Summary

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The main conservation activities is inventory and ecological monitoring.
The population size is estimated to be around 931 individuals (Western lowland gorillas and Central chimpanzees).
The population density of great apes has declined by approximately 70% since the late 1990s.
The site has a total size of 7,800 km².
Key threats to chimpanzees are hunting and logging.
The main conservation activities include regular patrols, awareness raising, and monetary benefits.

Site characteristics

Located at the northern edge of the Congo Forest Basin, Ngotto is of particular interest due to its intersection with the northern savannah ecosystem. Until recently, it remained one of the last extensive tracts of natural forest in the southwestern Central African Republic (Hicks et al. 2009). The Ngotto forest complex, covering 780,000 hectares, includes the Mbaéré-Bodingué National Park (80,000 ha) and adjacent forest concessions. This critical ecosystem lies at the transition between savanna and tropical forest biomes and supports endangered species such as elephants, gorillas, and chimpanzees. Since the end of the ECOFAC project, this biodiversity has come under increasing pressure. A recent inventory of wildlife and flora was conducted to relaunch conservation efforts in the park and surrounding areas. The study confirmed the presence of 27 mammal species and 323 woody plant species. It also identified three key wildlife-rich zones, relatively undisturbed due to natural isolation, which serve as biodiversity refuges. The estimated population of gorillas and chimpanzees was 931 individuals, reflecting a density decline of approximately 70% since the late 1990s. Among the woody species, six were classified as Vulnerable and eight as Endangered by the IUCN. Human activities ranging from sustainable traditional practices to harmful ones such as slash-and-burn agriculture, commercial hunting, and logging continue to threaten biodiversity. The inventory provides a baseline for monitoring future conservation efforts and underscores the urgent need for strategic action to prevent further biodiversity loss (N'Goran et al. 2024).

Table 1. Basic site information for Ngotto Forest

Species	Pan troglodytes troglodytes, Gorilla gorilla gorilla
Area	7,800 km²
Coordinates	Lat: 3.889943 , Lon: 17.315173
Type of site	Non-protected area
Habitat types	Subtropical/tropical moist lowland forest, Subtropical/tropical dry forest
Type of governance	Governance by government

Types of sites Governance types Habitat types

Ape status

A total of 0.32 great ape nests per kilometer were found in the logged section of the forest, compared with 3.52 nests per kilometer in the immediately adjacent unlogged but transected forest, 11 times the difference (Hicks et al. 2009).

Table 2. Ape population estimates reported for Ngotto Forest

Species	Year	Occurrence	Encounter or vistation rate (nests/km; ind/day)	Abundance estimate (95% CI)	Survey area	Sampling method	Analytical framework	Source
'Gorilla gorilla gorilla & Pan troglodytes troglodytes	2024	Present		931 (357-2427)	Ngotto Forest Complex, National Park and adjacent forest concessions	Line transects & recces, Camera trap	Distance sampling	N'Goran et al. 2024
Pan troglodytes troglodytes	2001-2002		0.40		Ngotto Forest	Line transects		Hicks et al. 2009
Gorilla gorilla gorilla	2001-2002		0.49		Ngotto Forest	Line transects		Hicks et al. 2009

Sampling methods Analytical frameworks

Threats

The timber company Industrie Forestiére du Batalimo (IFB) has been selectively exploiting the Ngotto Forest, concession PEA 169, since the late 90s. Surveyors for the logging company lived for weeks in the forest in makeshift camps. Hunters associated with the logging company regularly hunted using wire snares, shotguns, and flashlights for night hunting.T. C. Hicks observed logging trucks on nearby roads transporting large sacks of bushmeat, likely destined for sale in urban areas (Hicks et al. 2009).

Table 3. Threats to apes reported for Ngotto Forest

Category	Specific threats	Threat level	Description	Year of threat
2 Agriculture & aquaculture	2.1 Annual & perennial non-timber crops	Present (unknown severity)	Agricultural expansion, shifting cultivation, and plantations were reported among the main threats, as they destroy habitats and impoverish soils (N'Goran et al. 2024).	Ongoing (2024)
5 Biological resource use	5.1 Hunting & collecting terrestrial animals	High (more than 70% of population affected)	Bushmeat hunting linked to the presence of loggers (Hicks et al. 2009, N'Goran et al. 2024).	2009-Ongoing (2024)
5 Biological resource use	5.2 Gathering terrestrial plants	Present (unknown severity)	The collection of mushrooms and other forest products was also reported (N'Goran et al. 2024).	Ongoing (2024)
5 Biological resource use	5.3 Logging & wood harvesting	High (more than 70% of population affected)	Parts of the forest are, or have been, logging concessions (Hicks et al. 2009, N'Goran et al. 2024).	2009-Ongoing (2024)
7 Natural system modifications	7.1 Fire & fire suppression	Present (unknown severity)	Uncontrollable bushfires and slash-and-burn agriculture were also reported among the main threats (N'Goran et al. 2024).	Ongoing (2024)

