Table 7. Summary of EasyCodeML analysis of positive selection on mitogenomes based on the maximum-likelihood tree.

Foreground branch	Models	ℓn L	Estimates of parameters	Model compared	LRT P-value	Positive sites
Branch model
A. americanus	M0	−64946.8069	ω = 0.03373	M0 vs. two-ratios model	0.000000013
	two-ratios model	−64930.6151	ω0 = 0.03518, ω1 = 0.01848
Bufotes pewzowi	M0	−64946.8069	ω = 0.03373	M0 vs. two-ratios model	0.531545543
	two-ratios model	−64946.6112	ω0 = 0.03390, ω1 = 0.03171
Site model
	M0	−64946.8069	ω0 = 0.03373	M0 vs. M3	0.000000000	[] Not Allowed
	M3	−63668.4498	ω0 = 0.00589, ω1 = 0.1674, ω2 = 112.9303
			p0=0.8121, p1=0.1879, p2=0.00000
	M1a	−64433.7560	ω0 = 0.02376, ω1 = 1.00000	M1a vs. M2a	0.999941002	[] Not Allowed
			p0=0.9531, p1=0.04689
	M2a	−64433.7561	ω0 = 0.02376, ω1 = 1.0000, ω2 = 52.2715
			p0=0.9531, p1=0.04689, p2=0.0000
	M7	−63763.2701	p = 0.1689, q = 2.4119	M7 vs.M8	0.000000000	3584 I 0.654, 3585 T 0.655, 3590 G 0.925, 3594 D 0.942 Not Allowed
	M8	−63730.7785	ω0 = 1.00000, q = 2.5907
			p0=0.9894, p1=0.01056, p2=0.1586
	M8a	−63633.2296	ω0 = 1.00000, q = 3.8578	M8a vs.M8	0.000000000	Not Allowed
			p0=0.9986, p1=0.00145, p2=0.1656