Cross-Sanaga-Bioko coastal forests

The Cross-Sanaga-Bioko coastal forests is a tropical and subtropical moist broadleaf forests ecoregion located in the Afrotropic biogeographic realm, covering sub-Saharan Africa and the southern Arabian Peninsula, spanning approximately 51,840 km². Classified under the WWF ecoregion code AT0107, this region represents a distinct ecological community shaped by its unique combination of climate, geography, and evolutionary history.

Climate and Vegetation

This ecoregion experiences warm year-round with high annual rainfall, typically exceeding 2,000 mm. The dominant vegetation consists of dense, multi-layered canopy of broadleaf evergreen trees. These conditions create the foundation for the ecological communities found within the Cross-Sanaga-Bioko coastal forests.

Ecological Significance

These forests are the most biodiverse terrestrial ecosystems on Earth, hosting an extraordinary density of plant and animal species per unit area. Epiphytes, lianas, and a rich understorey characterise the complex vertical structure. The Cross-Sanaga-Bioko coastal forests contributes to the broader biodiversity patterns of the Afrotropic realm.

Geographic Distribution

The Cross-Sanaga-Bioko coastal forests extends across Cameroon and Nigeria. This geographic range places it within the Afrotropic realm, one of the eight major biogeographic divisions of the world.

Notable Species

The Cross-Sanaga-Bioko coastal forests supports a range of wildlife, including African Blackwood (Dalbergia melanoxylon), African Oil Bean (Pentaclethra macrophylla), African Pearwood (Baillonella toxisperma), African Teak (Milicia excelsa), Akume (Guibourtia tessmannii), Allspice (Pimenta dioica), alstonia (Alstonia boonei), Anil de pasto (Indigofera suffruticosa), and 42 more species. Among these, 3 species are classified as threatened on the IUCN Red List, underscoring the conservation importance of this ecoregion.

Conservation

Like many tropical and subtropical moist broadleaf forests ecosystems, the Cross-Sanaga-Bioko coastal forests faces threats from deforestation, agricultural expansion, logging, and climate change. Conservation efforts in this ecoregion focus on habitat preservation, sustainable land management, and protecting corridors that connect fragmented habitat patches.