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Abstract:

Shiny Cowbirds Molothrus bonariensis and Screaming Cowbirds Molothrus rufoaxillaris are closely related brood parasites but the former is socially polygynous or promiscuous and an extreme host generalist, whereas the latter is socially monogamous and parasitizes almost exclusively one host. Females of both species lay in relative darkness, before dawn, relying for host nest location on previous days’ prospecting activity, or possibly on following better-informed roost associates. We studied the temporal and spatial patterns of roosting behaviour in these species to test the hypothesis that roosting behaviour of cowbirds is related to their breeding strategy (brood parasitism) and reflects differences in strategies between species. We recorded fidelity to a roost, location fidelity within a roost, inter-individual spatial associations and timing of roost departures and parasitic events, using tagged individuals. Female Shiny Cowbirds and both sexes of Screaming Cowbirds showed marked fidelity in roosting location, and roost departures occurred both during and after the known time window for parasitism, with earlier departures probably corresponding to laying days. Screaming Cowbird females and males that were trapped together and showed high levels of association during the day, also showed high levels of association in the roost. We describe the spatial and temporal patterns of a relatively poorly known aspect of avian ecology in general and the behaviour of brood parasites in particular. © 2018 British Ornithologists’ Union

Registro:

Documento: Artículo
Título:Roosting behaviour is related to reproductive strategy in brood parasitic cowbirds
Autor:Scardamaglia, R.C.; Kacelnik, A.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución & IEGEBA-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Buenos Aires, C1428EGA, Argentina
Department of Zoology, University of Oxford, Oxford, OX1 3PS, United Kingdom
Palabras clave:bird assemblage; Molothrus; radio-tracking; site fidelity; space use; annual variation; brood parasitism; parasitism; passerine; reproductive strategy; roosting; site fidelity; space use; tracking; Aves; Molothrus; Molothrus bonariensis; Molothrus rufoaxillaris
Año:2018
Volumen:160
Número:4
Página de inicio:779
Página de fin:789
DOI: http://dx.doi.org/10.1111/ibi.12587
Título revista:Ibis
Título revista abreviado:Ibis
ISSN:00191019
CODEN:IBISA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191019_v160_n4_p779_Scardamaglia

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Citas:

---------- APA ----------
Scardamaglia, R.C., Kacelnik, A. & Reboreda, J.C. (2018) . Roosting behaviour is related to reproductive strategy in brood parasitic cowbirds. Ibis, 160(4), 779-789.
http://dx.doi.org/10.1111/ibi.12587
---------- CHICAGO ----------
Scardamaglia, R.C., Kacelnik, A., Reboreda, J.C. "Roosting behaviour is related to reproductive strategy in brood parasitic cowbirds" . Ibis 160, no. 4 (2018) : 779-789.
http://dx.doi.org/10.1111/ibi.12587
---------- MLA ----------
Scardamaglia, R.C., Kacelnik, A., Reboreda, J.C. "Roosting behaviour is related to reproductive strategy in brood parasitic cowbirds" . Ibis, vol. 160, no. 4, 2018, pp. 779-789.
http://dx.doi.org/10.1111/ibi.12587
---------- VANCOUVER ----------
Scardamaglia, R.C., Kacelnik, A., Reboreda, J.C. Roosting behaviour is related to reproductive strategy in brood parasitic cowbirds. Ibis. 2018;160(4):779-789.
http://dx.doi.org/10.1111/ibi.12587