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Abstract:

The hosts of brood parasitic birds are under strong selection pressure to recognize and remove foreign eggs from their nests, but parasite eggs may be too large to be grasped whole and too strong to be readily pierced by the host's bill. Such operating constraints on egg removal are proposed to force some hosts to accept parasite eggs, as the costs of deserting parasitized clutches can outweigh the cost of rearing parasites. By fitting microcameras inside nests, we reveal that the Neotropical baywing (Agelaioides badius), a host of the screaming cowbird (Molothrus rufoaxillaris) and shiny cowbird (Molothrus bonariensis), instead circumvents such constraints by kicking parasite eggs out of the nest. To our knowledge, this is the first report of a passerine bird using its feet to remove objects from the nest. Kick-ejection was an all-or-nothing response. Baywings kick-ejected parasite eggs laid before their own first egg and, if heavily parasitized, they ejected entire clutches and began again in the same nest. Few baywings were able to rid their nests of every parasite egg, but their novel ejection method allowed them to reduce the median parasitism intensity by 75 per cent (from four to one cowbird eggs per nest), providing an effective anti-parasite defence. © 2013 The Author(s) Published by the Royal Society.

Registro:

Documento: Artículo
Título:A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host
Autor:De Marsico, M.C.; Gloag, R.; Ursino, C.A.; Reboreda, J.C.
Filiación:Departamento de Ecologia, Genetica y Evolucion and IEGEBA-CONICET, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom
Palabras clave:Brood parasitism; Cowbird; Egg rejection; Host defence; antiparasite defense; brood parasitism; clutch size; egg rejection; host preference; passerine; animal; animal behavior; article; bird; egg; host parasite interaction; physiology; Animals; Behavior, Animal; Birds; Eggs; Host-Parasite Interactions
Año:2013
Volumen:9
Número:3
DOI: http://dx.doi.org/10.1098/rsbl.2013.0076
Título revista:Biology Letters
Título revista abreviado:Biol. Lett.
ISSN:17449561
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17449561_v9_n3_p_DeMarsico

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Citas:

---------- APA ----------
De Marsico, M.C., Gloag, R., Ursino, C.A. & Reboreda, J.C. (2013) . A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host. Biology Letters, 9(3).
http://dx.doi.org/10.1098/rsbl.2013.0076
---------- CHICAGO ----------
De Marsico, M.C., Gloag, R., Ursino, C.A., Reboreda, J.C. "A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host" . Biology Letters 9, no. 3 (2013).
http://dx.doi.org/10.1098/rsbl.2013.0076
---------- MLA ----------
De Marsico, M.C., Gloag, R., Ursino, C.A., Reboreda, J.C. "A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host" . Biology Letters, vol. 9, no. 3, 2013.
http://dx.doi.org/10.1098/rsbl.2013.0076
---------- VANCOUVER ----------
De Marsico, M.C., Gloag, R., Ursino, C.A., Reboreda, J.C. A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host. Biol. Lett. 2013;9(3).
http://dx.doi.org/10.1098/rsbl.2013.0076