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. 2001 Apr 10;98(8):4534–4539. doi: 10.1073/pnas.071034898

Figure 2.

Figure 2

Species richness of 2,869 breeding land and fresh-water birds in South America (a), topographic relief (b), and spatial distribution of standardized residuals (c–f) from stepwise multiple regression models presented in Table 2. spp, species.