Sapo National Park
Summary
- Western chimpanzees (Pan troglodytes verus) are present in Sapo National Park.
- It has been estimated that 1,055 (CI: 595-1,870) individuals occur in the site.
- The chimpanzee population trend is stable.
- The park has a total size of 1,804 km².
- Key threats to chimpanzees are poaching and illegal mining.
- Conservation activities have focused on long-term bio-monitoring and law enforcement.
- Sapo National Park is Liberia's first protected area, established in 1983.
Site characteristics
Located in southeastern Liberia, Sapo National Park is Liberia's first protected area and represents one of the most intact forest ecosystems of the country (Tweh et al. 2018). The area of the park was extended from 1,304 km² to 1,804 km² in 2003 (Tweh et al. 2018). The park forms part of the Upper Guinean Forest ecosystem, and contains high levels of biodiversity (N'Goran et al. 2010). In addition to the western chimpanzee, other endangered and vulnerable species inhabit the site, including forest elephants (Loxodonta africana), pygmy hippopotamus (Hexaprotodon liberiensis), Jentink’s duiker (Cephalophus jentinki), red colobus (Piliocolobus badius), and Diana monkeys (Cercopithecus diana diana, N'Goran 2010).
Table 1. Basic site information for Sapo National Park
| Area: | 1804 km² |
| Coordinates | 5.378432, -8.496117 |
| Designation: | National park |
| Habitat types: | Subtropical/tropical moist lowland |
Ape status
A survey in 1982 (one year before the establishment of the park), confirmed the presence of chimpanzees in the Sapo forest (Anderson et al. 1983). Based on the estimates from two surveys, one in 2009 (N'Goran et al. 2010) and a second one in 2017 (Tweh et al. 2018), the chimpanzee population in the park has remained relatively stable, with an estimated abundance of approximately 1,055 individuals.
Table 2. Great ape population estimates in Sapo National Park
| Species | Year | Abundance estimate (95% CI) | Density estimate [ind./ km²] (95% CI) | Encounter rate | Area | Method | Source | Comments | A.P.E.S. database ID |
|---|---|---|---|---|---|---|---|---|---|
| Western chimpanzee | 1983 | 0.24 | Present | Southeastern sector of the park (50 km²) | Line transects (Distance) | Anderson et al. 1983 | Total survey effort: 42.7 km | ||
| Western chimpanzee | 2002 | Present | Sapo National Park | Line transects (Distance) | Waitkuwait 2003 | Assessment of Fauna & Flora International's bio-monitoring programme | |||
| Western chimpanzee | 2007-2009 | 0.27 | Sapo National Park, excluding south east area | Line transects (Distance) | Vogt 2011 | Fauna & Flora International bio-monitoring programme | |||
| Western chimpanzee | 2009 | 1079 (CI: 713-1633) | 0.86 | 4.05 | Sapo National Park, excluding mining areas | Line transects (Distance) | N'Goran et al. 2010 | ||
| Western chimpanzee | 2016-2017 | 1055 (CI: 595-1870) | 0.83 | Sapo National Park, excluding south east area | Line transects (Distance) | Tweh et al. 2018 | Total survey effort: 38.38 km |
Threats
Sapo National Park has been primarily threatened by illegal hunting and mining (Tweh et al. 2018; Greengrass 2015; N'Goran et al. 2010). An estimated 18,000 illegal miners were inhabiting the park in 2010, the majority of which was evicted by the government on the same year (Vogt 2011). A survey of two commercial hunting camps bordering the park revealed high hunting pressure in the area, and the majority of bushmeat harvested was destined to urban areas (Greengrass 2015). The carcasses documented during this survey included chimpanzees as well as other endangered and vulnerable species, such as the red colobus monkey, Diana monkey, and pygmy hippopotamus. Furthermore, the development of the road network around the park is expected to increase hunting pressure and facilitate the bushmeat trade (Greengrass 2015), as well as other illegal activities in the park.
Table 3. Threats to great apes in Sapo National Park
| Category | Specific threats | Threat level | Quantified severity | Description | Year of threat |
|---|---|---|---|---|---|
| 1. Residential & commercial development | 1.1 Housing & Urban Areas | High | 18,000 settlers in 2010 | Illegal settlement of miners (Vogt 2011) | 2010 |
| 2. Agriculture & aquaculture | 2.1 Annual & perennial non-timber crops | Present | Present as a result of illegal settlements; scale unknown (N’Goran et al. 2010) | Ongoing (2010) | |
| 3. Energy production & mining | 3.2 Mining & quarrying | High | Illicit gold mining which has decreased since 2010 (Tweh et al. 2018); artisanal mining is still present (Junket per. comm. 2019) | Ongoing (2018, 2019) | |
| 4. Transportation & service corridors | 4.1 Roads & railroads | Present | Development of the road network around the park facilitates illegal human activities in the park (Greengrass 2015) | Ongoing (2015) | |
| 5. Biological resource use | 5.1 Hunting & Collecting Terrestrial Animals | High | Hunting sign encounter rate: 1.7/km (Tweh et al. 2018) | Poaching represents a major threat to chimpanzees and other species in the park (Tweh et al. 2018, N’Goran et al. 2010, Greengrass 2015), and most of the bushmeat is destined to urban areas (Greengrass 2015) | Ongoing (2010, 2015, 2018) |
| 6. Human intrusion & disturbance | 6.2 War, civil unrest & military exercises | High | Two civil wars since the establishment of the park disrupted conservation activities, and led to illegal occupation of the park, as well as poaching and extraction of natural resources (Greengrass 2015, Collen et al. 2011) | 1989-1996, 1999-2003 | |
| 7. Natural system modifications | Unknown | ||||
| 8. Invasive & other problematic species, genes, diseases | Unknown | ||||
| 9. Pollution | Unknown | ||||
| 10. Geological Events | Absent | ||||
| 11. Climate change & severe weather | Unknown | ||||
| 12. Other options | Absent |
Conservation activities
The national park forms part of the Tai-Grebo-Sapo Forest Complex, which is a conservation priority in West Africa. Conservation efforts in Sapo National Park have mainly focused on law enforcement, conservation awareness, and bio-monitoring. The WCF has supported Community Watch Teams (CWT), which comprise members from surrounding communities, and regularly patrol and support FDA rangers (WCF 2019). CWTs have played an important role in the eviction of illegal miners from the national park (WCF 2019). In 2012, Fauna & Flora International established a long-term bio-monitoring program to follow the population trends for chimpanzees, pygmy hippopotamuses, elephants, as well as duikers, birds, reptiles, and amphibians (Tweh et al. 2018). Together with Liberia's Forestry Development Authority, permanent transects are surveyed twice a year as part of this long-term bio-monitoring program (Tweh et al. 2018).
