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Fig. 2. In the group of genera with accelerated evolution of cytochrome b exceptional longevity and the lifetime expenditure of energy are strong functions of the rate of evolution of cytochrome b. Data are from Table S2 in supplementary material. The genera with high Scytb values (the upper quadrant, Scytb>0.1345) are indicated by open symbols; the genera with the low Scytb values (the lowest quadrant, Scytb<0.069) are indicated by solid symbols. When the linear regression was not significant the regression line was omitted. (A) Exceptional longevity as a function of Scytb. The ratio of observed longevity (L_o) to predicted longevity (L_p), L_o/L_p, is derived from the residuals of the linear regressions (solid curves) of the Neognathae clade shown in Fig. 1C,D. The squares indicate the residuals from L(BMR_w) (Fig. 1D) and the circles indicate the residuals from L(M) (Fig. 1C). For the high Scytb group, L_o/L_p(M)=–7.068+57.5xScytb (N=15, r²=0.605, P<0.001) and L_o/L_p(BMR_w)=–7.258+58.7xScytb (N=15, r²=0.618, P<0.001). For the low Scytb group, L_o/L_p(M)=0.869+6.8xScytb (N=15, r²=0.013, P=0.689), and L_o/L_p(BMR_w)=0.347+16.6xScytb (N=15, r²=0.06, P=0.371). For the whole clade, L_o/L_p(M)=1.02+0.55xScytb (N=59, r²=0.0021, P=0.731) and L_o/L_p(BMRw)=1.13–0.419xScytb (N=59, r²=0.001, P=0.804). (B) Lifetime energy expenditure as a function of body mass. The linear regression for the high Scytb group is LxBMR_w=153+15xlnM (N=15, r²=0.004, P=0.854). The linear regression for the low Scytb group is LxBMR_w=250–19xlnM (N=15, r²=0.436, P=0.007). For the whole clade, LxBMR_w=218–17.2xlnM (N=59, r²=0.217, P<0.001). The correct value of lifetime expenditure of energy can be obtained by multiplying LxBMR_w by 31 536 000 (the number of seconds in one year). (C) Lifetime expenditure of energy as a function of Scytb. For the high Scytb group, LxBMR_w=–488+9612xScytb (N=15, r²=0.579, P<0.001). For the low Scytb group, LxBMR_w=155–514xScytb (N=15, r²=0.0026, P=0.857). For the whole clade, LxBMR_w=39.3+982xScytb (N=59, r²=0.206, P<0.001).

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