Article (Scientific journals)
Relationships between population density, fine-scale genetic structure, mating system and pollen dispersal in a timber tree from African rainforests
Duminil, Jérôme; Daïnou, Kasso; Kaviriri, D.K. et al.
2016In Heredity, 116, p. 295-303
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Keywords :
Population density; Fine-scale genetic structure; Mating system; Pollen dispersal; Erythrophleum suaveolens; Timber tree
Abstract :
[en] Owing to the reduction of population density and/or the environmental changes it induces, selective logging could affect the demography, reproductive biology and evolutionary potential of forest trees. This is particularly relevant in tropical forests where natural population densities can be low and isolated trees may be subject to outcross pollen limitation and/or produce low-quality selfed seeds that exhibit inbreeding depression. Comparing reproductive biology processes and genetic diversity of populations at different densities can provide indirect evidence of the potential impacts of logging. Here, we analysed patterns of genetic diversity, mating system and gene flow in three Central African populations of the self-compatible legume timber species Erythrophleum suaveolens with contrasting densities (0.11, 0.68 and 1.72 adults per ha). The comparison of inbreeding levels among cohorts suggests that selfing is detrimental as inbred individuals are eliminated between seedling and adult stages. Levels of genetic diversity, selfing rates (∼16%) and patterns of spatial genetic structure (Sp ∼ 0.006) were similar in all three populations. However, the extent of gene dispersal differed markedly among populations: the average distance of pollen dispersal increased with decreasing density (from 200m in the high-density population to 1000m in the low-density one). Overall, our results suggest that the reproductive biology and genetic diversity of the species are not affected by current logging practices. However, further investigations need to be conducted in low-density populations to evaluate (1) whether pollen limitation may reduce seed production and (2) the regeneration potential of the species.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Duminil, Jérôme
Daïnou, Kasso  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Kaviriri, D.K.
Gillet, Pauline ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
Loo, J.
Doucet, Jean-Louis ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Hardy, O.J.
Language :
English
Title :
Relationships between population density, fine-scale genetic structure, mating system and pollen dispersal in a timber tree from African rainforests
Publication date :
March 2016
Journal title :
Heredity
ISSN :
0018-067X
eISSN :
1365-2540
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
116
Pages :
295-303
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 17 February 2016

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