate and enforce boundaries of protected areas
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|5 Protection & restoration
|5.6 Habitat restoration
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|5 Protection & restoration
|5.8 Restrict number of people that are allowed access to site
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|5 Protection & restoration
|5.9 Resettle illegal human communities (i.e., in a protected area) to another location
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|7 Economic & other incentives
|7.1 Provide monetary benefits to local communities for sustainably managing their forest and its wildlife (e.g., REDD, alternative income, employment)
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|-
|7 Economic & other incentives
|7.2 Provide non-monetary benefits to local communities for sustainably managing their forest and its wildlife (e.g., better education, infrastructure development)
|[[#R01468|ANI 2025]]
|Africa Nature Investors (ANI), National Park Service
|2022-Ongoing (2026)
|}


[[Conservation activities]]
<div><ul> <li style="display: inline-block;">[[File: photo_2026-06-12_15-41-11.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-18.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-22.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]<li style="display: inline-block;"> [[File: photo_2026-06-12_15-41-34.jpg | 300px | thumb| none | © ANI Foundation & Jack Devlin]]</ul></div>
= Challenges =
= Challenges =


Line 97: Line 326:
!Year(s)
!Year(s)
|-
|-
|
|1 Site management
|Not reported
|1.1 Need for improved leadership
|
|[[#R01468|ANI 2025]]
|
|Ongoing (2026)
|-
|1 Site management
|1.2 Need for improved coordination
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|1 Site management
|1.3 Corruption
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|1 Site management
|1.4 Conflict on land tenure
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.1 Lack of capacity/training
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.2 Lack of staff
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.3 General lack of funding
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.4 Lack of continuous/long-term funding
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.5 Lack of equipment
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.6 Lack of biomonitoring/survey data
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.7 Lack of infrastructure
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|2 Resources and capacity
|2.8 Lack of evidence of conservation effectiveness
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|3 Engaged community
|3.1 General lack of community engagement or support
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|3 Engaged community
|3.2 Lack of youth engagement
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|3 Engaged community
|3.3 Lack of volunteers
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|3 Engaged community
|3.4 Eroding taboos in favor of conservation
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|3 Engaged community
|3.5 Anticipated disadvantages/costs created by conservation activities (e.g., restricted access/ resource use)
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|4 Institutional support
|4.1 Lack of law enforcement
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|4 Institutional support
|4.2 Lack of government support
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|4 Institutional support
|4.4 Lack of transboundary cooperation
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|5 Ecological context
|5.1 Ecological constraints (e.g., susceptibility to climate change, difficult terrain)
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|6 Safety and stability
|6.1 Political/economic instability
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|-
|6 Safety and stability
|6.2 Insecurity
|[[#R01468|ANI 2025]]
|Ongoing (2026)
|}
|}


[[Challenges]]  
[[Challenges]]  
= Enablers =
= Enablers =


Line 147: Line 487:


[[Enablers]]  
[[Enablers]]  
= Research activities =
= Research activities =




Line 179: Line 521:


[[Behaviours]]  
[[Behaviours]]  
= Exposure to climate change impacts =
= Exposure to climate change impacts =


As part of a study on the exposure of African great ape sites to climate change impacts, Kiribou et al. subm. extracted climate data and data on projected extreme climate impact events for the site. Climatological characteristics were derived from observation-based climate data provided by the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP, www.isimip.org). Parameters were calculated as the average across each 30-year period. For 1981-2010, the EWEMBI dataset from ISIMIP2a was used. For the two future periods (2021-2050 and 2071-2099) ISIMIP2b climate data based on four CMIP5 global climate models were used. For future projections, two Representative Concentration Pathways (RCP) were used. RCP 2.6 is a scenario with strong mitigation measures in which global temperatures would likely rise below 2C. RCP 6.0 is a scenario with medium emissions in which global temperatures would likely rise up to 3C by 2100. For the number of days with heavy precipitation events, the 98th percentile of all precipitation days (>1mm/d) was calculated for the 1979-2013 reference period as a threshold for a heavy precipitation event. Then, for each year, the number of days above that threshold was derived. The figures on temperature and precipitation anomaly show the deviation from the mean temperature and mean precipitation for the 1979-2013 reference period.
As part of a study on the exposure of African great ape sites to climate change impacts, [[#R02295|Kiribou et al. (2024)]] extracted climate data and data on projected extreme climate impact events for the site. Climatological characteristics were derived from observation-based climate data provided by the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP, www.isimip.org). Parameters were calculated as the average across each 30-year period. For 1981-2010, the EWEMBI dataset from ISIMIP2a was used. For the two future periods (2021-2050 and 2071-2099) ISIMIP2b climate data based on four CMIP5 global climate models were used. For future projections, two Representative Concentration Pathways (RCP) were used. RCP 2.6 is a scenario with strong mitigation measures in which global temperatures would likely rise below 2C. RCP 6.0 is a scenario with medium emissions in which global temperatures would likely rise up to 3C by 2100. For the number of days with heavy precipitation events, the 98th percentile of all precipitation days (>1mm/d) was calculated for the 1979-2013 reference period as a threshold for a heavy precipitation event. Then, for each year, the number of days above that threshold was derived. The figures on temperature and precipitation anomaly show the deviation from the mean temperature and mean precipitation for the 1979-2013 reference period.


