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Intraspecific eye color variability in birds and mammals: a recent evolutionary event exclusive to humans and domestic animals

dc.creatorjuan Negro
dc.creatorMaría del Cármen Blázquez Moreno
dc.creatorIsmael Galván
dc.date2017
dc.identifierhttp://cibnor.repositorioinstitucional.mx/jspui/handle/1001/1474
dc.identifier.urihttp://dspace.cibnor.mx:8080/handle/123456789/2823
dc.description"Background: Human populations and breeds of domestic animals are composed of individuals with a multiplicity of eye (= iris) colorations. Some wild birds and mammals may have intraspecific eye color variability, but this variation seems to be due to the developmental stage of the individual, its breeding status, and/or sexual dimorphism. In other words, eye colour tends to be a species-specific trait in wild animals, and the exceptions are species in which individuals of the same age group or gender all develop the same eye colour. Domestic animals, by definition, include bird and mammal species artificially selected by humans in the last few thousand years. Humans themselves may have acquired a diverse palette of eye colors, likewise in recent evolutionary time, in the Mesolithic or in the Upper Paleolithic. Presentation of the hypothesis: We posit two previously unrecognized hypotheses regarding eye color variation: 1) eye coloration in wild animals of every species tends to be a fixed trait. 2) Humans and domestic animal populations, on the contrary, have eyes of multiple colors. Sexual selection has been invoked for eye color variation in humans, but this selection mode does not easily apply in domestic animals, where matings are controlled by the human breeder. Testing the hypothesis: Eye coloration is polygenic in humans. We wish to investigate the genetics of eye color in other animals, as well as the ecological correlates. Implications of the hypothesis: Investigating the origin and function of eye colors will shed light on the reason why some species may have either light-colored irises (e.g., white, yellow or light blue) or dark ones (dark red, brown or black). The causes behind the vast array of eye colors across taxa have never been thoroughly investigated, but it may well be that all Darwinian selection processes are at work: sexual selection in humans, artificial selection for domestic animals, and natural selection (mainly) for wild animals."
dc.formatapplication/pdf
dc.languageeng
dc.publisherBioMed Central
dc.relationinfo:eu-repo/semantics/reference/DOI/DOI: 10.1186/s12983-017-0243-8
dc.relationinfo:eu-repo/semantics/reference/URL/URL: https://frontiersinzoology.biomedcentral.com/articles/10.1186/s12983-017-0243-8
dc.relationinfo:eu-repo/semantics/reference/ISSN/ISSN: 1742-9994
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.sourceFrontiers in Zoology
dc.subjectinfo:eu-repo/classification/AUTOR/Eye coloration, Iris, Domestication, Sexual dichromatism, OCA2 gene
dc.subjectinfo:eu-repo/classification/cti/2
dc.subjectinfo:eu-repo/classification/cti/24
dc.subjectinfo:eu-repo/classification/cti/2409
dc.subjectinfo:eu-repo/classification/cti/240903
dc.subjectinfo:eu-repo/classification/cti/240903
dc.titleIntraspecific eye color variability in birds and mammals: a recent evolutionary event exclusive to humans and domestic animals
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion


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