West Nimba Community Forest
Summary
- Western chimpanzees (Pan troglodytes verus) are present in West Nimba Community Forest.
- The population size is 26 individuals.
- The chimpanzee population trend is unknown.
- This site has a total size of 105 km².
- Key threats to chimpanzees are large-scale mining and poaching.
- West Nimba has been removed from the list of proposed protected areas and become a community forest (Johnson 2015). At least one of three chimpanzee communities in West Nimba Community Forest lives directly west of one of the mining sites. The Nimba Mountains are an Alliance Zero Extinction (AZE) site.
Site characteristics
Nimba County is located in the western part of the Upper Guinea Ecoregion, which extends from Sierra Leone to the Sassandra River in Côte d’Ivoire. The West Upper Guinea forest ecosystem is characterized by exceptional biological richness and the endemism of its flora and fauna (CI 2012). West Nimba Community Forest is part of the Northern Nimba Conservation Area (NNCA), which is located in northeastern Liberia. The latter forms an integral part of the northeastern forest block of the country. The NNCA is comprised of the East Nimba Nature Reserve (ENNR), West Nimba Community Forest, ArcelorMittal Liberia (AML) concessions, and several towns. The area spans two districts of Nimba County: Yarmein and Gbelegay (CI 2012). Mount Nimba, which spans three countries, is one of the most famous sites for biodiversity conservation in West Africa and has been identified as a priority biodiversity hotspot for conservation (CI 2012). West Nimba was once designated a proposed protected area (Junker et al. 2015), but its protected status was modified later on (Johnson 2015). The following species were recorded in West Nimba Community Forest: western lesser spot-nosed monkey Cercopithecus petaurista buettikoferi, Campbell’s monkey Cercopithecus campbelli, sooty mangabey Cercocebus atys and the vulnerable king colobus Colobus polykomos, the near threatened bay duiker Cephalophus dorsalis and African buffalo Syncerus caffer, bush buck Tragelaphus scriptus, leopard Panthera pardus and African civet Civettictis civetta (CI 2012).
Table 1: Basic site information for West Nimba Community Forest
| Area | 105 km² |
| Coordinates | 7.48 N, -8.71 W |
| Designation | Community Forest |
| Habitat types | Subtropical/Tropical Moist Montane Forest, Subtropical/Tropical Swamp Forest, Subtropical/Tropical Heavily Degraded Former Forest, Rural Gardens |
Ape status
According to the literature, the area was first surveyed in 2005 by Fauna & Flora International (FFI), in collaboration with the Forestry Development Authority (FDA), the Environmental Protection Agency of Liberia (EPA), and the Ministry of Planning and Economic Affairs (MPEA). While chimpanzees were apparently recorded during this survey (CI 2012), no further details on the survey results could be found. During another survey conducted by Conservation International (CI), in collaboration with the Wild Chimpanzee Foundation (WCF), Actions pour la Conservation de la Biodiversité (ACB-CI), and AML from 2010-2011, the study area was divided into three different sites: the Gangra-Yuelliton site (21.26 km²) where mining will be carried out, the Tokadeh site (19.88 km², under exploitation since May 2011) and the West Nimba site (79.97 km², the remaining West Nimba forest). The chimpanzee population was estimated at 26 individuals with a density of 0.21 chimpanzees/ km².
