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Yoon, Myung-Hee,Phillips, Carleton. J.,Kim, Iksoo,Oh, Hong Sik 한국유전학회 2004 Genes & Genomics Vol.26 No.1
The biogeography and population genetic structure in the striped field mouse, Apodemus agrarius, were investigated on the southern Korean mainland, coastal islets of Wan, Keoje, and Kaduk, and the offshore island, Cheju. DNA sequences from the mitochondrial cytochrome b protein-coding gene were used to test hypotheses based on previous investigations of these mice. We found 28 mtDNA-sequence-based haplotypes with maximum divergence of 2.0%. A PAUP analysis revealed at least six lineages with a southwest (Cheju Island) to northeast (the Korean mainland) polarity, The hypothesized oldest haplotypes were obtained on Cheju Island. Considering of the data in context of Late Pleistocent-Holocene landforms suggests that present-day Cheju Island is the remant of a refugium for A. agrarius. The Wan and Keoje islet haplotypes were monophyletic, whereas those on Cheju Island were not. In the broad view, significant genetic structuring was found among Cheju Island, islets, and mainland, but on the mainland itself there was no regional structuring. Genetic distance estimates suggest weak dispersal capability across narrow (< 2 km) coastal water gaps, but reprocuctive isolating mechanisms offer an alternative explanation. Overall, the data set is consistent with an earlier hypothesis that speciation has occurred, but our interpretation is that mainland A. agrarius coreae was derived from a coastal islet and offshore species, A. "chejuensis." This conclusion is a rare instance in which present-day island populations were the source of a mainland species.