Fig. 6
Suitable climatic niches for North American raven lineages under present-day and Pleistocene LGM (18–21 kya) climatic conditions. ENMs predict overlap in suitable climatic niches in western United States, Mexico and Central America for Holarctic, California and Chihuahuan Raven lineages during the LGM under both MIROC and CCSM paleo-climate models. Colours correspond to the predicted relative climatic suitability for each lineage in North America (see inset for key to probability of occurrence). Regions with probability of occurrence above 0.4 are considered typical of the abiotic niche of the species. Test AUC scores for each model followed by the maximum possible AUC score in brackets and the standard deviations are as follows: California: 0.77 (0.78) ± 0.003; Holarctic: 0.64 (0.64) ± 0.003; admixed west USA: 0.71 (0.72) ± 0.003; Chihuahuan Ravens: 0.88 (0.88) ± 0.003. See Supplementary Fig. 5 for ENMs based on different regional subsets and for collection localities used in ENMs for each lineage