The estimated exposure to future extreme climate impact events (crop failure, drought, river flood, wildfire, tropical cyclone, and heatwave) is based on a published dataset by Lange et al. 2020 derived from ISIMIP2b data. The same global climate models and RCPs as described above were used. Within each 30-year period, the number of years with an extreme event and the average proportion of the site affected were calculated (see Kiribou et al. subm. for details).
The estimated exposure to future extreme climate impact events (crop failure, drought, river flood, wildfire, tropical cyclone, and heatwave) is based on a published dataset by Lange et al. 2020 derived from ISIMIP2b data. The same global climate models and RCPs as described above were used. Within each 30-year period, the number of years with an extreme event and the average proportion of the site affected were calculated ([[#R02295|Kiribou et al. 2024]]).


'''Table 8. Estimated past and projected climatological characteristics in Okomu National Park'''
'''Table 8. Estimated past and projected climatological characteristics in Okomu National Park'''
Line 211: Line 554:
|31.2
|31.2
|34.9
|34.9
|34.799999999999997
|34.8
|34.9
|34.9
|38.1
|38.1
Line 217: Line 560:
|No. days with heavy precipitation (per year)
|No. days with heavy precipitation (per year)
|6
|6
|9.8000000000000007
|9.8
|9.4
|9.4
|9.9
|9.9
Line 238: Line 581:
|Crop failure
|Crop failure
|4
|4
|2.0699999999999998
|2.07
|1.5
|1.5
|1.57
|1.57
|2
|2
|2.0699999999999998
|2.07
|7.5
|7.5
|2.0699999999999998
|2.07
|-
|-
|Drought
|Drought
Line 297: Line 640:
|}
|}


<div><ul><li style="display: inline-block; vertical-align: top;"> [[File:PrecipAnomaly_Okomu.png| 450px | thumb| none | Precipitation anomaly in Okomu National Park]] </li><li style="display: inline-block; vertical-align: top;"> [[File:TempAnomaly_Okomu.png | 450px | thumb| none | Temperature anomaly in Okomu National Park]] </li></ul></div>


= External links =
= External links =
Line 304: Line 649:
= References =
= References =


BirdLife International. (2020). Important Bird Areas factsheet: Okomu National Park. Downloaded from http://www.birdlife.org on 19/10/2020.
<span id="R01468"></span>ANI (2025). ANI Annual report. Online: https://www.africanatureinvestors.org/resources


Nwankwo, E. A. (2016). Sustainable Wildlife Conservation at Okomu National Park. Ottoman Journal of Tourism and Management Research, 1(1), 101-118. https://doi.org/10.26465/ojtmr.2016132258
<span id="R01469"></span>Nwankwo, E. A. (2016). Sustainable Wildlife Conservation at Okomu National Park. ''Ottoman Journal of Tourism and Management Research'', 1(1), 101-118. [https://doi.org/10.26465/ojtmr.2016132258 doi:10.26465/ojtmr.2016132258]
 
<span id="R02295"></span>Kiribou, R., Tehoda, P., Chukwu, O., Bempah, G., Kühl, H. S., Ferreira, J., …, & Heinicke, S. (2024). Exposure of African ape sites to climate change impacts. ''PLOS Climate'', 3(2), e0000345. [https://doi.org/10.1371/journal.pclm.0000345 doi:10.1371/journal.pclm.0000345]






