Figure 22.14 Effects of area and isolation on mountaintop mammals. For mammals that live on mountaintop habitats in the southwestern United States, researchers found (a) more mammal species living on mountaintops of greater area and (b) fewer mammal species living on mountaintops that are more distant from a source of colonists.
Data from M. V. Lomolino et al., Island biogeography of montane forest mammals in the American Southwest, Ecology 70 (1989): 180–194.