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http://dx.doi.org/10.5352/JLS.2009.19.6.711

Population Genetic Structure of Octopus minor Sasaki from Korea and China Based on a Partial Sequencing of Mitochondrial 16S rRNA  

Kim, Joo-Il (South Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Oh, Taeg-Yun (South Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Seo, Young-Il (South Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Cho, Eun-Seob (South Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Publication Information
Journal of Life Science / v.19, no.6, 2009 , pp. 711-719 More about this Journal
Abstract
We determined a portion of mitochondrial 16S rRNA gene sequences (416 bp) to investigate the genetic structure of the octopus (Octopus minor Ssaki) population in Korea and China. Samples were obtained from Korea (Yeosu, Namhae, Jindo, Muan, Geomundo and Seosan) and China (Sandong) during the period of August 2006 to September 2007. Sequence analyses of 28 individual specimens collected from 7 localities revealed 11 haplotypes, ranging in a sequence divergence of 0.2% - 1.2%. Phylogenetic analyses using PHYLIP and networks subdivided the octopus into two clades (termed clade A and B) and the nucleotide divergence between them was 0.4%. This haplotype subdivision was in accordance with geographic separation: one at Yeosu, Namhae, Muan and Jindo, and the other at Seosan, Geomundo and Sandong. On the basis of hierarchial genetic analysis, genetic distance between localities in Korea and China were also found, but a significant population differentiation was not shown in this study (p>0.05). Consequently, most of the octopus populations in Korea had considerable distribution due to the mitochondrial gene flow that resulted in a formation of a genetically homogenous structure, whereas some of the Korean and Chinese populations had different genetic structures. Gene flow among populations may be restricted due to impassable geographic barriers that promote genetic differentiation.
Keywords
Gene flow; mitochondrial DNA; octopus; population structure;
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