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Abstract:

It is usually accepted that generalist brood parasites should avoid using hosts larger than themselves because host chicks may outcompete parasite chicks for food. We studied the interactions between the Shiny Cowbird (Molothrus bonariensis) and two common hosts larger than the parasite, the Chalk-browed Mockingbird (Mimus saturninus) and the Rufous-bellied Thrush (Turdus rufiventris). For each host we determined (1) frequency and intensity of parasitism during the breeding season, (2) nesting success, egg survival, hatching success, and chick survival in unparasitized and parasitized nests, and (3) antiparasitic defenses. We also determined Shiny Cowbird egg survival, hatching success, and chick survival in both hosts. Parasitism reached 50% in mockingbirds and 66% in thrushes. In both species the main cost of parasitism was egg destruction through punctures. Hatching success, survival of host chicks, and nest survival did not differ between unparasitized and parasitized nests. Both hosts rejected parasitic white-morph eggs but accepted spotted-morph ones, even though they were significantly smaller than host eggs. The proportion of cowbirds fledged per egg laid in successful mockingbird and thrush nests was 0.4 and 0.6, respectively. Considering nest survival, reproductive success of Shiny Cowbirds was 0.15 in mockingbird nests and 0.17 in thrush nests. These values are similar to or higher than cowbird success with smaller hosts. Our results indicate that host quality is not only determined by host-parasite differences in body size, and that other factors, such as host defenses and nest survivorship, should be considered.

Registro:

Documento: Artículo
Título:A comparative study of Shiny Cowbird parasitism of two large hosts, the Chalk-browed Mockingbird and the Rufous-bellied Thrush
Autor:Sackmann, P.; Reboreda, J.C.
Filiación:Laboratorio Ecotono, Ctro. Reg. Universitario Bariloche, Universidad Nacional del Comahue, Pasaje Gutierrez 1125, 8400 Bariloche, Argentina
Depto. de Ecologia, Genet. y Evol., Fac. de Ciencias Exactas y Naturales, Pabellón II Cd. Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Brood parasitism; Chalk-browed Mockingbird; Mimus saturninus; Molothrus bonariensis; Rufous-bellied Thrush; Shiny Cowbird; Turdus rufiventris; Mimus saturninus; Mimus saturninus; Molothrus; Molothrus bonariensis; Molothrus bonariensis; Turdidae; Turdus rufiventris; Turdus rufiventris
Año:2003
Volumen:105
Número:4
Página de inicio:728
Página de fin:736
DOI: http://dx.doi.org/10.1650/7194
Título revista:Condor
Título revista abreviado:Condor
ISSN:00105422
CODEN:CNDRA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00105422_v105_n4_p728_Sackmann

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Citas:

---------- APA ----------
Sackmann, P. & Reboreda, J.C. (2003) . A comparative study of Shiny Cowbird parasitism of two large hosts, the Chalk-browed Mockingbird and the Rufous-bellied Thrush. Condor, 105(4), 728-736.
http://dx.doi.org/10.1650/7194
---------- CHICAGO ----------
Sackmann, P., Reboreda, J.C. "A comparative study of Shiny Cowbird parasitism of two large hosts, the Chalk-browed Mockingbird and the Rufous-bellied Thrush" . Condor 105, no. 4 (2003) : 728-736.
http://dx.doi.org/10.1650/7194
---------- MLA ----------
Sackmann, P., Reboreda, J.C. "A comparative study of Shiny Cowbird parasitism of two large hosts, the Chalk-browed Mockingbird and the Rufous-bellied Thrush" . Condor, vol. 105, no. 4, 2003, pp. 728-736.
http://dx.doi.org/10.1650/7194
---------- VANCOUVER ----------
Sackmann, P., Reboreda, J.C. A comparative study of Shiny Cowbird parasitism of two large hosts, the Chalk-browed Mockingbird and the Rufous-bellied Thrush. Condor. 2003;105(4):728-736.
http://dx.doi.org/10.1650/7194