High evolutionary constraints limited adaptive responses to past climate changes in toad skulls.

ABSTRACT: Interactions among traits that build a complex structure may be represented as genetic covariation and correlation. Genetic correlations may act as constraints, deflecting the evolutionary response from the direction of natural selection. We investigated the relative importance of drift, selection, and constraints in driving skull divergence in a group of related toad species. The distributional range of these species encompasses very distinct habitats with important climatic differences and the species are primarily distinguished by differences in their skulls. Some parts of the toad skull, such as the snout, may have functional relevance in reproductive ecology, detecting water cues. Thus, we hypothesized that the species skull divergence was driven by natural selection associated with c

SUBMITTER: Simon MN 

PROVIDER: S-EPMC5095385 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature