期刊
JOURNAL OF HEREDITY
卷 101, 期 6, 页码 717-726出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esq081
关键词
clonal structure; fragmentation; gene flow; genetic diversity; heterozygosity; isolation by distance
资金
- Junta de Comunidades de Castilla-La Mancha [PII1C09-0256-9052]
- Spanish Ministry of Science and Technology [CSD2008-00040, CGL2008-00095/BOS]
- JAE-Doc
- Juan de la Cierva
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 20-50 m that were particularly patent in the 2 less fragmented patches. Overall, our findings point to long-term genetic shifts in population structure of holm oaks in fragmented landscapes; however, further research is required on pollen dispersal and gene flow in this species.
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