Article Abstract:
The effect of postglacial recolonization on allozyme variation and genetic structure of Calluna vulgaris (heather) populations in Scotland is discussed based on study of populations in a landscape glaciated at one time and now with low fragmentation levels vs continental regions. Genetic differentiation was low and consistent geographical patterns were not found at the regional level, so a high rate of gene flow was likely favored by the almost continuous range of the plant across Scotland and by environmental factors in the country.
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Article Abstract:
Patterns of allozymic variation within Calluna vulgaris populations have been studied at the adult stage and at the seed bank stage, and at seven allozyme loci studied, averaged over the two plots, the two shrub populations had genetic diversity levels that were very alike. The seed bank seems to preserve genetic diversity at a very local scale. It seems current limitation of seed dispersal, not spatial extension of clones, is the basis for local genetic structure.
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Article Abstract:
Isolation by distance in a continuous population is discussed relative to reconciliation of spatial autocorrelation analysis with population genetics models. Topics include relationships between a descriptor of the spatial genetic structure used in empirical studies, the I statistic, the coefficient of relationship, and population genetics parameters.
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