Figure 22.23 Habitat heterogeneity. Although marshes are more productive than deserts, the relative uniformity of the marsh environment has produced a low diversity of species whereas the heterogeneous landscape of deserts has produced a higher diversity of species. Pictured here are (a) the White River Marsh Wildlife Area in Wisconsin and (b) the Sabino Canyon Recreation Area in Arizona.

Photos by (a) Lee Wilcox and (b) Ron Niebrugge/Alamy.