Degree of intraspecific genetic divergence and variability in three sciaenid species.
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概要
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Genetic variations in <I>Nibea mitsukurii, N. albiflora</I> and <I>Pennahia argentata</I> from different localities were assayed electrophoretically. The genetic variability in <I>N. mitsukurii</I> was relatively high. According to the chi-square values for heterogeneity between two localities and genetic distance (<I>D</I>) values, <I>N. albiflora</I> from the Ariake Sea and the Inland Sea or the East China Sea (<I>D</I>=0.0092 in average), and <I>N. misukurii</I>, from Tosa Bay vs. Atsumi Bay (<I>D</I>=0.0067) were considered to be independent subpopulations. The <I>D</I> value in <I>N. albiflora</I> from the Inland Sea vs. the East China Sea was quite small (<I>D</I>=0.0010). In <I>P. argentata</I> populations, the <I>D</I> values were also small. Further, the relationship between genetic and geographic distances observed in the three species were discussed. <I>P. argentata</I> showed a positive relationship between these two factors as compared to <I>N. mitsukurii</I> or <I>N. albiflora</I>. It seemed that the lower level of genetic divergence might be due to the frequent gene flow within the large-scale and wide distributional range of the population.
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