'''Page created by: '''APES Atlas Team''' Date:''' 2020-12-02
'''Page created by: '''APES Atlas Team''' Date:''' 2020-12-02
'''Page updated by: '''Tunde Morakinyo''' Date:''' 2026-06-08

Latest revision as of 17:54, 15 October 2026

West Africa > Nigeria > Okomu National Park

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Summary

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  • Nigeria-Cameroon chimpanzees (Pan troglodytes ellioti) are likely absent in Okomu National Park.
  • The population has likely been extirpated.
  • The site has a total size of 224 km².
  • Key threats to chimpanzees are poaching and habitat loss due to logging and agriculture.
  • Conservation activities at the site include patrols, habitat protection and education in local communities.


  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin

Site characteristics

Located in southwestern Nigeria, the site was upgraded from wildlife sanctuary to national park in 1999 (Nwankwo & Halilu 2016). . The vegetation of Okomu National Park is mostly lowland rainforest and supports a rich diversity of species including one of Nigeria’s last populations of critically endangered forest elephant, white-bellied pangolin, leopard, and forest buffalo. Chimpanzees have not been detected in the park for over 20 years. Other important species include the white-throated guenon monkey, red-capped mangabey monkey, yellow-crested hornbill, and West Africa’s largest population of African grey parrots. However, the park has been plagued by illegal logging, unsustainable slash-and-burn agriculture, and insecurity in the park’s riverine southern areas bordering the Niger Delta. Other threats include expanding oil palm, rubber, and cocoa plantations, and bushmeat poaching. ANI Foundation signed a 30-year Partnership Agreement with the National Park Service (NPS) to co-manage Okomu National Park in 2022 (ANI 2025).


Table 1. Basic site information for Okomu National Park

Species Pan troglodytes ellioti
Area 224 km²
Coordinates Lat: 6.252 , Lon: 5.268
Type of site Protected area (National Park)
Habitat types Subtropical/tropical moist lowland forest, Subtropical/tropical heavily degraded former forest
Type of governance Shared governance

Types of sites Governance types Habitat types

Ape status

Chimpanzees have no been seen at the site in the last few decades. Annual camera trap surveys conducted by ANI since 2023 have not captured chimpanzees (Morakinyo pers. comm. 2026).

Table 2. Ape population estimates reported for Okomu National Park

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 2026 Absent Okomu National Park Camera trap Morakinyo pers. comm. 2026
Pan troglodytes ellioti 2025 Absent Okomu National Park Camera trap Morakinyo pers. comm. 2026
Pan troglodytes ellioti 2024 Absent Okomu National Park Camera trap Morakinyo pers. comm. 2026
Pan troglodytes ellioti 2023 Absent Okomu National Park Camera trap Morakinyo pers. comm. 2026

Sampling methods Analytical frameworks

Threats

Table 3. Threats to apes reported for Okomu National Park

Category Specific threats Threat level Description Year of threat
2 Agriculture & aquaculture 2.1.1 Shifting agriculture Medium (30-70% of population affected) ANI 2025 2022-Ongoing (2026)
4 Transportation & service corridors 4.1 Roads & railroads Low (up to 30% of population affected) ANI 2025 2022-Ongoing (2026)
5 Biological resource use 5.1.1 Subsistence bushmeat hunting High (more than 70% of population affected) ANI 2025 2022-Ongoing (2026)
5 Biological resource use 5.1.3 Commercial bushmeat trade High (more than 70% of population affected) Driven by commerce (ANI 2025, Morakinyo pers. comm. 2026). 2022-Ongoing (2026)
5 Biological resource use 5.3.1 Subsistence logging High (more than 70% of population affected) Driven by commerce, not large-scale operations (ANI 2025, Morakinyo pers. comm. 2026). 2022-Ongoing (2026)
6 Human intrusions & disturbance 6.2 War, civil unrest & military exercises Medium (30-70% of population affected) Threat to rangers conducting patrols (ANI 2025). 2022-Ongoing (2026)
8 Invasive & other problematic species, genes & diseases 8.1 Invasive non-native/alien species Low (up to 30% of population affected) ANI 2025 2022-Ongoing (2026)

Threats

Conservation activities

Conservation activities implemented under the National Park Service-ANI Foundation co-management agreement includes ranger patrols to counter illegal activities, as well as habitat protection and restoration, education, and livelihoods incentive programmes for local communities.

