A study of species biology on a brown alga Scytosiphon lomentaria in Japan

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Species is a fundamental unit for understanding of biodiversity. But, we sometimes encounter species whose species boundary is unclear. Scytosiphon lomentaria is a brown alga that is distributed in cold and warm waters worldwide and is recognized as a single species. In this study, molecular analyses of DNA sequences of some genes and cross experiments were carried out in S. lomentaria from Japan. The results suggested that Japanese S. lomentaria includes three species at least and that two species of them are very closely related and are able to cross between them in laboratory.