Table 2: Great ape population estimates in West Nimba Community Forest
| Species | Year | Abundance estimate (95% confidence interval) | Density estimate (per km²) | Encounter rate (nests/km) | Area | Method | Source | Comments | A.P.E.S. database ID |
|---|---|---|---|---|---|---|---|---|---|
| Pan troglodytes verus | 2005 | Present | West Nimba Community Forest | Index survey | FFI 2005 in Johnson 2015 | ‘BIOPA’ in CI 2012, Johnson 2015; ‘reconnaissance walk’; collaborative effort of FFI, FDA, EPA, MPEA (Johnson 2015) | |||
| Pan troglodytes verus | 2010-2011 | 26 (10-67) | 0.21 (0.05-0.55) | Gangra-Yuelliton:1.97; Tokadeh 0.4; West Nimba 0.74 | West Nimba Community Forest | Line transects (Distance) | CI 2012 (in collaboration with the WCF, ACB-CI, AML) | Survey effort: 122 km, study area: 121 km² |
Threats
Mount Nimba was exploited for iron ore by LAMCO from the 1960s until the early 1990s. A large part of West Nimba’s forest comprising the Gangra Mountain, the Yuelliton Mountain and the Tokadeh Mountain has been granted for iron ore mining to AML (CI 2012). AML holds a Class A mining license, which entails that mining is permitted in the proposed production area (no size limit) for at least 25 years (Wilson et al. 2017). The 2010-2011 survey results showed that the chimpanzee distribution range overlaps largely with the mining sites (CI 2012). The bushmeat study that was conducted by CI (2012) in West Nimba Community Forest showed that hunting had a huge impact on wildlife in the area (CI 2012). Ancestral hunting methods had all but disappeared and been replaced by cable snares and shotguns year-round without regard for legislation. Traps accounted for 41% of the off-takes and catch both small and big game, guns, most of which were locally built, accounted for 58% of the off-takes and were used both day and night (CI 2012). The sources of water pollution are erosion at the mine site, waste dumps and stockpiles, oil and grease, discharge from settlement and attenuation ponds, and ore handling and loading. However, ore will not be processed for DSO Phase 1, which will eliminate some potential sources of pollution, but investigations revealed that the head of streams and downstream larger rivers would be affected (CI 2012).
Table 3: Threats to great apes in West Nimba Community Forest
| 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 | Medium | Encounter rate: 0.58 farms/ km surveyed | Cassava farms, cocoa farms, coffee farms, plantain farms, rice farms, new forest cutting and old farms (CI 2012) | Ongoing (2012) |
| 3. Energy production & mining | 3.2 Mining & Quarrying | High | Encounter rate: 0.68 mining signs/ km surveyed | Open-pit mining for iron ore (CI 2012) | Ongoing (2012) |
| 4. Transportation & service corridors | Unknown | ||||
| 5. Biological resource use | 5.1 Hunting & Collecting Terrestrial Animals | High | Hunting sign encounter rates: 0.02 hunting camps-, 3.2 hunting trails-, and 0.08 gun shots heard/ km surveyed | Hunting signs recorded during line transect survey (CI 2012) | Ongoing (2012) |
| 5.3 Logging & Wood Harvesting | Medium | Encounter rate: 0.5 logging signs/ km surveyed | Logging signs recorded during line transect survey (CI 2012) | Ongoing (2012) | |
| 6. Human intrusions & disturbance | Unknown | ||||
| 7. Natural system modifications | Unknown | ||||
| 8. Invasive & other problematic species, genes, diseases | Unknown | ||||
| 9. Pollution | 9.2 Industrial & Military Effluents | High | Water-, and air pollution caused by open-pit mining operations at this site (CI 2012) | Ongoing (2012) | |
| 9.6 Excess Energy | High | Noise from mining activities (CI 2012) | Ongoing (2012) | ||
| 10. Geological Events | Absent | ||||
| 11. Climate change & severe weather | Unknown | ||||
| 12. Other options | Absent |
Conservation activities
No conservation activities could be found for the site.
Table 4: Conservation activities in West Nimba Community Forest
| 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 intrusions & 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 |
Impediments
No information on impediments has been documented.
Table 5: Impediments reported for West Nimba Community Forest
| Impediment | Source |
|---|---|
| Not reported |
Research activities
No information on research activities has been documented.
Documented behaviours
Table 6: Great ape behaviors reported for West Nimba Community Forest
| Behavior | Source |
|---|---|
| Not reported |
Relevant datasets
References
Conservation International (CI) 2012. Further Ecological Studies as Part of the Environmental and Social Impact Assessment for Arcelormittal Liberia: Bushmeat and Biomonitoring Studies in the Northern Nimba Conservation Area. Unpublished report. Conservation International and ArcelorMittal, Liberia.
Johnson S. 2015. Aggregated Biodiversity Offsets: A Roadmap for Liberia’s Mining Sector. Unpublished report by the World Bank Group (WBG) and Program On Forests (PROFOR).
Junker J, Boesch C, Freeman T, Mundry R, Stephens C, Kühl HS. 2015. Integrating wildlife conservation with conflicting economic land-use goals in a West African biodiversity hotspot. Basic and Applied Ecology: doi:10.1016/j.baae.2015.07.002.
Wilson STK, Wang H, Kabenge M, Qi X. 2017. The mining sector of Liberia: current practices and environmental challenges. Environmental Science and Pollution Research 24: 18711–18720.
Page completed by: A.P.E.S. Wiki Team Date: 11/11/2019