Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs

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As part of the coevolutionary process between brood parasites and their hosts, the latter have developed different strategies to discriminate and reject parasitic eggs. This recognition-rejection process is the primary host defense against costly brood parasitism. The Red-crested Cardinal (Paroaria...

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Autores principales:	Segura, Luciano Noel, Mahler, Bettina, Reboreda, Juan Carlos
Publicado:	2016
Materias:	Antiparasitic defenses brood parasitism egg rejection Molothrus bonariensis Paroaria coronata visual cues antiparasite defense color nesting behavior songbird visual cue
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v133_n2_p308_Segura http://hdl.handle.net/20.500.12110/paper_00048038_v133_n2_p308_Segura
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00048038_v133_n2_p308_Segura
record_format	dspace
spelling	paper:paper_00048038_v133_n2_p308_Segura2023-06-08T14:29:42Z Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs Segura, Luciano Noel Mahler, Bettina Reboreda, Juan Carlos Antiparasitic defenses brood parasitism egg rejection Molothrus bonariensis Paroaria coronata visual cues antiparasite defense brood parasitism color egg rejection nesting behavior songbird visual cue Molothrus bonariensis Paroaria coronata As part of the coevolutionary process between brood parasites and their hosts, the latter have developed different strategies to discriminate and reject parasitic eggs. This recognition-rejection process is the primary host defense against costly brood parasitism. The Red-crested Cardinal (Paroaria coronata) is an occasional host of the generalist Shiny Cowbird (Molothrus bonariensis) that successfully rejects all parasitic eggs. We studied the cues used by Red-crested Cardinals to recognize and reject foreign eggs by experimentally adding real parasite and host eggs painted as mimetic or nonmimetic of host eggs and analyzing whether eggshell coloration and/or shape were used as cues for egg rejection. Rejection rates, mostly through egg ejection, were high for all nonmimetic eggs (95% for unpainted cowbird eggs and 100% for painted nonmimetic cowbird and host eggs). On the contrary, they were low for mimetic host eggs (6% for unpainted host eggs and 20% for painted mimetic host eggs), but intermediate for painted mimetic cowbird eggs (55%). We also found that egg width significantly affected the probability of rejection, with wider parasitic eggs (i.e. more different from host eggs) more frequently rejected. We report for the first time that egg width is an important cue for recognition and ejection of cowbird eggs in an open-cup-nesting host. Our results show that coloration is a reliable cue used by Red-crested Cardinals to discriminate and reject parasitic eggs, but when coloration alone does not allow discrimination of foreign eggs, this host uses egg width as an additional cue. © 2016 American Ornithologists' Union. Fil:Segura, L.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mahler, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v133_n2_p308_Segura http://hdl.handle.net/20.500.12110/paper_00048038_v133_n2_p308_Segura
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Antiparasitic defenses brood parasitism egg rejection Molothrus bonariensis Paroaria coronata visual cues antiparasite defense brood parasitism color egg rejection nesting behavior songbird visual cue Molothrus bonariensis Paroaria coronata
spellingShingle	Antiparasitic defenses brood parasitism egg rejection Molothrus bonariensis Paroaria coronata visual cues antiparasite defense brood parasitism color egg rejection nesting behavior songbird visual cue Molothrus bonariensis Paroaria coronata Segura, Luciano Noel Mahler, Bettina Reboreda, Juan Carlos Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
topic_facet	Antiparasitic defenses brood parasitism egg rejection Molothrus bonariensis Paroaria coronata visual cues antiparasite defense brood parasitism color egg rejection nesting behavior songbird visual cue Molothrus bonariensis Paroaria coronata
description	As part of the coevolutionary process between brood parasites and their hosts, the latter have developed different strategies to discriminate and reject parasitic eggs. This recognition-rejection process is the primary host defense against costly brood parasitism. The Red-crested Cardinal (Paroaria coronata) is an occasional host of the generalist Shiny Cowbird (Molothrus bonariensis) that successfully rejects all parasitic eggs. We studied the cues used by Red-crested Cardinals to recognize and reject foreign eggs by experimentally adding real parasite and host eggs painted as mimetic or nonmimetic of host eggs and analyzing whether eggshell coloration and/or shape were used as cues for egg rejection. Rejection rates, mostly through egg ejection, were high for all nonmimetic eggs (95% for unpainted cowbird eggs and 100% for painted nonmimetic cowbird and host eggs). On the contrary, they were low for mimetic host eggs (6% for unpainted host eggs and 20% for painted mimetic host eggs), but intermediate for painted mimetic cowbird eggs (55%). We also found that egg width significantly affected the probability of rejection, with wider parasitic eggs (i.e. more different from host eggs) more frequently rejected. We report for the first time that egg width is an important cue for recognition and ejection of cowbird eggs in an open-cup-nesting host. Our results show that coloration is a reliable cue used by Red-crested Cardinals to discriminate and reject parasitic eggs, but when coloration alone does not allow discrimination of foreign eggs, this host uses egg width as an additional cue. © 2016 American Ornithologists' Union.
author	Segura, Luciano Noel Mahler, Bettina Reboreda, Juan Carlos
author_facet	Segura, Luciano Noel Mahler, Bettina Reboreda, Juan Carlos
author_sort	Segura, Luciano Noel
title	Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
title_short	Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
title_full	Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
title_fullStr	Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
title_full_unstemmed	Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
title_sort	red-crested cardinals use color and width as cues to reject shiny cowbird eggs
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v133_n2_p308_Segura http://hdl.handle.net/20.500.12110/paper_00048038_v133_n2_p308_Segura
work_keys_str_mv	AT seguralucianonoel redcrestedcardinalsusecolorandwidthascuestorejectshinycowbirdeggs AT mahlerbettina redcrestedcardinalsusecolorandwidthascuestorejectshinycowbirdeggs AT reboredajuancarlos redcrestedcardinalsusecolorandwidthascuestorejectshinycowbirdeggs
_version_	1768543973288181760

Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs

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