Brood parasite eggs enhance egg survivorship in a multiply parasitized host

Despite the costs to avian parents of rearing brood parasitic offspring, many species do not reject foreign eggs from their nests.We show that where multiple parasitism occurs, rejection itself can be costly, by increasing the risk of host egg loss during subsequent parasite attacks. Chalk-browed mo...

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Autores principales:	Fiorini, Vanina Dafne, Reboreda, Juan Carlos
Publicado:	2012
Materias:	Egg rejection Evolutionary equilibrium Host defence Mimus saturninus Molothrus bonariensis Risk dilution brood parasitism clutch size defense behavior egg rejection Monte Carlo analysis numerical model parent-offspring interaction passerine rearing reproductive cost survivorship Aves Molothrus
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09628452_v279_n1734_p1831_Gloag http://hdl.handle.net/20.500.12110/paper_09628452_v279_n1734_p1831_Gloag
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09628452_v279_n1734_p1831_Gloag
record_format	dspace
spelling	paper:paper_09628452_v279_n1734_p1831_Gloag2023-06-08T15:58:06Z Brood parasite eggs enhance egg survivorship in a multiply parasitized host Fiorini, Vanina Dafne Reboreda, Juan Carlos Egg rejection Evolutionary equilibrium Host defence Mimus saturninus Molothrus bonariensis Risk dilution brood parasitism clutch size defense behavior egg rejection Monte Carlo analysis numerical model parent-offspring interaction passerine rearing reproductive cost survivorship Aves Mimus saturninus Molothrus Molothrus bonariensis Despite the costs to avian parents of rearing brood parasitic offspring, many species do not reject foreign eggs from their nests.We show that where multiple parasitism occurs, rejection itself can be costly, by increasing the risk of host egg loss during subsequent parasite attacks. Chalk-browed mockingbirds (Mimus saturninus) are heavily parasitized by shiny cowbirds (Molothrus bonariensis), which also puncture eggs in host nests. Mockingbirds struggle to prevent cowbirds puncturing and laying, but seldom remove cowbird eggs once laid. We filmed cowbird visits to nests with manipulated clutch compositions and found that mockingbird eggs were more likely to escape puncture the more cowbird eggs accompanied them in the clutch. A Monte Carlo simulation of this 'dilution effect', comparing virtual hosts that systematically either reject or accept parasite eggs, shows that acceptors enjoy higher egg survivorship than rejecters in host populations where multiple parasitism occurs. For mockingbirds or other hosts in which host nestlings fare well in parasitized broods, this benefit might be sufficient to offset the fitness cost of rearing parasite chicks, making egg acceptance evolutionarily stable. Thus, counterintuitively, high intensities of parasitism might decrease or even reverse selection pressure for host defence via egg rejection. © 2012 The Royal Society. Fil:Fiorini, V.D. 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09628452_v279_n1734_p1831_Gloag http://hdl.handle.net/20.500.12110/paper_09628452_v279_n1734_p1831_Gloag
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Egg rejection Evolutionary equilibrium Host defence Mimus saturninus Molothrus bonariensis Risk dilution brood parasitism clutch size defense behavior egg rejection Monte Carlo analysis numerical model parent-offspring interaction passerine rearing reproductive cost survivorship Aves Mimus saturninus Molothrus Molothrus bonariensis
spellingShingle	Egg rejection Evolutionary equilibrium Host defence Mimus saturninus Molothrus bonariensis Risk dilution brood parasitism clutch size defense behavior egg rejection Monte Carlo analysis numerical model parent-offspring interaction passerine rearing reproductive cost survivorship Aves Mimus saturninus Molothrus Molothrus bonariensis Fiorini, Vanina Dafne Reboreda, Juan Carlos Brood parasite eggs enhance egg survivorship in a multiply parasitized host
topic_facet	Egg rejection Evolutionary equilibrium Host defence Mimus saturninus Molothrus bonariensis Risk dilution brood parasitism clutch size defense behavior egg rejection Monte Carlo analysis numerical model parent-offspring interaction passerine rearing reproductive cost survivorship Aves Mimus saturninus Molothrus Molothrus bonariensis
description	Despite the costs to avian parents of rearing brood parasitic offspring, many species do not reject foreign eggs from their nests.We show that where multiple parasitism occurs, rejection itself can be costly, by increasing the risk of host egg loss during subsequent parasite attacks. Chalk-browed mockingbirds (Mimus saturninus) are heavily parasitized by shiny cowbirds (Molothrus bonariensis), which also puncture eggs in host nests. Mockingbirds struggle to prevent cowbirds puncturing and laying, but seldom remove cowbird eggs once laid. We filmed cowbird visits to nests with manipulated clutch compositions and found that mockingbird eggs were more likely to escape puncture the more cowbird eggs accompanied them in the clutch. A Monte Carlo simulation of this 'dilution effect', comparing virtual hosts that systematically either reject or accept parasite eggs, shows that acceptors enjoy higher egg survivorship than rejecters in host populations where multiple parasitism occurs. For mockingbirds or other hosts in which host nestlings fare well in parasitized broods, this benefit might be sufficient to offset the fitness cost of rearing parasite chicks, making egg acceptance evolutionarily stable. Thus, counterintuitively, high intensities of parasitism might decrease or even reverse selection pressure for host defence via egg rejection. © 2012 The Royal Society.
author	Fiorini, Vanina Dafne Reboreda, Juan Carlos
author_facet	Fiorini, Vanina Dafne Reboreda, Juan Carlos
author_sort	Fiorini, Vanina Dafne
title	Brood parasite eggs enhance egg survivorship in a multiply parasitized host
title_short	Brood parasite eggs enhance egg survivorship in a multiply parasitized host
title_full	Brood parasite eggs enhance egg survivorship in a multiply parasitized host
title_fullStr	Brood parasite eggs enhance egg survivorship in a multiply parasitized host
title_full_unstemmed	Brood parasite eggs enhance egg survivorship in a multiply parasitized host
title_sort	brood parasite eggs enhance egg survivorship in a multiply parasitized host
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09628452_v279_n1734_p1831_Gloag http://hdl.handle.net/20.500.12110/paper_09628452_v279_n1734_p1831_Gloag
work_keys_str_mv	AT fiorinivaninadafne broodparasiteeggsenhanceeggsurvivorshipinamultiplyparasitizedhost AT reboredajuancarlos broodparasiteeggsenhanceeggsurvivorshipinamultiplyparasitizedhost
_version_	1768543809695645696

Brood parasite eggs enhance egg survivorship in a multiply parasitized host

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