The sub-regional overviews focus on selected issues and thus need to be read in the context of the regional synthesis and in relation to the issues covered in the other sub-regions.



The vast equatorial forests of the Congo basin, which dominate Africa’s tropical realm, contain a huge variety of life (Table 1). Due to its inaccessibility and a history of conflict, its ecology remains poorly studied. Within Central Africa, only Chad does not contain tropical rain forest, while in Cameroon, CAR and the DRC rain forest transitions from evergreen forest to deciduous forest, to wooded, open, and Sahelian savannahs, each transition signifying a huge shift in species composition and diversity. Plant diversity is high, with well over 10 000 species, 8 000 of which are found in the forest zone, of which 80 per cent are endemic (White 2001).

Three of the four species of great ape, the closest evolutionary relative to humans, still occur. The subregion has the highest primate diversity in Africa (Harcourt 2000).

The Congo River is the second largest river system on Earth, containing at least 669 species of fish (Champan 2001), many of which are important sources of protein for the local population.

Table 1: The biodiversity features of Central Africa
  Biodiversity opportunity Threat Response
  Area Mammals Birds Plants % of land % of land
Country km² Endemic Total Endemic Total Endemic Total transformed protected

Cameroon 475 440 14 409 8 690 156 8 260 9 7

Central African Republic 622 980 2 209 1 537 100 3 602 2 12

Chad 1 284 000 1 134 0 370   1 600 14 9

Congo 342 000 2 200 0 449 1 200 6 000 3 14

DRC 2 344 860 not
1 100 11 007 3 5

Equatorial Guinea 28 050 1 184 3 273 66 3 250 7 17

Gabon 267 670 3 190 1 466   6 651 3 0

São Tomé and Príncipe 960 4 8 25 63 134 895    

All countries 5 365 960 27   38   2 756   6 7

Sources: Biodiversity information taken from Groombridge and Jenkins (2002). Calculation of the proportion of transformed land was based on the reclassification by Hoekstra and others (2005) of the GLC3 Global Landcover Classification (Mayaux and others 2004). Hoekstra and others (2005) defined four classes of transformed land: 1) Artificial surfaces and associated areas, 2) Cultivated and managed areas, 3) Mosaic: cropland/treecover, and 4) Mosaic: cropland/other natural vegetation. In this chapter, all four classes have been integrated into the calculation of the proportion of transformed land. The area covered by classes 3 and 4 was divided by two, assuming that this reflects their mosaic character with a certain proportion of land remaining untransformed. Note that this method does not account for the degree of fragmentation within the mosaic landcover classes. Data on protected areas (IUCN class I-V) were obtained from WRI 2005


Biodiversity faces various threats, including increasing trade. Although forest elephants, gorillas, forest buffalo, bongo, okapi and giant forest hogs continue to live in large numbers in Central Africa’s forests, these species and their habitat face an uncertain future. Forest elephants once roamed over most of the nearly 2 million km² of the Congo basin forest. Considerable evidence, including that from landscape scale inventories by the Monitoring of the Illegal Killing of Elephants program (MIKE) of CITES, suggests that the elephant range has been dramatically reduced due to illegal killing for ivory and bushmeat, as well as increasing human encroachment into forest lands. Elephants may be increasingly confined to protected areas and their immediate peripheries (Blake 2002). Great apes face similar challenges, with the added spectre of disease, such as Ebola, reducing populations to a fraction of their original abundance (Walsh and others 2004).

The logging industry dominates land use and the economy in forested areas. Since its coastal beginnings, in colonial times, logging has spread to the deep interior of the forest (Bikié and others 2000, Collomb and others 2000). Logging is mostly selective due to high production costs. Canopy damage is typically 10-20 per cent, meaning that forest cover remains post-logging, but the forest ecology is significantly modified. Furthermore, logging and logging roads bring immigration into formerly remote areas, opening up the interior to use, stimulating the development of cash economies, and allowing access to distant markets (Wilkie and others 2000).

The expansion of bushmeat hunting is a major threat: between 1 and 5 million tons is harvested annually, well above sustainable levels (Robinson and Bennett 2002, Robinson and Bennett 2004). Casualties of the bushmeat trade include the great apes (gorillas, chimpanzees, and bonobos), which coupled with the real and growing threat from the Ebola virus could be driven to the verge of extinction within a decade (Walsh and others 2004). With limited national capacity for sustainable land-use planning and law enforcement, logging has become a major vehicle for a dramatically expanding illegal bushmeat trade to supply local, national and international commercial markets. Recognizing the seriousness of the threat, efforts are underway toward sustainable management of the main bushmeat species, and to promote alternative sources of protein in logging concessions and other rural and urban settings, and to diversify incomes for bushmeat hunters (CBFP 2005).

The use of bush fires in the clearing of land for agriculture and settlement as well as a hunting technique is the second major threat to biodiversity resources. Slow-growing species at the edge of the forests are disappearing and gradually being replaced by pioneer species. Regeneration of slow-growing species, which have high value timber, requires long fallow periods, which is often not allowed by the bush fires (UNEP 2004a). There is therefore a risk of forest areas disappearing and being replaced by savannah.

Inter-basin transfers of water pose several threats to biodiversity. For example, proposals have been made to divert large volumes of water from the Ubangui River (part of the Congo River basin) northwards through the CAR and Chad, and to discharge this water into the Logone-Chari rivers feeding Lake Chad (Kuwairi 2004). The proposed water transfer would have the effect of dramatically increasing the flooded extent of Lake Chad and restoring livelihoods of residents living along its shorelines, most of whom subsist on products from their livestock and on blue-green algae and fish harvested from Lake Chad, but runs the risk of transferring an unrelated set of species into the Lake Chad basin. These proposals (Kuwairi 2004) also suggest that a scheme to divert water from the Ubangui River could be enlarged sufficiently so that additional water could be diverted via a pipeline further northwards into southern Libya. Whilst such water transfers could enhance the biodiversity of Lake Chad and its immediate surroundings, there is a strong possibility that such a scheme could have significant adverse effects on the Congo River system to the south.


Sustainable and equitable natural resource management is the key not just to the maintenance of biodiversity but equally to human development and well-being. Conservation and wildlife management has lagged behind the rest of the region, though one of Africa’s first national parks, the Virunga National Park, was created here in 1925. The costs of conservation are far from trivial. It is estimated that successful management of a minimal network of protected areas in forests alone would require an investment of over US$1 000 million over 10 years, followed by recurrent costs of nearly US$90 million per year; current investment is probably about US$15 million per year (Blom 2004).

Much of the remaining biodiversity is held outside national parks (Sayer and others 1992). Thus, broadscale resource management systems which combine protected areas with areas of increasing human use can be an important intervention. Initiatives such as the Yaoundé Process, which led to the Yaoundé Declaration in 1999, made a formal commitment to the conservation and sustainable management of tropical forests, and helped catalyse the Plan de Convergence (COMIFAC 2005), the creation of Gabon’s network of 13 national parks (Gabon National Parks undated), and the Congo Basin Forest Partnership (CBFP), consisting of 27 public and private partners (CBFP undated). USAID’s Central Africa Regional Project for the Environment (CARPE) and the European Commission’s Ecosystems Forestiers d’Afrique Centrale (ECOFAC) contribute to this partnership. An important task for the CBFP is the development of a monitoring system to provide a periodic assessment of the forest and biodiversity of the Congo basin (see Box 5).