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On the occurrence of alien macroalgae in the vermetid reef along the coasts ofFavignana Island (S-Tyrrhenian Sea)       107






























































                                                           Figure 1. Location of the study areas at Favignana Island.

























































                        Figures 2-5. Cciulerpa cylindracea. Fig. 2: Habit (photo by Fabio Russo). Figs. 3, 4: Patches within cuvettes, the stolons of
                         Caulerpa cylindracea are strictly intermingled with the thalli of other macroalgae (San Giuseppe). Fig. 5: A patch beneath
                        the reef (San Giuseppe).
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