Life Sciences Commons^™

Testing Hypotheses About Evolutionary Change On Single Branches Of A Phylogeny Using Evolutionary Contrasts, Mark A. Mcpeek

Dartmouth Scholarship

Interspecific comparisons of phenotypes are used extensively to test hypotheses about the evolutionary forces shaping phenotypic variation, but comparative data analysis is complicated by correlations due to the common ancestry of species. The method of evolutionary contrasts removes such correlations by estimating the amount of character change between pairs of closely related species that has occurred since their most recent common ancestors. The original method allows character change to be estimated only along pairs of branches on a phylogeny, but many hypotheses address change along single branches. In this article the method of evolutionary contrasts is extended to allow character …