Table 1.

Relationships between the proportion of terrestrial species in major vertebrate clades and their net diversification rates (estimated under three relative extinction fractions), and using two alternate ages for cyclostomes and the vertebrate root [12,13]. AIC, Akaike information criterion; div. rate, diversification rate; prop., proportion.

variables	r2	p-value	AIC
Erwin et al. [12] tree
div. rate (e = 0) ∼ prop. terrestrial	0.6594	0.0008	75.4384
div. rate (e = 0.5) ∼ prop. terrestrial	0.6615	0.0008	74.8602
adiv. rate (e = 0.9) ∼ prop. terrestrial	0.6685	0.0011	79.8808
ln-species ∼ div. rate (e = 0)	0.8471	<0.0001	40.5479
ln-species ∼ div. rate (e = 0.5)	0.8617	<0.0001	39.4395
ln-species ∼ div. rate (e = 0.9)	0.8765	<0.0001	38.2015
Blair & Hedges [13] tree
div. rate (e = 0) ∼ prop. terrestrial	0.6503	0.0020	70.3817
div. rate (e = 0.5) ∼ prop. terrestrial	0.6431	0.0022	69.7182
div. rate (e = 0.9) ∼ prop. terrestrial	0.6308	0.0026	67.1607
ln-species ∼ div. rate (e = 0)	0.7996	0.0002	39.3290
ln-species ∼ div. rate (e = 0.5)	0.8164	0.0001	38.4524
ln-species ∼ div. rate (e = 0.9)	0.8356	<0.0001	37.3477

^aOptimization for PGLS analysis failed, and ordinary least-squares regression was used instead.