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Homologous recombination between bacterial strains is theoretically capable of preventing the separation of daughter clusters, and producing cohesive clouds of genotypes in sequence space. However, numerous barriers to recombination are known. Barriers may be essential such as adaptive incompatibility, or ecological, which is associated with the opportunities for recombination in the natural habitat...
Marine fish species are characterized by a low degree of population differentiation at putatively neutral marker genes. This has been traditionally attributed to ecological homogeneity and a lack of obvious dispersal barriers in marine habitats, as well as to the large (effective) population sizes of most marine fish species. The herring (Clupea harengus) is a case in point – the levels of population...
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