Regression models of several visual traits with different predictor variables when controlling for phylogeny (PGLS).

<p>The results are identical and independent of the phylogeny used. Standard length was added as a covariate in the models. λ = phylogenetic scaling parameter, the superscript * after the parameter λ indicates whether the parameter was significantly different from 0 (first position) and from 1 (second position) in the likelihood tests, β = partial regression slope. In bold are the significant results. The sampling size was 50.