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Título

The evolution of olfactory capabilities in wild birds: a comparative study

AutorAvilés, Jesús M. CSIC ORCID; Amo, Luisa CSIC ORCID
Palabras claveComparative analysis
Sensory modalities
Social behavior
Foraging efficiency
Avian olfaction
Fecha de publicación2018
EditorSpringer Nature
CitaciónEvolutionary Biology 45: 27-36 (2018)
ResumenModern birds possess an olfactory apparatus similar to that of other vertebrates, yet the major evolutionary forces that drove the evolution of diversity in olfactory capabilities in birds remain elusive. Several non-mutually exclusive evolutionary scenarios for the evolution of olfactory capability in birds have been proposed. Olfactory capability may have evolved due to its role in recognition in social contexts. In addition, olfactory capability may have evolved because it provides a selective advantage in foraging or navigation. Finally, olfactory capability could be favored whenever the ecological conditions of species hindered the use of other senses and/or favored olfaction. Here we evaluate predictions from these hypotheses in a comparative study using a species-level phylogeny of 142 bird species and considering the indirect effects of some predictors on others. We find an interactive effect of aquatic dependence and diet on the size of the olfactory bulb: vegetarian and omnivore birds living in aquatic environments have larger olfactory bulbs than terrestrial birds, whereas species with an animal diet, aquatic and terrestrial species have similar-sized olfactory bulbs. In addition, the size of the olfactory bulb was weakly related with social complexity, with colonial species having relatively larger olfactory bulb than solitary breeders or those forming small aggregations. Our results suggest that the role of foraging in driving enhancements in the avian olfactory apparatus is contingent on ecological conditions that may affect the transmission of odor-based signals. This provides evidence for the largely neglected possibility that the evolution of the olfactory apparatus of birds has been driven by the interaction between ecological and behavioral traits, rather than being solely due to main effects of these traits.
Versión del editorhttps://doi.org/10.1007/s11692-017-9427-6
URIhttp://hdl.handle.net/10261/197560
DOI10.1007/s11692-017-9427-6
ISSN0071-3260
E-ISSN1934-2845
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