Table 4. Conservation activities reported for Okomu National Park

Category Specific activity Description Implementing organization(s) Year of activity
2 Counter-wildlife crime 2.3 Conduct regular anti-poaching patrols ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.6 Regularly de-activate/remove ground snares ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.7 Provide better equipment (e.g., guns) to anti-poaching ranger patrols ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.8 Provide training to anti-poaching ranger patrols ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.11 Implement monitoring surveillance strategies (e.g., SMART) or use monitoring data to improve effectiveness of wildlife law enforcement patrols ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.12 Implement community control of patrolling, banning hunting and removing snares ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.13 Provide sustainable alternative livelihoods; establish fish- or domestic meat farms ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
2 Counter-wildlife crime 2.14 Employ hunters in the conservation sector to reduce their impact ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
4 Education & awareness 4.1 Educate local communities about apes and sustainable use ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
4 Education & awareness 4.2 Involve local community in ape research and conservation management ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
4 Education & awareness 4.4 Regularly play TV & radio announcements to raise ape conservation awareness ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
4 Education & awareness 4.5 Implement multimedia campaigns using theatre, film, print media, discussions ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
4 Education & awareness 4.6 Integrate religion/local taboos into conservation education Implemented through environmental education outreach activities in local schools (Morakinyo pers. comm. 2026, ANI 2025). Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
5 Protection & restoration 5.1 Create buffer zones around protected ape habitat ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
5 Protection & restoration 5.2 Legally protect ape habitat ANI 2025 Africa Nature Investors (ANI), National Park Service 1999-Ongoing (2026)
5 Protection & restoration 5.5 Demarcate and enforce boundaries of protected areas ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
5 Protection & restoration 5.6 Habitat restoration ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
5 Protection & restoration 5.8 Restrict number of people that are allowed access to site ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
5 Protection & restoration 5.9 Resettle illegal human communities (i.e., in a protected area) to another location ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
7 Economic & other incentives 7.1 Provide monetary benefits to local communities for sustainably managing their forest and its wildlife (e.g., REDD, alternative income, employment) ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)
7 Economic & other incentives 7.2 Provide non-monetary benefits to local communities for sustainably managing their forest and its wildlife (e.g., better education, infrastructure development) ANI 2025 Africa Nature Investors (ANI), National Park Service 2022-Ongoing (2026)

Conservation activities

  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin
  • © ANI Foundation & Jack Devlin

Challenges

Table 5. Challenges reported for Okomu National Park

Challenges Specific challenges Source Year(s)
1 Site management 1.1 Need for improved leadership ANI 2025 Ongoing (2026)
1 Site management 1.2 Need for improved coordination ANI 2025 Ongoing (2026)
1 Site management 1.3 Corruption ANI 2025 Ongoing (2026)
1 Site management 1.4 Conflict on land tenure ANI 2025 Ongoing (2026)
2 Resources and capacity 2.1 Lack of capacity/training ANI 2025 Ongoing (2026)
2 Resources and capacity 2.2 Lack of staff ANI 2025 Ongoing (2026)
2 Resources and capacity 2.3 General lack of funding ANI 2025 Ongoing (2026)
2 Resources and capacity 2.4 Lack of continuous/long-term funding ANI 2025 Ongoing (2026)
2 Resources and capacity 2.5 Lack of equipment ANI 2025 Ongoing (2026)
2 Resources and capacity 2.6 Lack of biomonitoring/survey data ANI 2025 Ongoing (2026)
2 Resources and capacity 2.7 Lack of infrastructure ANI 2025 Ongoing (2026)
2 Resources and capacity 2.8 Lack of evidence of conservation effectiveness ANI 2025 Ongoing (2026)
3 Engaged community 3.1 General lack of community engagement or support ANI 2025 Ongoing (2026)
3 Engaged community 3.2 Lack of youth engagement ANI 2025 Ongoing (2026)
3 Engaged community 3.3 Lack of volunteers ANI 2025 Ongoing (2026)
3 Engaged community 3.4 Eroding taboos in favor of conservation ANI 2025 Ongoing (2026)
3 Engaged community 3.5 Anticipated disadvantages/costs created by conservation activities (e.g., restricted access/ resource use) ANI 2025 Ongoing (2026)
4 Institutional support 4.1 Lack of law enforcement ANI 2025 Ongoing (2026)
4 Institutional support 4.2 Lack of government support ANI 2025 Ongoing (2026)
4 Institutional support 4.4 Lack of transboundary cooperation ANI 2025 Ongoing (2026)
5 Ecological context 5.1 Ecological constraints (e.g., susceptibility to climate change, difficult terrain) ANI 2025 Ongoing (2026)
6 Safety and stability 6.1 Political/economic instability ANI 2025 Ongoing (2026)
6 Safety and stability 6.2 Insecurity ANI 2025 Ongoing (2026)

