Article Abstract:
Genetic structuring and gene flow in a hybrid zone between two chromosome races of the common shrew, Sorex araneus, have been studied in Sweden using six polymorphic microsatellite loci. Hybrid zones between chromosome races are interesting because they give an opportunity to study chromosome role in speciation processes. In the studied shrews the narrow hybrid zone has at its center a river, and race-specific chromosomes decrease sharply with closeness to the physical barrier. Genetic structuring in the two chromosome races and between them seemed weak, but was significant. Genetic and geographical distance did not show positive correlation. It appears that the river is not important in cutting down introgression.
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Article Abstract:
Researchers used polymorphisms to examine the breeding structure of three species of snow pool Aedes mosquitoes across three river drainages in northern Colorado. To test for isolation by distance, researchers plotted values between pairs of pools against geographical distances and subjected them to a Mantel test with 1000 random permutations. They found that seasonal differences in adult emergence may serve as barriers to migration among A. pullatus and A. cataphylla populations.
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Article Abstract:
Research has been carried out on 15 allozyme loci in 32 populations of Larix taxa, or Siberian larches, across their northern Eurasian range. Results indicate population genetic differences within taxa varied from 2.6% to 8.1% based on taxon. Some of the studied species are genetically close to L. gmelinii and L. olgensis, coming from introgressive hybridization of the two species.
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