Table 2.

Comparison of the fit of four Brownian motion (BM) models and one Ornstein–Uhlenbeck (OU) model of body size evolution based on diet type in cetaceans. Models are ranked from best to worst, using the small-sample corrected Akaike's information criterion (AICc) and Akaike weights (wtAICc). dAICc scores indicate the difference between the candidate model and the best-fitting model. Also given are the number of parameters for each model (K) and the log likelihood (Lk).

model	K	Lk	AICc	dAICc	wtAICc
BM: same rate/different means	4	−11.121	30.898	0	0.96
BM: different rates/different means	6	−11.025	35.473	4.575	0.01
OU: same rate/multiple optima	5	−12.303	35.606	4.708	0.01
BM: same rate/same mean	2	−16.522	37.235	6.337	0.02
BM: different rates/same mean	4	−16.189	41.034	10.135	0.01