s) in freshwater (A) and marine (B) fishes.](pone.0000000.g000){#pone-0000000-g000}  ![Frequency distribution plots of geographic range sizes expressed as extent of occurrence (EOO, number of grid cells of 0° along the maximum latitudinal range × number of grid cells of 0° along the maximum longitudinal range of each species) in freshwater (A) and marine (B) fishes.](pone.0000000.g000){#pone-0000000-g000}  Materials and Methods {#s0} =====================  Mo