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Abstract:

Interspecific brood parasitism is a strong selective force that has favoured the evolution of anti-parasite strategies. The Shiny Cowbird Molothrus bonariensis is a generalist parasite that uses more than 200 species as hosts. Scarlet-headed Blackbirds Amblyramphus holosericeus are infrequently parasitized by Shiny Cowbirds in contrast to other sympatric marshbird species that are heavily parasitized. In this paper, we attempted to identify specific anti-parasite defences of the Scarlet-headed Blackbird. Parasitism by Shiny Cowbirds of Scarlet-headed Blackbirds averaged 14.2%, whereas in Brown-and-yellow Marshbirds Pseudoleistes virescens, a sympatric marsh-nesting species, it was 52%. Both host species reared Shiny Cowbird chicks. Scarlet-headed Blackbird did not reject artificially added parasite eggs and did not respond more aggressively toward a female Shiny Cowbrid dummy model than to control species, the Yellow-winged Blackbird Agelaius thilius or the Brown-and-yellow Marshbird. However, high levels of nest attentiveness were recorded during nest-building, egg-laying and incubation stages. About 95-98% of the time at least one parent remained less than 20 m from the nest. Our results show that the low frequency of parasitism on the Scarlet-headed Blackbird may be better explained by life-history traits such as territorial defence, rather than by evolved anti-parasite strategies.

Registro:

Documento: Artículo
Título:Low frequency of Shiny Cowbird parasitism on Scarlet-headed Blackbirds: Anti-parasite adaptations or nonspecific host life-history traits?
Autor:Mermoz, M.E.; Fernández, G.J.
Filiación:Inst. de Biol. y Med. Exp. - CONICET, Vuelta de Obligado 2490, (1428) Buenos Aires, Argentina
Palabras clave:defense mechanism; parasitism; passerine; Agelaius thilius; Agelaius thilius; Amblyramphus holosericeus; Amblyramphus holosericeus; Gallus gallus; Molothrus bonariensis; Molothrus bonariensis; Passeriformes; Pseudoleistes virescens; Turdus merula
Año:1999
Volumen:30
Número:1
Página de inicio:15
Página de fin:22
DOI: http://dx.doi.org/10.2307/3677238
Título revista:Journal of Avian Biology
Título revista abreviado:J. Avian Biol.
ISSN:09088857
CODEN:JAVBE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09088857_v30_n1_p15_Mermoz

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Citas:

---------- APA ----------
Mermoz, M.E. & Fernández, G.J. (1999) . Low frequency of Shiny Cowbird parasitism on Scarlet-headed Blackbirds: Anti-parasite adaptations or nonspecific host life-history traits?. Journal of Avian Biology, 30(1), 15-22.
http://dx.doi.org/10.2307/3677238
---------- CHICAGO ----------
Mermoz, M.E., Fernández, G.J. "Low frequency of Shiny Cowbird parasitism on Scarlet-headed Blackbirds: Anti-parasite adaptations or nonspecific host life-history traits?" . Journal of Avian Biology 30, no. 1 (1999) : 15-22.
http://dx.doi.org/10.2307/3677238
---------- MLA ----------
Mermoz, M.E., Fernández, G.J. "Low frequency of Shiny Cowbird parasitism on Scarlet-headed Blackbirds: Anti-parasite adaptations or nonspecific host life-history traits?" . Journal of Avian Biology, vol. 30, no. 1, 1999, pp. 15-22.
http://dx.doi.org/10.2307/3677238
---------- VANCOUVER ----------
Mermoz, M.E., Fernández, G.J. Low frequency of Shiny Cowbird parasitism on Scarlet-headed Blackbirds: Anti-parasite adaptations or nonspecific host life-history traits?. J. Avian Biol. 1999;30(1):15-22.
http://dx.doi.org/10.2307/3677238