dc.creatorBlanco, Guillermo
dc.creatorBertellotti, Néstor Marcelo
dc.date.accessioned2020-02-13T20:32:59Z
dc.date.accessioned2022-10-15T16:27:54Z
dc.date.available2020-02-13T20:32:59Z
dc.date.available2022-10-15T16:27:54Z
dc.date.created2020-02-13T20:32:59Z
dc.date.issued2002-02
dc.identifierBlanco, Guillermo; Bertellotti, Néstor Marcelo; Differential predation by mammals and birds: Implications for egg-colour polymorphism in a nomadic breeding seabird; Oxford University Press; Biological Journal of The Linnean Society; 75; 2; 2-2002; 137-146
dc.identifier0024-4066
dc.identifierhttp://hdl.handle.net/11336/97484
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4409154
dc.description.abstractSelection for crypsis in varying environments has long been established as the main evolutionary force promoting the huge variation in avian egg coloration. In several avian species, variation in egg coloration exists, but available information available on the relative success of these different colour morphs against predation is scarce. We investigated the value of eggshell coloration against mammal and avian predators in the South American Tern, Sterna hirundinacea. We found evidence of a relationship between particular eggshell ground coloration and success against predation, in different tern colonies, where strong selection was caused by single avian and mammalian predator species. Survival to hatching of eggs with greenish ground coloration was greater than in eggs of the remaining colours when a mammalian carnivore was present. This implies that the human visual system does not accurately represent predator perception but that, viewed through the predator's eyes, the conspicuous greenish eggs are well concealed. The rate of artificial nest predation by visually searching gulls was higher for eggs more conspicuous to the human eye than for eggs more closely resembling the nest substrate. The evolution of polymorphisms in eggshell ground colour may have resulted from differences in the type of predator present, and differences in choice of breeding site varying in the background substrate. The nomadic breeding behaviour of terns may imply that females differing in the frequency of alleles expressing particular egg coloration, selected for in particular environments, may eventually gather in some colonies, thus producing the observed intracolony variation in egg coloration. We hypothesise that egg colour variation could be maintained in the population by shifting peaks of predation impact in the different locations where colonies form, e.g. islands without mammalian predators vs. mainland sites.
dc.languageeng
dc.publisherOxford University Press
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1046/j.1095-8312.2002.00026.x
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/biolinnean/article/75/2/137/2639854
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectEGG-COLOUR POLYMORPHISM
dc.subjectPREDATION
dc.subjectSOUTH AMERICAN TERN
dc.subjectSTERNA HIRUNDINACEA
dc.titleDifferential predation by mammals and birds: Implications for egg-colour polymorphism in a nomadic breeding seabird
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


Este ítem pertenece a la siguiente institución