Demographic history and the low genetic diversity in Dipteryx alata (Fabaceae) from Brazilian Neotropical savannas
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Data
2013
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Resumo
Genetic effects of habitat fragmentation may be undetectable because they are generally a recent event in evolutionary time or
because of confounding effects such as historical bottlenecks and historical changes in species’ distribution. To assess the
effects of demographic history on the genetic diversity and population structure in the Neotropical tree Dipteryx alata
(Fabaceae), we used coalescence analyses coupled with ecological niche modeling to hindcast its distribution over the last
21 000 years. Twenty-five populations (644 individuals) were sampled and all individuals were genotyped using eight
microsatellite loci. All populations presented low allelic richness and genetic diversity. The estimated effective population size
was small in all populations and gene flow was negligible among most. We also found a significant signal of demographic
reduction in most cases. Genetic differentiation among populations was significantly correlated with geographical distance.
Allelic richness showed a spatial cline pattern in relation to the species’ paleodistribution 21 kyr BP (thousand years before
present), as expected under a range expansion model. Our results show strong evidences that genetic diversity in D. alata is the
outcome of the historical changes in species distribution during the late Pleistocene. Because of this historically low effective
population size and the low genetic diversity, recent fragmentation of the Cerrado biome may increase population
differentiation, causing population decline and compromising long-term persistence.
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Cerrado biome, Ecological niche modeling, Coalescence, Effective population size, Gene flow, Population structure
Citação
Collevatti, R. G. et al. Demographic history and the low genetic diversity in Dipteryx alata (Fabaceae) from Brazilian Neotropical savannas. Heredity, Edinburgh, v. 1110, p. 97-105, 2013.