Comparison of the gene frequency between sympatric populations of ninespine sticklebacks, genus Pungitius, in Hokkaido, Japan.

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Gene frequencies, estimated by electrophoretical analysis, were compared between sympatric populations of ninespine sticklebacks, Pungitius pungitius, P. tymensis and P. sinensis, in Hokkaido, Japan. The loci examined were Ldh-E, Sod, Pgm and Mp. Consequently, significant differences were detected between P. tymensis and other species in all rivers examined. This result strongly suggests that P. tymensis is reproductively isolated from the other species even when they coexist, although a few natural hybrids between P. pungitius and P. tymensis were found through its heterozygosity in esterase isozyme patterns and in Pgm. On the other hand, no significant difference was detected between P. pungitius and P. sinensis populations in the Biwase River of eastern Hokkaido. Therefore, it is suggested that they possibly belong to a single interbreeding population.
日本魚類学会の論文