Genetic Diversity in African Rainforest Ecosystems
Summary
African rainforests harbour some of the world’s richest reservoirs of genetic variation, underpinning ecosystem resilience, evolutionary potential and the provision of ecosystem services. This diversity manifests across spatial scales—from allelic variation within populations to deep phylogenetic splits among genera—shaped by a complex interplay of past climate oscillations, geomorphological barriers and ecological gradients. Pleistocene glacial cycles induced forest contractions into refugial pockets, promoting population fragmentation and local adaptation. Subsequent post-glacial expansion and secondary contact generated zones of high genetic admixture, while persistent barriers such as the Dahomey Gap and the Cameroon Volcanic Line have maintained distinct gene pools. Both organellar and nuclear markers have revealed cryptic lineages in economically important timber and non-timber species, emphasising underestimated endemic diversity. Polyploidy events, biome shifts and hybridisation further contribute to the evolutionary tapestry of Guineo-Congolian forests. Understanding these patterns is critical for targeted conservation planning, sustainable resource management and for harnessing genetic resources in restoration and breeding programmes aimed at mitigating the impacts of climate change and habitat loss.
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Genetic Diversity in African Rainforest Ecosystems publication trend
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Technical terms
Allele: A variant form of a gene at a particular locus in the genome.
Phylogeography: The study of the historical processes that shape the geographic distributions of genetic lineages.
Ploidy: The number of complete sets of chromosomes in a cell, e.g. diploid (two sets) or tetraploid (four sets).
Refugium: A location where populations persist through adverse climatic periods, maintaining genetic diversity.
Haplotype: A combination of alleles or sequence variants at adjacent loci on a single chromosome transmitted together.
References
- Miocene Diversification in the Savannahs Precedes Tetraploid Rainforest Radiation in the African Tree Genus Afzelia (Detarioideae, Fabaceae). Frontiers in Plant Science (2020).
- Nuclear ribosomal phylogeny of Brachystegia: new markers for new insights about rain forests and Miombo woodlands evolution. Plant Ecology and Evolution (2022).
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