Challenges

Enablers

Table 6. Enablers reported for Okomu National Park

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

Enablers

Research activities

Documented behaviours

Table 7. Behaviours documented for Okomu National Park

Category Behavior Observation type Prevalence Observation dates Source Habituation Species Comment
Not reported

Behaviours

Exposure to climate change impacts

As part of a study on the exposure of African great ape sites to climate change impacts, Kiribou et al. (2024) extracted climate data and data on projected extreme climate impact events for the site. Climatological characteristics were derived from observation-based climate data provided by the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP, www.isimip.org). Parameters were calculated as the average across each 30-year period. For 1981-2010, the EWEMBI dataset from ISIMIP2a was used. For the two future periods (2021-2050 and 2071-2099) ISIMIP2b climate data based on four CMIP5 global climate models were used. For future projections, two Representative Concentration Pathways (RCP) were used. RCP 2.6 is a scenario with strong mitigation measures in which global temperatures would likely rise below 2C. RCP 6.0 is a scenario with medium emissions in which global temperatures would likely rise up to 3C by 2100. For the number of days with heavy precipitation events, the 98th percentile of all precipitation days (>1mm/d) was calculated for the 1979-2013 reference period as a threshold for a heavy precipitation event. Then, for each year, the number of days above that threshold was derived. The figures on temperature and precipitation anomaly show the deviation from the mean temperature and mean precipitation for the 1979-2013 reference period.

The estimated exposure to future extreme climate impact events (crop failure, drought, river flood, wildfire, tropical cyclone, and heatwave) is based on a published dataset by Lange et al. 2020 derived from ISIMIP2b data. The same global climate models and RCPs as described above were used. Within each 30-year period, the number of years with an extreme event and the average proportion of the site affected were calculated (Kiribou et al. 2024).

Table 8. Estimated past and projected climatological characteristics in Okomu National Park

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] 27.2 28.3 28.1 28.5 29.5
Annual precipitation [mm] 2338 2398 2415 2382 2440
Max no. consecutive dry days (per year) 31.2 34.9 34.8 34.9 38.1
No. days with heavy precipitation (per year) 6 9.8 9.4 9.9 11.7


Table 9. Projected exposure of apes to extreme climate impact events in Okomu National Park

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 4 2.07 1.5 1.57 2 2.07 7.5 2.07
Drought 0 0 0 0 0 0 0.25 25
Heatwave 10 100 10.5 100 10.5 100 12.5 100
River flood 2 2.92 2.25 1.43 2.25 3.06 4 6.32
Tropical cyclone 0 0 0 0 0 0 0.5 1.21
Wildfire 30 0.44 30 0.44 29 0.44 29 0.47


  • Precipitation anomaly in Okomu National Park
  • Temperature anomaly in Okomu National Park

External links

References

ANI (2025). ANI Annual report. Online: https://www.africanatureinvestors.org/resources

Nwankwo, E. A. (2016). Sustainable Wildlife Conservation at Okomu National Park. Ottoman Journal of Tourism and Management Research, 1(1), 101-118. doi:10.26465/ojtmr.2016132258

Kiribou, R., Tehoda, P., Chukwu, O., Bempah, G., Kühl, H. S., Ferreira, J., …, & Heinicke, S. (2024). Exposure of African ape sites to climate change impacts. PLOS Climate, 3(2), e0000345. doi:10.1371/journal.pclm.0000345


Page created by: APES Atlas Team Date: 2020-12-02

Page updated by: Tunde Morakinyo Date: 2026-06-08

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