Fig. 5.

PCA of the proportion of OR gene families (A) and corresponding circle of correlations of OR families to PC 1 and 2 (B). The first two PCs account for 47.8% of the total variance. OR families 51, 6, 52, and 55 load negatively to PC1, whereas families 14 and 2-13 load positively to this PC. Families 1-3-7, 11, and 56 contribute positively to the second component, and families 5-8-9, 10, and 12 load negatively to PC2. Symbol color represents species ecogroups (beige: desertic, brown: fossorial, blue: semiaquatic, green: terrestrial). Symbol shape depicts diet (square: carnivorous, disc: herbivorous, triangle: omnivorous). Full species names are reported in supplementary table S1, Supplementary Material online.