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6 results for “Guibourtia”
Highlighting convergent evolution in morphological traits in response to climatic gradient in African tropical tree species: the case of genus Guibourtia Benn
<ol> <li><span>Adaptive evolution is a major driver of organism diversification but the links between phenotypic traits and environmental niche remains 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 (1) convergent evolution if different environmental conditions have selected different sets of traits, and/or (2) 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. </span></li> <li><span>This issue was addressed with the tree genus <i>Guibourtia </i>Benn. (Leguminosae, 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 <i>Guibourtia</i> species. </span></li> <li><span>First, we demonstrated phylogenetic signals in both morphological traits (Mantel test between phylogenetic and morphological distances between species: r=0.24, p=0.031) and environmental niches (Mantel test between phylogenetic and niche distances between species: r=0.23, p=0.025). Second, we found a significant correlation between morphology and niche, at least between some of their respective dimensions (Mantel's r=0.32, p=0.013), even after accounting for phylogenetic inertia (Phylogenetic Independent Contrast: r=0.69, p=0.018). This correlation occurred between some leaflet and flower traits and solar radiation, relative humidity, precipitations and temperature range. </span></li> <li><span>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.</span></li> </ol>
FIGURE. Selected species from the flora of Quiçama National Park. A. Adansonia digitata. B. Euphorbia candelabrum. C. Acacia welwitschii. D. Hyphaene guineensis. E. Rhizophora racemosa. F. Guibourtia carrissoana var. gossweileri. G. Tessmannia camoneana. H. Sterculia setigera. I. Carissa spinarum. J. Boscia urens. K. Maerua angolensis. L. Grewia villosa. M. Sesuvium crithmoides. N. Aloe zebrina. O. Barleria elegans. P. Setaria welwitschii. (Photographs by the authors). in An annotated checklist of the vascular flora of Quiçama National Park, Angola
FIGURE. Selected species from the flora of Quiçama National Park. A. Adansonia digitata. B. Euphorbia candelabrum. C. Acacia welwitschii. D. Hyphaene guineensis. E. Rhizophora racemosa. F. Guibourtia carrissoana var. gossweileri. G. Tessmannia camoneana. H. Sterculia setigera. I. Carissa spinarum. J. Boscia urens. K. Maerua angolensis. L. Grewia villosa. M. Sesuvium crithmoides. N. Aloe zebrina. O. Barleria elegans. P. Setaria welwitschii. (Photographs by the authors).
FIGURE 3. Guibourtia hymenaeifolia. A in Revisiting The Taxonomic Diversity Of Guibourtia In The Neotropics (Leguminosae, Detarioideae)
FIGURE 3. Guibourtia hymenaeifolia. A. branch with inflorescences and immature fruits; B. leaflet and detail of the abaxial surface; C. floral bud; D. flower; E. detail of the glabrous ovary; F. immature fruit (A–F: E. L. Ekman 6203(U)) Drawn by Klei Souza.
FIGURE 2. Guibourtia chodatiana. A in Revisiting The Taxonomic Diversity Of Guibourtia In The Neotropics (Leguminosae, Detarioideae)
FIGURE 2. Guibourtia chodatiana. A. branch with inflorescences; B. leaflet and detail of the abaxial surface; C. floral bud; D. flower; E. immature fruits; F. detail of the epicarp; G. dehiscent fruits; H. fruit with the exposed seed and aril; I. seed (A–C: R. R. Silva & M. V. Silva 1278 (UEC); D: Bernardi 18946 (U); E–I: R. R. Silva & J. S. Velásquez 1222 (UEC)) Drawn by Klei Souza.
Highlighting convergent evolution in morphological traits in response to climatic gradient in African tropical tree species: the case of genus Guibourtia Benn
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FIGURE 1 in Revisiting The Taxonomic Diversity Of Guibourtia In The Neotropics (Leguminosae, Detarioideae)
FIGURE 1. Distribution map of the Neotropical Guibourtia species.
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