Cross-Niger transition forests

AT0106 Afrotropic Tropical & Subtropical Moist Broadleaf Forests 20629 km²

The Cross-Niger transition 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 20,629 km². Classified under the WWF ecoregion code AT0106, 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-Niger transition 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-Niger transition forests contributes to the broader biodiversity patterns of the Afrotropic realm.

Geographic Distribution

The Cross-Niger transition forests extends entirely within Nigeria. This geographic range places it within the Afrotropic realm, one of the eight major biogeographic divisions of the world.

Notable Species

The Cross-Niger transition forests supports a range of wildlife, including (Vibrio cholerae), Anil de pasto (Indigofera suffruticosa), Apple blossom (Cassia javanica), Arsenic bush (Senna septemtrionalis), Asian Tiger Mosquito (Aedes albopictus), Avian malaria (Plasmodium relictum), Balloon cotton bush (Gomphocarpus physocarpus), Black mimosa (Mimosa pigra), and 42 more species.

Conservation

Like many tropical and subtropical moist broadleaf forests ecosystems, the Cross-Niger transition 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.