Figure 22.6 Species richness increases with habitat area. In a survey of 30 wetlands in Ontario, Canada, an increase in wetland area was found to be associated with an increase in species richness in (a) plants, (b) amphibians and reptiles, (c) birds, and (d) mammals.

Data from C. S. Findlay and J. Houlahan, Anthropogenic correlates of species richness in southeastern Ontario wetlands, Conservation Biology 11 (1997): 1000–1009.