Figure S1 Relationships between the accuracy of generalized additive models (GAM) and boosted regression tree (BRT) models validated with independent and non-independent observations, evaluated with area under the curve of a receiver operating characteristic plot (AUC) and true skill statistic (TSS). Figures in the left column are based on climate-only models, while figures in the right column are based on combined climate-soil-land-cover models. Rho (ρ) values for Spearman's rank correlations (P < 0.001 for all), as well as linear regression fits are shown. Dotted lines indicate the 1:1 relationship. A drop in ρ values between climate-only models (left) and combined climate-soil-land-cover models (right) indicates that some species distributions are better predicted when using independent validation in combination with more complex models.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.