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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Colonization processes and the maintenance of genetic diversity: Insights from a pioneer rainforest tree, Aucoumea klaineana
Proceedings of the Royal Society B: Biological Sciences, Volume 275, No. 1647, Year 2008
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Description
Despite recurrent episodes of range expansion and contraction, forest trees often harbour high genetic diversity. Studies of temperate forest trees suggest that prolonged juvenile phase and high pollen flow are the main factors limiting founder effects. Here, we studied the local colonization process of a pioneer rainforest tree in central Africa, Aucoumea klaineana. We identified 87% of parents among trees up to 20-25 years old and could thus compare direct parentage structure data with classical population genetics estimators.In this species, genetic diversity was maintained during colonization. The absence of founder effects was explained by (i) local random mating and (ii) local recruitment, as we showed that 75% of the trees in the close neighbourhood participated in the recruitment of new saplings. Long-distance pollen flow contributed little to genetic diversity: pollen and seed dispersal was mainly within stand (128 and 118 m, respectively). Spatial genetic structure was explained by aggregated seed dispersal rather than by mother-offspring proximity as assumed in classical isolation-by-distance models.Hence, A. klaineana presents a genetic diversity pattern typical of forest trees but does not follow the classical rules by which this diversity is generally achieved. We suggest that while high local genetic variability is of general importance to forest tree survival, the proximate mechanisms by which it is achieved may follow very different scenarios. © 2008 The Royal Society.
Authors & Co-Authors
Born, Céline
Gabon, Franceville
Centre International de Recherches Medicales de Franceville
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
Kjellberg, Finn
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
Chevallier, Marie Hélène
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
France, Paris
Cirad
Vignes, Hélène
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
France, Paris
Cirad
Dikangadissi, Jean Thoussaint
Gabon, Franceville
Centre International de Recherches Medicales de Franceville
Sanguié, Jodel
Gabon, Franceville
Centre International de Recherches Medicales de Franceville
Wickings, Elisabeth Jean
Gabon, Franceville
Centre International de Recherches Medicales de Franceville
Hossaert-McKey, Martine M.
France, Montpellier
Centre D’ecologie Fonctionnelle et Evolutive
Statistics
Citations: 43
Authors: 8
Affiliations: 3
Identifiers
Doi:
10.1098/rspb.2008.0446
ISSN:
09628452
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study