Effect of insect-mediated dispersal on the genetic structure of postglacial water mite populations

Article Abstract:

Effects of insect-mediated dispersal on genetic structure of postglacial water mite populations of Arrenurus from northeastern North America have been studied and results indicate allozyme population structure is mostly the result of historical patterns in the regions in question. Results of comparisons with sister species indicate a likely limited role for dispersal in homogenizing populations genetically, even with drift-gene flow equilibrium not achieved. For the mite larvae, eight taxa are obligate parasites of winged adult insects. The insects are the main means of dispersal for those taxa. Three species have lost ability to parasitize the insects, and in them very low allozyme heterozygosity was seen

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Allozyme variation and genetic structure of Calluna vulgaris (heather) populations in Scotland: the effect of postglacial recolonization

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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Evidence for spatial structure and directional gene flow in a population of an aquatic plant, Potamogeton coloratus

Article Abstract:

Evidence for directional gene flow and spatial structure in a population of an aquatic plant, Potamogeton coloratus, are discussed based on a study of 647 samples from 60 ditches in the Gordano Valley, Somerset, and analysis for variation at two polymorphic PGM isoenzyme loci. Genetic subdivision of the population and greater diversity downstream and downwind were attributed to genetic bottlenecks having to do with ditch cleaning and later directional geneflow mediated by wind/water currents.

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