Abstract:
:The world's second largest expanse of tropical rainforest is in Central Africa, and it harbours enormous species diversity. Population genetic studies have consistently revealed significant structure across Central African rainforest plants. In particular, previous studies have repeatedly demonstrated a north-south genetic discontinuity around the equatorial line, in a continuous expanse of rainforest where a climatic inversion is documented. Here, we took a phylogeographic approach by sequencing 351 nuclear markers in 112 individuals across the distribution of the African rainforest tree species Annickia affinis (Annonaceae). We showed for the first time that the north-south divide is the result of a single, major colonization event across the climatic inversion from an ancestral population located in Gabon. We suggested that differences in ecological niche of populations located on either side of this inversion may have contributed to this phylogenetic discontinuity. We found evidence for inland dispersal, predominantly in northern areas, and variable demographic histories among genetic clusters, indicating that populations responded differently to past climate change. We show how newly developed genomic tools can provide invaluable insights into our understanding of tropical rainforest evolutionary dynamics.
journal_name
Mol Ecoljournal_title
Molecular ecologyauthors
Helmstetter AJ,Amoussou BEN,Bethune K,Kamdem NG,Glèlè Kakaï R,Sonké B,Couvreur TLPdoi
10.1111/mec.15572subject
Has Abstractpub_date
2020-09-01 00:00:00pages
3560-3573issue
18eissn
0962-1083issn
1365-294Xjournal_volume
29pub_type
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