Fig. 2.

a A null model developed by 5000 Monte Carlo simulations (without replacement) of empirical range size (dark solid line) [37]. Plotted line with dark markers depicts the empirical species richness. b Second order polynomial regression between simulated range size (y = 0.00x² + 2.10x − 296.80, R² = 0.64, P < 0.001) and empirical range size (y = 0.00x² + 2.30x − 195.48, R² = 0.56, P < 0.001). Simulated range sizes are plotted on the secondary axis