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Dosima
''Dosima fascicularis'', the buoy barnacle, is "the most specialised pleustonic goose barnacle" species. It hangs downwards from the water surface, held up by a float of its own construction, and is carried along by ocean currents.
==Flotation==
As an adult, ''D. fascicularis'' lives attached to a float made either of natural flotsam or of a cement it secretes itself, which has a texture like that of expanded polystyrene foam. It is the only barnacle to produce its own gas-filled float. The cyprid larvae are planktonic, and must attach to a float for metamorphosis into the adult form, but the adults are eventually capable of using their own float, sometimes forming aggregations of many individuals attached to a single float. Among the floats used by adult buoy barnacles are pellets of tar, seaweeds,〔 plastic debris,〔 driftwood,〔 feathers,〔〔 cranberries,〔 cuttlefish bone,〔 the "by-the-wind-sailor" ''Velella velella'', seagrass leaves,〔 Styrofoam,〔 seeds,〔 and even apples;〔 they have even been known to colonise the backs of turtles and the sea snake ''Pelamis platurus''. It is a fugitive species, which can be out-competed by other barnacle species, and relies on being able to colonise surfaces and reproduce quickly; after settling on a float, ''D. fascicularis'' can reproduce within 45 days.〔 Cited in Alvarez & Celis (2004).〕 ''D. fascicularis'' appears to be increasing in abundance as a result of anthropogenic marine debris accumulating in the sea;〔 this source of floats was of "minor importance" in 1974.〔
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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