Elucidation of the factors which influence genetic differentiation and gene flow in populations of harmful algal bloom causing species

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In this study, we examined the factors influencing to population genetic structures of three harmful algal bloom causing microalgal species in Japanese coastal waters. The population genetics analysis by use of highly polymorphic microsatellite markers strongly suggested that population expansion and new introduction in Alexandrium tamarense and Heterocapsa circularisquama has occurred by gene flow through human-assisted dispersal, namely transfers of vegetative cells via translocation of the Japanese oyster and Japanese pearl oyster's spats. In Alexandrium catenella, we obtained negative data in the population genetic study to proof the human-associated introduction from Japan to Thau lagoon (French coasts in Mediterranean Sea).