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Colonization processes and the maintenance of genetic diversity: insights from a pioneer rainforest tree, Aucoumea klaineana.

Authors
  • Born, Céline
  • Kjellberg, Finn
  • Chevallier, Marie-Hélène
  • Vignes, Hélène
  • Dikangadissi, Jean-Toussaint
  • Sanguié, Jodel
  • Wickings, E Jean
  • Hossaert-McKey, Martine
Type
Published Article
Journal
Proceedings. Biological sciences / The Royal Society
Publication Date
Sep 22, 2008
Volume
275
Issue
1647
Pages
2171–2179
Identifiers
DOI: 10.1098/rspb.2008.0446
PMID: 18559325
Source
Medline
License
Unknown

Abstract

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.

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