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

Table 2 PGLS regression coefficients from models testing whether wing loading and environmental variables explain molecular rates. A Box-Cox transformation was used for all molecular rates variables

Molecular rate response regression terms	Wing loading	Log body mass	Median annual temperature	Median UV radiation	Wing loading * log body mass	Median annual temperature * median UV radiation	R ²
Mitochondrial d_N/d_S	0.318	0.274	0.042	1.00E−04	− 0.118	− 7.69E−06	0.015
Mitochondrial d_N	0.149	0.093	0.084*	1.94E−04*	− 0.016	− 1.56E−05*	0.033
Mitochondrial d_S	− 0.242	− 0.251	0.055	1.32E−04	0.145	− 1.07E−05	0.043
Nuclear d_N/d_S	− 1.060	− 0.179	−0.030	− 1.72E−04	0.225	4.70E−06	0.050
Nuclear d_N	0.174	0.232	0.042	4.00E−05	− 0.115	− 7.35E−06	0.013
Nuclear d_S	1.655	0.514	0.083	2.79E−04	− 0.464	− 1.58E−05	0.094

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