The erratic mitochondrial clock: variations of mutation rate, not population size, affect mtDNA diversity across birds and mammals

Table 1 Effects of life-history variables on mtDNA substitution rate in bird species without (A) and with phylogenetic control (B).

Model	slope	R²	p1	p2
(A) Without Phylogenetic control
Body mass	-0.25	0.39	<0.01
Maximum longevity	-0.66	0.25	<0.01
Body mass + Maximum longevity		0.39	<0.01	0.42
(B) With Phylogenetic control
Body mass	-0.22	0.38	<0.01
Maximum longevity	-0.46	0.19	<0.01
Body mass + Maximum longevity		0.38	<0.01	0.89

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