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Fucus radicans
''Fucus radicans'' is a species of brown algae in the family Fucaceae, endemic to and recently evolved within the Baltic Sea. The species was first described by Lena Bergström and Lena Kautsky in 2005 from a location in Ångermanland, Sweden. The specific epithet is from the Latin and means "rooting", referring to the fact that this species primarily reproduces by the taking root of detached fragments.〔(''Fucus radicans'' L.Bergström & L.Kautsky ) AlgaeBase. Retrieved 2012-02-29.〕
''Fucus radicans'' seems to have diverged from the closely related and widely distributed ''Fucus vesiculosus'' within about the last 400 years. It often reproduces clonally, which may have helped its rapid emergence as a new species. Genetic analysis supports the hypothesis of the recent divergence of ''Fucus radicans'' from ''Fucus vesiculosus'' as an example of sympatric speciation, with the two species presently occupying the same semi-marine territory.
==Description==
''Fucus radicans'' is morphologically similar to bladderwrack (''Fucus vesiculosus'') which is dichotomously branched, and has brown leathery fronds known as thalli with a prominent midrib and globular air bladders. The main differences between the two are that plants of ''F. radicans'' are smaller and more bushy than ''F. vesiculosus'' and have narrower thalli. Bladderwrack is common on the foreshore on both sides of the temperate North Atlantic and the subarctic. ''F. radicans'' is endemic to the Baltic Sea, where it grows alongside ''F. vesiculosus''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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