We study the evolution of diversity in nature. Our research at Florida International University integrates evolutionary biology, physiology, transcriptomics, and genomics to understand both the evolution and function of phenotypic and genetic variation at different levels of biological organization – between sexes, within species, and among species. We study this diversity in ecosystems from the subtropics of south Florida to lowland tropical rainforest in central Panama and the arid highlands of Mexico and the American southwest.