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Abstract:

Brood-parasitic cowbirds (Molothrus spp.) exploit the parental care of other species (hosts) that raise their offspring. Parasitism by cowbirds reduces host reproductive success in several ways and quantifying such costs is an important step to better understand evolutionary interactions in host-parasite associations. We estimated the costs of parasitism by the host-specialist Screaming Cowbird (M. rufoaxillaris) to the reproductive success of its primary host, the Baywing (Agelaioides badius). We tested the effect of Cowbird parasitism on egg survival, hatching success, nestling survival and body mass at fledging of Baywings in a population of eastern Argentina where the frequency of parasitism by Screaming Cowbirds exceeds 90% of Baywing nests. Egg survival decreased with the number of Screaming Cowbird eggs laid during the egg-stage and, on average, host clutch-size was reduced by 10% per parasitic event. However, contrary to our expectations, we did not find any clear effect of parasitism on hatching success, nestling survival and body mass at fledging of Baywings. Our results suggest that, despite its high frequency, parasitism by Screaming Cowbirds has a rather little effect on the viability of Baywing offspring. We discuss how clutch rejection behaviour and flexible nest-provisioning rules of the hosts might help to explain this paradoxical result. © 2014 BirdLife Australia.

Registro:

Documento: Artículo
Título:High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing
Autor:De Mársico, M.C.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución, IEGEBA-CONICET, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina
Palabras clave:Baywing; brood parasitism; host use; Molothrus; reproductive success; body mass; brood parasitism; fledging; host use; host-parasite interaction; passerine; reproductive cost; reproductive success; specialist; survival; Argentina; Molothrus
Año:2014
Volumen:114
Número:4
Página de inicio:309
Página de fin:316
DOI: http://dx.doi.org/10.1071/MU14008
Título revista:Emu
Título revista abreviado:Emu
ISSN:01584197
CODEN:EMUMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v114_n4_p309_DeMarsico

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Citas:

---------- APA ----------
De Mársico, M.C. & Reboreda, J.C. (2014) . High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing. Emu, 114(4), 309-316.
http://dx.doi.org/10.1071/MU14008
---------- CHICAGO ----------
De Mársico, M.C., Reboreda, J.C. "High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing" . Emu 114, no. 4 (2014) : 309-316.
http://dx.doi.org/10.1071/MU14008
---------- MLA ----------
De Mársico, M.C., Reboreda, J.C. "High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing" . Emu, vol. 114, no. 4, 2014, pp. 309-316.
http://dx.doi.org/10.1071/MU14008
---------- VANCOUVER ----------
De Mársico, M.C., Reboreda, J.C. High frequency but low impact of brood parasitism by the specialist Screaming Cowbird on its primary host, the Baywing. Emu. 2014;114(4):309-316.
http://dx.doi.org/10.1071/MU14008