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Patterns across species of intraspecific phenotypic variation with environment can shed light on the underlying drivers of adaptive evolution. Phenotypic variation within a species along tropical elevational gradients is of particular interest because species with narrow elevational ranges may still experience considerably varied environmental conditions. Here, we examine morphological variation in...
Is there evidence for convergence in the molecular mechanisms underlying the loss of flight in the avian evolutionary tree? Campagna et al. used genomic data to investigate the genetic basis of flightlessness in steamer ducks, a recently diverged clade that is polymorphic with respect to flight. They found an association between morphological changes related to flightlessness and several genes, one...
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