Threats

Conservation activities

Table 4. Conservation activities reported for Ngotto Forest

Category	Specific activity	Description	Implementing organization(s)	Year of activity
2 Counter-wildlife crime	2.11 Implement monitoring surveillance strategies (e.g., SMART) or use monitoring data to improve effectiveness of patrols	The inventory and ecological monitoring were conducted to establish baselines that strengthen surveillance and support future impact assessments. This was initiated as part of the GEF Phase 7 Program, supported by the World Bank, with WWF (N'Goran et al. 2024).	Fonds pour l’Environnement Mondial (GEF), the World Bank, and WWF	Ongoing (2024)

Conservation activities

Challenges

Table 5. Challenges reported for Ngotto Forest

Challenges	Specific challenges	Source	Year(s)
2 Resources and capacity	2.6 Lack of biomonitoring/survey data	N'Goran et al. 2024	Ongoing (2024)
4 Institutional support	4.1 Lack of law enforcement	Hicks et al. 2009, N'Goran et al. 2024	2009-Ongoing (2024)
4 Institutional support	4.3 Lack of protected area status	N'Goran et al. 2024	Ongoing (2024)

Challenges

Enablers

Table 6. Enablers reported for Ngotto Forest

Enablers	Specific enablers	Source	Year(s)
2 Resources and capacity	2.6 External partnerships that add expertise or resources	N'Goran et al. 2024	Ongoing (2024)
1 Site management
3 Engaged community
4 Institutional support
5 Ecological context
6 Safety and stability

Enablers

Research activities

Documented behaviours

Table 7. Behaviours documented for Ngotto Forest

Category	Behavior	Observation type	Prevalence	Observation dates	Source	Habituation	Species	Comment
	Ant dipping				Hicks, Fouts & Fouts 2005
	Honey extraction with tools				Hicks, Fouts & Fouts 2005

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. 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.

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).

Table 8. Estimated past and projected climatological characteristics in Ngotto Forest

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]	24.4	25.5	25.6	25.9	26.8
Annual precipitation [mm]	1488	1496	1546	1567	1538
Max no. consecutive dry days (per year)	21.5	25.5	24.9	23.7	28.5
No. days with heavy precipitation (per year)	6.2	9.8	11	11.6	12.7

Table 9. Projected exposure of apes to extreme climate impact events in Ngotto Forest

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	5.5	0.01	3.5	0.01	5	0.02	7.5	0.02
Drought	0	0	0	0	0	0	0	0
Heatwave	1	100	0.5	50	1.5	100	3.5	100
River flood	0.5	1.44	0.75	0.98	0	0	1	2.22
Tropical cyclone	0	0	0	0	0	0	0	0
Wildfire	30	1.05	30	0.99	29	0.95	29	0.96

Precipitation anomaly in Ngotto Forest
Temperature anomaly in Ngotto Forest

External links

References

Hicks, T.C., Fouts, R.S. & Fouts, D.H.(2009). A Survey of Chimpanzees (Pan troglodytes troglodytes) and Gorillas (Gorilla gorilla gorilla) in the Selectively Logged Ngotto Forest, Central African Republic. Journal of Applied Animal Welfare Science,12(3),165-188.

Hicks, T.C., Fouts R.S. & Fouts, D.H. (2005). Chimpanzee (Pan troglodytes troglodytes) Tool Use in the Ngotto Forest, Central African Republic. American Journal of Primatology 65, 221-237.

N'Goran, K. P., Beukou Choumbou, G. B., Ndotar, A., & Deguene, B. (2024). Inventaire de faune et de flore dans la forêt de Ngotto (Parc National Mbaéré Bodingué et sa périphérie). WWF/Bureau Régional pour l'Afrique/ Bureau du Cameroun/ Congo Basin Impact Monitoring Programme & WWF/Bureau de la République Centrafricaine.

Page created by: APES Atlas Team Date: 2021-01-08