Fig. 1

Sampling locations of the green crab Carcinus aestuarii across the Mediterranean Sea. Distribution patterns and proportions of Cox1 types (I, II, and III) along the examined locations are shown in couloured circles. S-T S: Siculo-Tunisian Strait; PHB: Peloponnese Hydrographic Break (represented by the quasi-circular anti-cyclonic feature southwest of Peloponnese). The base map was constructed with the software DIVA-GIS 7.5.0 (http://www.diva-gis.org)