Variable importance from 22 Random Forest species distribution models for the particularly dry period, 1987–1992.

Top ten variables shown in descending order of rank. Variable categories were denoted by W (wetland), U (upland), P (precipitation), and T (temperature). Signs indicated the relationship between the predictor and the species response: + (positive), - (negative), m (unimodel), and ∼ (equivocal).