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Abstract:

Brood-parasitic cowbirds are hypothesized to search for and locate host nests within a relatively constant area, as this is presumed to facilitate the monitoring of nests over time and the synchronization of parasitism with host laying. We tested this hypothesis in Shiny Cowbirds (Molothrus bonariensis) and Screaming Cowbirds (M. rufoaxillaris), two cowbird species that differ in host specificity and, apparently, in social mating system, by radio-tracking females and males for 3-6 consecutive days and determining individual daily morning ranges and cumulative morning ranges. In Shiny Cowbirds, the mean size of morning daily ranges and cumulative morning ranges was larger for males than for females, but we did not find a difference between the sexes in range size for Screaming Cowbirds. In both species, there was extensive overlap in the morning ranges of individual females between consecutive days, and the addition of new area to their ranges decreased over time. For both Shiny and Screaming cowbirds, morning ranges of conspecific females radio-tracked the same day overlapped, indicating lack of territoriality. Male and female Screaming Cowbirds that were trapped together were also spatially associated during radio-tracking, indicating social monogamy. Most radio-tracked Shiny and Screaming cowbirds used mainly one roost, relatively close to their morning ranges, which was maintained throughout the breeding season. Our results show that Shiny and Screaming cowbird females use relatively constant areas for nest searching and that Screaming Cowbirds are socially monogamous. Copyright © 2014 American Ornithologists' Union.

Registro:

Documento: Artículo
Título:Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests
Autor:Scardamaglia, R.C.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución, and IEGEBA-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Brood parasitism; Molothrus bonariensis; Molothrus rufoaxillaris; Nest searching; Radio telemetry; Social monogamy; breeding season; brood parasitism; nesting behavior; passerine; range size; territoriality; Molothrus; Molothrus bonariensis; Molothrus rufoaxillaris
Año:2014
Volumen:131
Número:4
Página de inicio:610
Página de fin:618
DOI: http://dx.doi.org/10.1642/AUK-14-54.1
Título revista:Auk
Título revista abreviado:Auk
ISSN:00048038
CODEN:AUKJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v131_n4_p610_Scardamaglia

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Citas:

---------- APA ----------
Scardamaglia, R.C. & Reboreda, J.C. (2014) . Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests. Auk, 131(4), 610-618.
http://dx.doi.org/10.1642/AUK-14-54.1
---------- CHICAGO ----------
Scardamaglia, R.C., Reboreda, J.C. "Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests" . Auk 131, no. 4 (2014) : 610-618.
http://dx.doi.org/10.1642/AUK-14-54.1
---------- MLA ----------
Scardamaglia, R.C., Reboreda, J.C. "Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests" . Auk, vol. 131, no. 4, 2014, pp. 610-618.
http://dx.doi.org/10.1642/AUK-14-54.1
---------- VANCOUVER ----------
Scardamaglia, R.C., Reboreda, J.C. Ranging behavior of female and male Shiny Cowbirds and Screaming Cowbirds while searching for host nests. Auk. 2014;131(4):610-618.
http://dx.doi.org/10.1642/AUK-14-54.1