Segnalazione di macroalghe non-indigene nel porto di Ancona (medio Adriatico)

The first record of Antithamnion hubbsii E.Y. Dawson, Grateloupia turuturu Yamada and Sargassum muticum (Yendo) Fensholt in the Ancona Harbour (Middle Adriatic) is reported. These non-indigenous macroalgae have colonized the hard substrata of the harbour, probably introduced by international shipping, in the ballast water or by hull-fouling. At the moment there is not evidence of their occurrence on surrounding natural rocky substrata.