Abstract
ABSTRACT Trait polymorphisms are a perennially popular topic of study in ecology and evolutionary biology. Plumage polymorphisms occur broadly in birds, with a particularly high rate among the raptors. The regularity of this heritable, melanin-based trait in raptors has prompted research into its potential connections to aspects of life history such as immune response, foraging ecology, and mating systems. Because raptors are a non-monophyletic grouping of multiple orders, they can further be leveraged to explore the eco-evolutionary drivers of recurrent plumage polymorphism phenotypes. Here we characterize plumage polymorphism throughout the raptors and review the existing literature on factors involved in its development and maintenance. We identify patterns and trends in this past body of research and discuss the opportunity to strengthen our understanding of plumage polymorphism through a holistic research approach. Specifically, we detail the likely benefits of applying genomic tools to plumage polymorphism research in raptors while encouraging both a focus on unstudied polymorphic species and on the potential interactions among multiple hypotheses that might promote plumage polymorphism.
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