Animal Systematics, Evolution and Diversity

The Korean Society of Systematic Zoology (한국동물분류학회)
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Mitochondrial DNA Sequence Variations and Genetic Relationships among Korean Thais Species (Muricidae: Gastropoda)

  • Lee, Sang-Hwa (Graduate Program in Cell Biology and Genetics and Department of Parasitology, College of Medicine, Chungbuk National University) ;
  • Kim, Tae-Ho (Department of Plant Medicine, College of Agriculture, Life, and Environmental Sciences, Chungbuk National University) ;
  • Lee, Jun-Hee (Graduate Program in Cell Biology and Genetics and Department of Parasitology, College of Medicine, Chungbuk National University) ;
  • Lee, Jong-Rak (Marine Biodiversity Research Institute, INTHESEA KOREA Inc.) ;
  • Park, Joong-Ki (Graduate Program in Cell Biology and Genetics and Department of Parasitology, College of Medicine, Chungbuk National University)
  • Received : 2011.01.14
  • Accepted : 2011.03.03
  • Published : 2011.03.31
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Abstract

Thais Roding, 1798, commonly known as rock-shell, is among the most frequently found gastropod genera worldwide on intertidal rocky shores including those of Japan, China, Taiwan and Korea. This group contains important species in many marine environmental studies but species-level taxonomy of the group is quite complicated due to the morphological variations in shell characters. This study examined the genetic variations and relationships among three Korean Thais species based on the partial nucleotide sequences of mitochondrial cox1 gene fragments. Phylogenetic trees from different analytic methods (maximum parsimony, neighbor-joining, and maximum likelihood) showed that T. bronni and T. luteostoma are closely related, indicating the most recent common ancestry. The low sequence divergence found between T. luteostoma and T. bronni, ranging from 1.53% to 3.19%, also corroborates this idea. Further molecular survey using different molecular marker is required to fully understand a detailed picture of the origin for their low level of interspecific sequence divergence. Sequence comparisons among conspecific individuals revealed extensive sequence variations within the three species with maximum values of 2.43% in T. clavigera and 1.37% in both T. bronni and T. luteostoma. In addition, there is an unexpectedly high level of mitochondrial genotypic diversity within each of the three Korean Thais species. The high genetic diversity revealed in Korean Thais species is likely to reflect genetic diversity introduced from potential source populations with diverse geographic origins, such as Taiwan, Hong Kong, and a variety of different coastal regions in South China and Japan. Additional sequence analysis with comprehensive taxon sampling from unstudied potential source populations will be also needed to address the origin and key factors for the high level of genetic diversity discovered within the three Korean Thais species studied.

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References

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