The sections of Turkey in different systems. (i) Biogeographical system: Euro-Siberian – hatching, Mediterranean – no hatching and Irano-Turanian – dots; (ii) geographical system: ■ Marmara region, ■ Black Sea region, ■ Mediterranean region, ■ Central Anatolia region, ■ South East Anatolia region, ■ East Anatolia region, ■ Aegean region and (iii) the grid system according to Davis (1965–1985, 1988) is overlaid over the map.