DUTECH, Christian Cyril; JOLY, H. I.; JARNE, P.

doi:10.1038/sj.hdy.6800384

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DUTECH, Christian Cyril
Biodiversité, Gènes et Ecosystèmes [BioGeCo]
Laboratoire de Génétique et d'Ecologie Moléculaire
Centre d’Ecologie Fonctionnelle et Evolutive [CEFE]

JOLY, H. I.
Centre d’Ecologie Fonctionnelle et Evolutive [CEFE]
Centre de Coopération Internationale en Recherche Agronomique pour le Développement [Cirad]

JARNE, P.
Centre d’Ecologie Fonctionnelle et Evolutive [CEFE]

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Article de revue

Ce document a été publié dans

Heredity. 2004, vol. 92, n° 2, p. 69-77

Nature Publishing Group

Résumé en anglais

Both gene flow and historical events influence the genetic diversity of natural populations. One way to understand their respective impact is to analyze population genetic structure at large spatial scales. We studied the distribution of genetic diversity of 17 populations of Vouacapoua americana (Caesalpiniaceae) in French Guiana, using nine microsatellite loci. Low genetic diversity was observed within populations, with a mean allelic richness and gene diversity of 4.1 and 0.506, respectively, which could be due to low effective population size and/or past bottlenecks. Using the regression between Fst/(1-Fst), estimated between pairs of populations, and the logarithm of the geographical distance, the spatial genetic structure can partly be explained by isolation-by-distance and limited gene flow among populations. This result is in agreement with the species' biology, including seed and pollen dispersal by rodents and insects, respectively. In contrast, no clear genetic signal of historical events was found when examining genetic differentiation among populations in relation to biogeographical hypotheses or by testing for bottlenecks within populations. Our conclusion is that nuclear spatial genetic structure of V. americana, at the geographic scale of French Guiana, is better explained by gene flow rather than by historical events< Réduire

Mots clés

MICROSATELLITE

GENETIQUE DES POPULATIONS

Mots clés en anglais

BOTTLENECK

CLIMATIC CHANGE

EXTINCTION-RECOLONIZATION

NEOTROPICAL RAINFOREST

POLLEN AND SEED DISPERSAL

VOUACAPOUA AMERICANA