Kinoshita G., Nunome M., Kryukov A. P., Kartavtseva I. V., Han S-H., Yamada F., Suzuki H.
В издании Modern Achievements in Population, Evolutionary and ecological Genetics: Program and Abstract of International Symposium
Год: 2015 Страницы: 40
Introgressive hybridization is not rare phenomenon among closely rerated and neighboring species, which can confuse the estimate of real phylogenetic relationships, but inferring important histories of demographic and intra-species interactions. The genus Lepus is an appropriate model because approximately 30 species are recognized from variable habitats across North America, Asia, Europe, and Africa, and more than 10 species are involved in introgressive hybridizations. However, the most of studies have been done in European vs. North American species, and phylogenetic relationships and extent of introgression of northeastern Asian species have not been surveyed. We examined phylogenetic relationships among four hare species (L. timidus, L. mandshuricus, L. coreanus, and L. brachyurus) from Russia, Korea and Japan using sequences of eight nuclear gene loci (Mgf, Tg, Tshb, Sptbn1, Mc1r, Asip, Phka2, and Sry) and Cytb of mtDNA, with database sequences of other populations and neighboring species (L. capensis and L. sinensis) in China. Phylogenetic analyses showed multiple introgression of nuclear and mitochondrial genes among continental hare species, showing variety in genomic loci, species pairs, locality, and geographic patterns of the distribution of the introgressed lineage. An extreme case of introgression is observed in the L. mandshuricus complex (L. mandshuricus and L. coreanus), which has lost the original mtDNA lineage due to replacement by introgressed lineages from the northern species L. timidus and the southern species L. sinensis. In contrast, no evidence of introgression across genomes to insular populations of L. timidus in Sakhalin and Hokkaido exists, or of the participation of L. brachyurus in Japan in the reticulate evolution. Climatic changes during the Pleistocene promote distribution shifts and the reticulate evolution of hares in continental northeastern Asia, but long-term isolation on the marginal islands after colonization.
