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Abstract:

The reproductive success of parasitic cowbirds (Molothrus spp.) varies among host species and is influenced by the degree of synchronization in timing of egg laying, the duration of parasite and host incubation periods, and the ability of hosts to incubate and rear parasite young. We studied the reproductive success of Shiny Cowbirds (Molothrus bonariensis) that parasitized the nests of Creamy-bellied Thrushes (Turdus amaurochalinus) in the Monte desert region of Argentina. Shiny Cowbirds frequently parasitized Creamy-bellied Thrush nests (60%), and most cowbirds synchronized egg laying with that of thrushes (79%). Most parasitic eggs (80%) hatched within 1 d of the hatching of the first host egg, and more than 91% of the eggs survived until the end of the incubation. However, only 60% of the cowbird eggs hatched and 52% of young survived. The proportion of Shiny Cowbirds eggs laid in Creamy-bellied Thrush nests that resulted in fledged young was 0.03, including eggs and young lost due to predation or desertion. Despite this low reproductive success, Creamy-bellied Thrushes were heavily parasitized by Shiny Cowbirds in our study area. Shiny Cowbirds may continue to parasitize these thrushes because of diffuse selection or because Shiny Cowbird chicks are more likely to fledge from Creamy-bellied Thrush nests in years or areas with greater food availability when brood reduction does not occur. copy;2009 Association of Field Ornithologists.

Registro:

Documento: Artículo
Título:Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success
Autor:Astié, A.A.; Reboreda, J.C.
Filiación:IADIZA-CONICET, Av. Adrián Ruiz Leal s/n, 5500 Mendoza, Argentina
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EGA Buenos Aires, Argentina
Palabras clave:Brood parasitism; Creamy-bellied Thrush; Life history; Molothrus bonariensis; Reproductive success; Shiny Cowbird; Turdus amaurochalinus; Molothrus; Molothrus bonariensis; Turdidae; Turdus amaurochalinus
Año:2009
Volumen:80
Número:3
Página de inicio:224
Página de fin:233
DOI: http://dx.doi.org/10.1111/j.1557-9263.2009.00225.x
Título revista:Journal of Field Ornithology
Título revista abreviado:J. Field Ornithol.
ISSN:02738570
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02738570_v80_n3_p224_Astie

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Citas:

---------- APA ----------
Astié, A.A. & Reboreda, J.C. (2009) . Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success. Journal of Field Ornithology, 80(3), 224-233.
http://dx.doi.org/10.1111/j.1557-9263.2009.00225.x
---------- CHICAGO ----------
Astié, A.A., Reboreda, J.C. "Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success" . Journal of Field Ornithology 80, no. 3 (2009) : 224-233.
http://dx.doi.org/10.1111/j.1557-9263.2009.00225.x
---------- MLA ----------
Astié, A.A., Reboreda, J.C. "Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success" . Journal of Field Ornithology, vol. 80, no. 3, 2009, pp. 224-233.
http://dx.doi.org/10.1111/j.1557-9263.2009.00225.x
---------- VANCOUVER ----------
Astié, A.A., Reboreda, J.C. Shiny Cowbird parasitism of a low quality host: Effect of host traits on a parasite's reproductive success. J. Field Ornithol. 2009;80(3):224-233.
http://dx.doi.org/10.1111/j.1557-9263.2009.00225.x