Ecology 6th Edition by Manuel Molles

Exercise 18

In figure 22.7, the number of mammal species on the isolated mountain ranges varies greatly for a given distance from large montane areas, for instance, at a distance of 150 km. What is the likely source of much of this variation
Figure 22.7 Distance from large montane areas and number of montane mammal species on isolated mountain ranges of the American Southwest (data from Lomolino, Brown, and Davis 1989).