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Abstract:

We studied Creamy-bellied Thrush (Turdus amaurochalinus) defenses against brood parasitism by Shiny Cowbirds (Molothrus bonariensis). Shiny Cowbirds decrease the reproductive success of Creamy-bellied Thrushes, and having historical habitats and ranges that overlap, we expected that thrushes possess antiparasitic defenses. We analyzed nest attendance during prelaying, laying and incubation; responses to the presentation of a model of a female cowbird or a control species close to the nest; nest abandonment associated with parasitism; and responses to experimental parasitism with white or spotted cowbird eggs (with or without the simultaneous presentation of a female cowbird model). Nest attendance was 58%-68% during prelaying and 83%-90% during laying and incubation. Thrushes had a shorter latency in returning near the nest and visited nests more frequently when we presented the cowbird model than the control model. The frequency of abandonment of parasitized nests was low and was not temporally associated with parasitism. Thrushes ejected white eggs more frequently than spotted eggs when parasitism was associated with the presentation of the cowbird model, but there were no differences when the model was absent. Our results indicate that Creamy-bellied Thrushes recognize cowbirds as a threat and eject white but not spotted cowbird eggs. We postulate that the low impact of cowbird parasitism on thrush hatching success and chick survival and the likelihood of recognition errors when parasite eggs resemble host eggs may have prevented the evolution of egg ejection in this host. © The Cooper Ornithological Society 2005.

Registro:

Documento: Artículo
Título:Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism
Autor:Astie, A.A.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética Y Evolución, Facultad de Ciencias Exactas Y Naturales, Pabellón II Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Antiparasitic defenses; Brood parasitism; Creamy-bellied Thrush; Molothrus bonariensis; Shiny Cowbird; Turdus amaurochalinus; Molothrus; Molothrus bonariensis; Turdidae; Turdus amaurochalinus
Año:2005
Volumen:107
Número:4
Página de inicio:788
Página de fin:796
DOI: http://dx.doi.org/10.1650/7733.1
Título revista:Condor
Título revista abreviado:Condor
ISSN:00105422
CODEN:CNDRA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v107_n4_p788_Astie

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Citas:

---------- APA ----------
Astie, A.A. & Reboreda, J.C. (2005) . Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism. Condor, 107(4), 788-796.
http://dx.doi.org/10.1650/7733.1
---------- CHICAGO ----------
Astie, A.A., Reboreda, J.C. "Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism" . Condor 107, no. 4 (2005) : 788-796.
http://dx.doi.org/10.1650/7733.1
---------- MLA ----------
Astie, A.A., Reboreda, J.C. "Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism" . Condor, vol. 107, no. 4, 2005, pp. 788-796.
http://dx.doi.org/10.1650/7733.1
---------- VANCOUVER ----------
Astie, A.A., Reboreda, J.C. Creamy-bellied Thrush defenses against Shiny Cowbird brood parasitism. Condor. 2005;107(4):788-796.
http://dx.doi.org/10.1650/7733.1