Map of studied area. Stations in Thermaikos Gulf: 1. Palioura; 2. Paralia of Epanomi; 3. Cape of Epanomi; 4. Central Thermaikos Gulf. Stations in Chalkidiki: 5. Afitos; 6. Nea Fokaia; 7. NW Toronaeos Gulf; 8. Spalathonisia; 9. Tristinika; 10. Marathia; 11. Toroni; 12. Porto Koufo; 13. Ampelos; 14. Central Siggitikos Gulf; 15. Pyrgadikia. The protected by NATURA 2000 wetland areas (w) as well as the Holy Mount of monaster life and unique flora in Athos peninsula (HM), are also indicated.