日本沿岸および東シナ海域のマダイの遺伝変異および集団構造について〔英文〕

概要

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Genotypic and allelic frequencies were examined at 24 enzymatic loci in 11 samples of red sea bream from the coastal waters of Japan and the East China Sea. Nine loci (37.5%) were poly-morphic (major allele frequency less than 0.95), i.e., Aat-2, Adh, α-Gpd-1, Est, Idh-1, Me-1, 6-Pgd, and Sdh. The average heterozygosity and number of alleles per locus were 0.113 and 1.981, respectively. Comparison of allele frequencies coupled with estimates of the genetic distance (D) and the stand-ardized genetic variance (FST), indicated that the Japanese population was genetically distinct from the East China Sea population. Most of this differentiation was due to high frequency of Estc and Me-1B alleles in the East China Sea population. Comparisons of pooled allele frequencies representing the three major areas in Japan (Japan Sea, Seto Inland Sea and Pacific Ocean) did not reveal any differences. A pairwise com-parison among samples, however, revealed that Kagoshima and Kanagawa samples were signifi-cantly different from other samples. The possible explanations for the observed differences in allele frequencies among Japanese populations are discussed.