Brood parasite eggs enhance egg survivorship in a multiply parasitized host

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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: Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A.
Formato: JOUR
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: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 todo:paper_09628452_v279_n1734_p1831_Gloag
record_format dspace
spelling todo:paper_09628452_v279_n1734_p1831_Gloag2023-10-03T15:54:18Z Brood parasite eggs enhance egg survivorship in a multiply parasitized host Gloag, R. Fiorini, V.D. Reboreda, J.C. Kacelnik, A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Gloag, R.
Fiorini, V.D.
Reboreda, J.C.
Kacelnik, A.
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.
format JOUR
author Gloag, R.
Fiorini, V.D.
Reboreda, J.C.
Kacelnik, A.
author_facet Gloag, R.
Fiorini, V.D.
Reboreda, J.C.
Kacelnik, A.
author_sort Gloag, R.
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
url http://hdl.handle.net/20.500.12110/paper_09628452_v279_n1734_p1831_Gloag
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AT fiorinivd broodparasiteeggsenhanceeggsurvivorshipinamultiplyparasitizedhost
AT reboredajc broodparasiteeggsenhanceeggsurvivorshipinamultiplyparasitizedhost
AT kacelnika broodparasiteeggsenhanceeggsurvivorshipinamultiplyparasitizedhost
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