Figure 3. Species richness and fitted models at different scales in the SFI.

Species richness (dots) as a function of annual precipitation (left) and mean annual temperature (right), computed from the SFI data at different spatial scales, i.e. (from top to bottom) site scale (a,b), or equal sized grains of 5 × 5 km (c,d), 10 × 10 km (e,f), 25 × 25 km (g,h), and 50 × 50 km (i,j). Continuous lines are the selected models (a,f,h,j: linear models; b,c,e,g,i: cubic models; d: no model had R² larger than 0.01). See Supplementary Table S2 for details on model selection.