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Abstract Genetic divergence among ten populations of small- and large-egg forms of the brackish-water polychaete Hediste japonica complex was investigated on 14 isozyme loci by electrophoretic analysis. The two forms were distinguishable by complete allele substitutions at five loci, resulting in high genetic differentiation (Neis D: 0.533 to 0.662). No genetic evidence of hybridization between the...
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