Genetic consequences of habitat fragmentation in long-lived tree species: the case of the mediterranean Holm Oak (Quercus ilex, L.)

The Journal of Heredity
Joaquín OrtegoAlberto Muñoz

Abstract

Large-scale forest fragmentation can increase interpopulation genetic differentiation and erode the genetic variability of remnant plant populations. In this study, we analyze the extent of clonality and the genetic variability and structure within a holm oak (Quercus ilex) population from Central Spain at 3 patches showing different degrees of fragmentation. For this purpose, we have typed 191 individuals (105 adults and 86 saplings) at 9 microsatellite loci. Microsatellite markers revealed an extensive clonal structure in this species, with most analyzed clumps constituting a single "genet", which in some cases extended over a considerable area (up to 318 m(2)). The maximum distance between "ramets" tended to be higher in the extremely fragmented patch, suggesting that intensive management and environmental perturbation has favored clonal propagation. We have also found evidence that fragmentation has contributed to reduce genetic variability and increase genetic differentiation in holm oak saplings, indicating that the younger cohorts are suffering some negative genetic consequences of long-term population fragmentation. Finally, analyses of fine spatial genetic structure have revealed significant kinship structures up to 20...Continue Reading

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Citations

Oct 31, 2012·The Journal of Heredity·Richard S DoddZara Afzal-Rafii
Jul 27, 2012·Conservation Biology : the Journal of the Society for Conservation Biology·V J Tepedino
Aug 15, 2013·American Journal of Botany·M Luisa Herrera-ArroyoKen Oyama

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