Long-distance seed and pollen dispersal inferred from spatial genetic structure in the very low-density rainforest tree, Baillonella toxisperma Pierre, in Central Africa

Autor: Ndiade-Bourobou, D., Hardy, O. J., Favreau, B., Moussavou, H., Nzengue, E., Mignot, Agnès, Bouvet, J.-M.
Přispěvatelé: Centre national de la recherche scientifique et technologique (CENAREST), Diversité génétique et amélioration des espèces forestières (UPR Génétique forestière), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Service Evolution Biologique et Ecologie, Université libre de Bruxelles (ULB), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Molecular Ecology
Molecular Ecology, Wiley, 2010, 19 (22), pp.4949-4962. ⟨10.1111/j.1365-294X.2010.04864.x⟩
ISSN: 0962-1083
1365-294X
Popis: International audience; We analysed the spatial distribution of genetic diversity to infer gene flow for Baillonella toxisperma Pierre (Moabi), a threatened entomophilous pollinated and animal-dispersed Central African tree, with typically low density (5-7 adults trees/km(2)). Fifteen nuclear and three universal chloroplast microsatellites markers were used to type 247 individuals localized in three contiguous areas with differing past logging intensity. These three areas were within a natural forest block of approximately 2886 km(2) in Gabon. Expected heterozygosity and chloroplast diversity were He-nuc = 0.570 and H-cp = 0.761, respectively. F-IS was only significant in one area (F-IS = 0.076, P < 0.01) and could be attributed to selfing. For nuclear loci, Bayesian clustering did not detect discrete gene pools within and between the three areas and global differentiation (F-STnuc = 0.007, P > 0.05) was not significant, suggesting that they are one population. At the level of the whole forest, both nuclear and chloroplast markers revealed a weak correlation between genetic relatedness and spatial distance between individuals: Sp(nuc) = 0.003 and Sp(cp) = 0.015, respectively. The extent of gene flow (sigma) was partitioned into global gene flow (sigma(g)) from 6.6 to 9.9 km, seed dispersal (sigma(s)) from 4.0 to 6.3 km and pollen dispersal (sigma(p)) from 9.8 to 10.8 km. These uncommonly high dispersal distances indicate that low-density canopy trees in African rainforests could be connected by extensive gene flow, although, given the current threats facing many seed disperser species in Central Africa, this may no longer be the case.
Databáze: OpenAIRE
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