Environmental niche and flight intensity are associated with molecular evolutionary rates in a large avian radiation

Table 1 PGLS regression coefficients from models testing whether the hand-wing index and environmental variables explain molecular rates. A Box-Cox transformation was used for all molecular rates variables

Molecular rate response regression terms	Hand-wing index	Log body mass	Median annual temperature	Median UV radiation	Hand-wing index * log body mass	Median annual temperature * median UV radiation	R ²
Mitochondrial d_N/d_S	0.091*	0.442*	0.040	1.07E−04	− 0.026*	− 7.40E−06	0.023
Mitochondrial d_N	0.115*	0.669**	0.079*	1.90E−04**	− 0.035*	− 1.51E−05**	0.047
Mitochondrial d_S	0.091	0.617*	0.062	1.33E−04	− 0.025	− 1.12E−05	0.031
Nuclear d_N/d_S	0.081	0.471	− 0.037	− 1.57E−04	− 0.020	5.79E−06	0.045
Nuclear d_N	0.033	− 0.024	0.070	1.39E−04	− 0.003	− 1.25E−05	0.020
Nuclear d_S	−0.049	− 0.690	0.140	4.21E−04	0.020	− 2.58E−05	0.087

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