Geographic Variation of Mus Caroli from East and Southeast Asia Based on Mitochondrial Cytochrome B Gene Sequences
Mammal Study 28: 67–72 (2003) © the Mammalogical Society of Japan Geographic variation of Mus caroli from East and Southeast Asia based on mitochondrial cytochrome b gene sequences Mie Terashima1, Agustinus Suyanto2, Kimiyuki Tsuchiya3, Kazuo Moriwaki4, Mei-Lei Jin5 and Hitoshi Suzuki1,* 1 Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan 2 Research Centre for Biology, Indonesian Institute of Sciences, Cibinong 16911, Indonesia 3 Department of Agriculture, Tokyo University of Agriculture, Atsugi 243-0034, Japan 4 RIKEN, Bioresource Center, Tsukuba, Ibaraki 305-0074, Japan 5 Shanghai Research Center of Biotechnology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200233, China Abstract. We examined intraspecific genetic variation in the mitochondrial cytochrome b gene (1140 bp) in the Okinawa mouse, Mus caroli (Rodentia, Muridae), from Okinawa, Taiwan, Hainan, Yunnan (southern China), Thailand, Vietnam and Java, to better understand their evolutionary history and human impact on dispersal and colonization by the mice. Populations from each of the seven localities had distinctive mitochondrial DNA sequences. The genetic distances, ranging from 0.015 to 0.045 (0.033 on average), were comparable with inter-subspecies differences in the house mouse Mus musculus (0.024). Assuming that nucleotide substitutions occur at a constant rate of 0.024/million years/lineage for mitochondrial DNA, the divergence of in M. caroli is estimated to have occurred 0.3–0.9 million years ago. The relatively great extent of intraspecific mitochondrial DNA variation in this taxon, and the spatial mode of variation suggest that M. caroli is genetically structured in space, to a considerable extent.
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