Table 4. Conservation activities in Sapo National Park
| 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 | 5.6. Conduct regular anti-poaching patrols | Community Watch Teams supported by the WCF regularly patrol the site (WCF 2019) | Ongoing (2019) |
| 5.11. Provide training to anti-poaching ranger patrols | Members of the Community Watch Teams are trained in the use of equipment (GPS, compass, camera) and patrolling (WCF 2019) | Ongoing (2019) | |
| 5.15. Implement monitoring surveillance strategies | Long-term bio-monitoring of chimpanzee population (Tweh et al. 2018) | Ongoing (2019) | |
| 6. Human intrusion & disturbance | 6.7. Resettle illegal human communities (i.e. in a protected area) to another location | Eviction of 18,000 illegal settlers in the park by the Liberia's government (Vogt 2011) | 2010 |
| 7. Natural system modifications | Not reported | ||
| 8. Invasive & other problematic species, genes, diseases | Not reported | ||
| 9. Pollution | Not reported | ||
| 10. Education & Awareness | 10.2. Involve local community in primate research and conservation management | As part of a long-term bio-monitoring program, staff of Liberia’s Forestry Development Authority and members of the local community are involved in the surveys (Tweh et al. 2018) | Ongoing (2018) |
| 11. Habitat Protection | 11.2. Legally protect primate habitat | The area is designated as National Park (N’Goran et al. 2010) | Ongoing (2010) |
| 12. Species Management | Not reported | ||
| 13. Livelihood; Economic & Other Incentives | Not reported |
Challenges
Table 5. Challenges reported for Sapo National Park
| Impediment | Source |
|---|---|
| Lack of law enforcement | Greengrass 2015, N'Goran et al. 2010 |
| Lack of technical means | Tweh et al. 2018 |
| Lack of logistical means | Waitkuwait 2003 |
Research activities
Several surveys have been done in the park to monitor the chimpanzee population (e.g., N'Goran et al. 2010, Tweh et al. 2018), assess the impacts of conservation interventions (Tweh et al. 2018), investigate the behavior and ecology of chimpanzees in the park (Anderson et al. 1983), and investigate the impact of hunting pressure in the area (Greengrass 2015).
Documented behaviours
Table 6. Great ape behaviors reported for Sapo National Park
| Behavior | Source |
|---|---|
| Nut cracking | Anderson et al. 1983 |
References
Tweh, C., Kouakou, C.Y., Chira, R., Freeman, B., Githaiga, J.M., Kerwillain, S., Molokwu-Odozi, M., Varney M. and Junker, J. 2018. Nest counts reveal a stable chimpanzee population in Sapo National Park, Liberia. Primate Conservation 2018 (32): 12 pp.
N’Goran, K. P., Kouakou, C.Y. and Herbinger I. 2010. Report on the Population Survey and Monitoring of Chimpanzee in Sapo National Park, Liberia (June–December 2009). Report. Wild Chimpanzee Foundation, Abidjan, Côted’Ivoire.
Anderson, R., Williamson, E.A., and Carter, J. 1983. Chimpanzees of Sapo Forest, Liberia: density, nests, tools and meat-eating. PRIMAaXS, 24(4): 594-601.
Waitkuwait, W.E. 2003. Report on the First Year of Operation of a Community-based Bio-monitoring Programme in and around Sapo National Park, Sinoe County, Liberia. Report. Fauna and Flora International.
Vogt, M. 2011. Results of Sapo National Park Bio-Monitoring Programme 2007-2009. Report. Fauna & Flora International, Monrovia, Liberia.
Greengrass, E. 2015. Commercial hunting to supply urban markets threatens mammalian biodiversity in Sapo National Park. Oryx 50(3), 397–404.
Collen, B., Howard, B., Konie, J., Daniel, O., and Rist, J. 2011. Field surveys for the endangered pygmy hippopotamus Choerpsis liberiensis in Sapo National Park, Liberia. Oryx, 45(1), 35–37.
Wild Chimpanzee Foundation. 2019. Activities of the Wild Chimpanzee Foundation for improved conservation of chimpanzees and their habitat in West Africa. Annual Report 2018.
Page completed by: A.P.E.S. Wiki Team Date: 30/08/2019