Reference : Highlighting convergent evolution in morphological traits in response to climatic gra...
Scientific journals : Article
Life sciences : Environmental sciences & ecology
Highlighting convergent evolution in morphological traits in response to climatic gradient in African tropical tree species: The case of genus Guibourtia Benn.
Tosso, Dji-ndé Félicien mailto [Forest is Life, TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium]
Doucet, Jean-Louis mailto [Université de Liège - ULiège > Département GxABT > Laboratoire de Foresterie des régions trop. et subtropicales >]
Daïnou, Kasso mailto [Université de Liège - ULiège > Département GxABT > Laboratoire de Foresterie des régions trop. et subtropicales >]
Fayolle, Adeline mailto [Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels >]
Hambuckers, Alain mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale >]
Doumenge, Charles [Herbarium, Botanic Garden Meise, Meise, Belgium]
Agbazahou, Honoré [> >]
Stoffelen, Piet [> >]
Hardy, Olivier J. [> >]
Ecology and Evolution
Yes (verified by ORBi)
United Kingdom
[en] Evolutionary ecology ; Guibourtia ; Niche comparison ; Phenotypic adaptation ; Phylogenetic Independent Contrast ; Speciation ; Phylogenetic signal ; Taxonomy
[en] Adaptive evolution is a major driver of organism diversification, but the links between phenotypic traits and environmental niche remain little documented in tropical trees. Moreover, trait-niche relationships are complex because a correlation between the traits and environmental niches displayed by a sample of species may result from (a) convergent evolution if different environmental conditions have selected different sets of traits, and/or (b) phylogenetic inertia if niche and morphological differences between species are simply function of their phylogenetic divergence, in which case the trait-niche correlation does not imply any direct causal link. Here, we aim to assess the respective roles of phylogenetic inertia and convergent evolution in shaping the differences of botanical traits and environmental niches among congeneric African tree species that evolved in different biomes. This issue was addressed with the tree genus Guibourtia Benn. (Leguminosae and Detarioideae), which contains 13 African species occupying various forest habitat types, from rain forest to dry woodlands, with different climate and soil conditions. To this end, we combined morphological data with ecological niche modelling and used a highly resolved plastid phylogeny of the 13 African Guibourtia species. First, we demonstrated phylogenetic signals in both morphological traits (Mantel test between phylogenetic and morphological distances between species: r =.24, p =.031) and environmental niches (Mantel test between phylogenetic and niche distances between species: r =.23, p =.025). Second, we found a significant correlation between morphology and niche, at least between some of their respective dimensions (Mantel's r =.32, p =.013), even after accounting for phylogenetic inertia (Phylogenetic Independent Contrast: r =.69, p =.018). This correlation occurred between some leaflet and flower traits and solar radiation, relative humidity, precipitations, and temperature range. Our results demonstrate the convergent evolution of some morphological traits in response to climatic factors in congeneric tree species and highlight the action of selective forces, along with neutral ones, in shaping the divergence between congeneric tropical plants. © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture ; FFEM - Fonds Français pour l'Environnement Mondial

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