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Bird species sing different songs and as a result rarely breed with each other. Species are not static but can shift in acoustic… Expand A review of the reproductive biology of fleshy-fruited species of Opuntia sensu stricto was conducted. Among Cactaceae, Opuntia… Expand We use genetic divergence at 16 microsatellite loci to investigate how geographical features of the Galápagos landscape structure… Expand Comprehensive long-term studies of isolated populations provide valuable comparative data that may be used to evaluate different… Expand Summary(1)There is a close association between Opuntia helleri (cactus) and Geospiza conirostris (cactus finch) on Isla Genovesa… Expand Evolution can be predicted in the short term from a knowledge of selection and inheritance. However, in the long term evolution… Expand We studied the influence of extra-pair paternity on heritability estimates of morphological traits in a population of the Medium… Expand Darwinian fitness of an individual is measured by the number of recruits it contributes to the next generation. We studied… Expand The western white butterfly, Pieris occidentalis Reakirt, and the checkered white butterfly, P. protodice Bosiduval & LeConte… Expand Sexual selection on a phenotypic trait arises when that trait covaries with mating success among individuals of the same sex… Expand