Fig. 1.

Relative importance, in rank order, of intrinsic and extrinsic predictors of marine mammal extinction risk. Numerical values of importance for each predictor variable were calculated as the decrease in classification accuracy after predictor removal in a random forest of 500 trees. Model accuracy was 92% (Cohen's kappa = 0.8, P < 0.0001; Table S2 and Fig. S2). “+” or “−” indicates the direction of correlation for the continuous variables. Drawings are by Sharyn N. Davidson.