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Abstract:

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.

Registro:

Documento: Artículo
Título:Brood parasite eggs enhance egg survivorship in a multiply parasitized host
Autor:Gloag, R.; Fiorini, V.D.; Reboreda, J.C.; Kacelnik, A.
Filiación:Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
Palabras clave: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
Año:2012
Volumen:279
Número:1734
Página de inicio:1831
Página de fin:1839
DOI: http://dx.doi.org/10.1098/rspb.2011.2047
Título revista:Proceedings of the Royal Society B: Biological Sciences
Título revista abreviado:Proc. R. Soc. B Biol. Sci.
ISSN:09628452
CODEN:PRLBA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_09628452_v279_n1734_p1831_Gloag.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09628452_v279_n1734_p1831_Gloag

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Citas:

---------- APA ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C. & Kacelnik, A. (2012) . Brood parasite eggs enhance egg survivorship in a multiply parasitized host. Proceedings of the Royal Society B: Biological Sciences, 279(1734), 1831-1839.
http://dx.doi.org/10.1098/rspb.2011.2047
---------- CHICAGO ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. "Brood parasite eggs enhance egg survivorship in a multiply parasitized host" . Proceedings of the Royal Society B: Biological Sciences 279, no. 1734 (2012) : 1831-1839.
http://dx.doi.org/10.1098/rspb.2011.2047
---------- MLA ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. "Brood parasite eggs enhance egg survivorship in a multiply parasitized host" . Proceedings of the Royal Society B: Biological Sciences, vol. 279, no. 1734, 2012, pp. 1831-1839.
http://dx.doi.org/10.1098/rspb.2011.2047
---------- VANCOUVER ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. Brood parasite eggs enhance egg survivorship in a multiply parasitized host. Proc. R. Soc. B Biol. Sci. 2012;279(1734):1831-1839.
http://dx.doi.org/10.1098/rspb.2011.2047