Figure 2From: To what extent does Tobler's 1st law of geography apply to macroecology? A case study using American palms (Arecaceae)Distribution of palm species richness. Similarity as a function of geographic distance between 1° × 1° grid cells. Fits are quadratic Gaussian loess fits with automatic span selection (S-PLUS 7.0). Only every 2000th data point is shown.Back to article page