Thermal biology of African lovebirds and Australian grass parakeets
We compared aspects of the thermal biology of two groups of small parrots, of similar body mass, each derived from a range of habitat types, varying in aridity, but indigenous to either southern Africa or Australia. By accounting for phylogenetic differences, we were able to question whether arid zone species have lower metabolic rates and […]
Comparative Methods with Sampling Error and Within-Species Variation: Contrasts Revisited and Revised
Comparative methods analyses have usually assumed that the species phenotypes are the true means for those species. In most analyses, the actual values used are means of samples of modest size. The covariances of contrasts then involve both the covariance of evolutionary changes and a fraction of the within‐species phenotypic covariance, the fraction depending on […]