북태평양 연어의 계군구조 및 진화 역사

Abstract

Chum salmon populations are widely distributed in the North Pacific. To find influence of historical events on population genetic structure of the North Pacific chum salmon, we analyzed the 730bp region of mtDNA, COIII-ND3-ND4L, from a total of 201 individuals, 48 from Korea, 44 from Japan, 45 from Alaska, 29 from Canada, 20 from the United States and 15 from Russia. These sequences comprised 51 different haplotypes. There were four major haplotypes: haplotype A was found most of the Korea and Japan salmons, haplotype B was from the majority of Canada, Alaska and Russia salmons, haplotypes C and D were specific to America and Korea salmons, respectively. Such association of the haplotypes with geographical distribution was supported by the haplotype network constructed by TCS analysis. Fst and AMOVA analyses of the populations showed close relationship between Korea and Japan populations and that among Canada, Alaska and Russia populations. Nested clade analysis (NCA) using the GeoDis program which analyzes spatial distribution of genetic variance in terms of phylogeography summarized the current population structure and the evolutionary history of the chum salmon populations in the North Pacific as Past fragmentation and/or long distance colonization. This result could be explained by the glaciation event in the North Pacific during the Pleistocene period.