Figure 2. Final predictor influences in boosted regression tree models estimating winter species distributions of bat speciesCorynorhinus townsendii , Myotis californicus , Myotis lucifugus , Myotis velifer , and Perimyotis subflavusacross the United States and Canada. Brighter colors indicate higher influence; predictors that were dropped from a given model are shown in gray. Variables are ordered by their average influence across species (decreasing left to right).