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Évolution du genre sexuel et de la diversité génétique dans une succession primaire : l'étude d'Antirhea Borbonica (rubiaceae) sur les coulées de lave à la Réunion

Abstract : On La Réunion, volcanic éruptions create a tropical forest fragmentation. In this area a gradient of primary succession associated with plant colonisation on lava flows can be identified. We examined thé variability of thé reproductive System and thé genetic diversity in relation to thé ecological processes associated with colonisation and succession. Antirhea borbonica, is a pioneer species which persists into late-successional habitats. This species shows marked variation in thé expression of dioecy. This variation is due to resource limitation in early-succession. Our theoretical models predict that thé gender variation could represent an adaptive plasticity. However, in spite of polliniferous morph fructification, ail populations of this species are close to strict functional dioecy. So, thé high inbreeding coefficients are no due to selfmg and they are probably thé resuit of a Wahlund effect associated with thé colonisation process in primary succession.
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https://tel.archives-ouvertes.fr/tel-00545826
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Submitted on : Monday, December 13, 2010 - 9:19:23 AM
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  • HAL Id : tel-00545826, version 1

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Isabelle Litrico. Évolution du genre sexuel et de la diversité génétique dans une succession primaire : l'étude d'Antirhea Borbonica (rubiaceae) sur les coulées de lave à la Réunion. Ecologie, Environnement. Université de la Réunion, 2004. Français. ⟨NNT : 2004lare0025⟩. ⟨tel-00545826⟩

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