Phylogenomic approaches reveal how climate shapes patterns of genetic diversity in an African rain forest tree species.

Autor: Helmstetter AJ; IRD, UMR DIADE, Université de Montpellier, Montpellier, France., Amoussou BEN; IRD, UMR DIADE, Université de Montpellier, Montpellier, France.; Faculté des Sciences Agronomiques, Université d'Abomey-Calavi, Cotonou, Benin., Bethune K; IRD, UMR DIADE, Université de Montpellier, Montpellier, France., Kamdem NG; Laboratoire de Botanique Systématique et d'Ecologie, Département des Sciences Biologiques, Ecole Normale Supérieure, Université de Yaoundé I, Yaoundé, Cameroon., Glèlè Kakaï R; Laboratoire de Biomathématiques et d'Estimations Forestières, Université d'Abomey-Calavi, Cotonou, Bénin., Sonké B; Laboratoire de Botanique Systématique et d'Ecologie, Département des Sciences Biologiques, Ecole Normale Supérieure, Université de Yaoundé I, Yaoundé, Cameroon., Couvreur TLP; IRD, UMR DIADE, Université de Montpellier, Montpellier, France.; Laboratoire de Botanique Systématique et d'Ecologie, Département des Sciences Biologiques, Ecole Normale Supérieure, Université de Yaoundé I, Yaoundé, Cameroon.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2020 Sep; Vol. 29 (18), pp. 3560-3573. Date of Electronic Publication: 2020 Aug 20.
DOI: 10.1111/mec.15572
Abstrakt: 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.
(© 2020 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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