Table 6. Summary of EasyCodeML analysis of positive selection on mitogenomes based on the phylogenetic tree from BI.

Foreground branch	Models	ℓn L	Estimates of parameters	Model compared	LRT P-value	Positive sites
Branch model
A. americanus	M0	−64953.9215	ω = 0.03375	M0 vs. two-ratios model	0.000000011
	two-ratios model	−64937.6024	ω0 = 0.03520, ω1 = 0.01846
Bufotes pewzowi	M0	−64953.9215	ω = 0.03375	M0 vs. two-ratios model	0.588391030
	two-ratios model	−64953.7750	ω0 = 0.03390, ω1 = 0.03200
Site model
	M0	−64953.9215	ω0 = 0.03375	M0 vs. M3	0.000000000	[] Not Allowed
	M3	−63675.0885	ω0 = 0.00589, ω1 = 0.1673, ω2 = 101.4548
			p0=0.8120, p1=0.1880, p2=0.00000
	M1a	−64441.3475	ω0 = 0.02382, ω1 = 1.00000	M1a vs. M2a	0.999999000	[] Not Allowed
			p0=0.9533, p1=0.04670
	M2a	−64441.3475	ω0 = 0.02382, ω1 = 1.0000, ω2 = 40.4741
			p0=0.9533, p1=0.04670, p2=0.0000
	M7	−63769.6465	p = 0.1688, q = 2.4104	M7 vs.M8	0.000000000	3584 I 0.655, 3585 T 0.654, 3590 G 0.925, 3594 D 0.942 Not Allowed
	M8	−63735.9750	ω0 = 1.00000, q = 2.5906
			p0=0.9893, p1=0.01066, p2=0.1583
	M8a	−63639.2914	ω0 = 1.00000, q = 3.8610	M8a vs.M8	0.000000000	Not Allowed
			p0=0.9985, p1=0.00149, p2=0.1657