Figure 2.

Latitudinal distribution of the range endpoints of marine gastropods on the eastern Pacific and western Atlantic shelves, binned per degree of altitude. Each point represents the ratio, expressed as a percentage, of the number of species ranges that end at that latitude to the total number of species present at that latitude. Latitudes with the high concentrations of range endpoints represent provincial boundaries (14). Unlike the diversity trends, species range endpoints are distributed very differently along the two marine shelves.