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Abstract:

Two possible patterns of bias in primary sex ratio have been proposed for size-dimorphic brood parasites that do not evict host chicks: (1) larger males should be laid at greater frequency in hosts larger than the parasite because they compete better (increasing their survival) than females with large host nest-mates, and (2) more costly males (i.e. the larger sex) should be laid at greater frequency in hosts smaller than the parasite because, in these hosts, parasite nestlings are provisioned at a higher rate and grow faster than in larger hosts. We tested these hypotheses in two hosts of the sexually size-dimorphic shiny cowbird, Molothrus bonariensis, one smaller (house wren, Troglodytes aedon) and one larger (chalk-browed mockingbird, Mimus saturninus) than the parasite. We measured: (1) sex ratio at laying; (2) development of sexual differences in body mass during the nestling stage; and (3) chick survival and sex ratio of chicks before fledging. In both hosts, we found sexual differences in body mass of nestlings from 7 days of age onwards, although we did not find a bias in the sex ratio of eggs laid and chicks fledged. The results of the present study do not support the hypothesis that shiny cowbird females benefit from biasing the primary sex ratio depending on the size of the hosts they parasitize. © 2013 The Linnean Society of London.

Registro:

Documento: Artículo
Título:Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
Autor:Tuero, D.T.; Fiorini, V.D.; Mahler, B.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Buenos Aires, C1428EGS, Argentina
Palabras clave:Brood parasitism; Chick survival; Growth curves; Sexual differences; age; body mass; brood parasitism; fledging; growth curve; nestling; parasite; passerine; sex ratio; sexual dimorphism; survival; Mimus saturninus; Molothrus bonariensis; Troglodytes; Troglodytes aedon
Año:2013
Volumen:110
Número:2
Página de inicio:442
Página de fin:448
DOI: http://dx.doi.org/10.1111/bij.12130
Handle:http://hdl.handle.net/20.500.12110/paper_00244066_v110_n2_p442_Tuero
Título revista:Biological Journal of the Linnean Society
Título revista abreviado:Biol. J. Linn. Soc.
ISSN:00244066
CODEN:BJLSB
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00244066_v110_n2_p442_Tuero.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244066_v110_n2_p442_Tuero

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Citas:

---------- APA ----------
Tuero, D.T., Fiorini, V.D., Mahler, B. & Reboreda, J.C. (2013) . Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?. Biological Journal of the Linnean Society, 110(2), 442-448.
http://dx.doi.org/10.1111/bij.12130
---------- CHICAGO ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. "Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?" . Biological Journal of the Linnean Society 110, no. 2 (2013) : 442-448.
http://dx.doi.org/10.1111/bij.12130
---------- MLA ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. "Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?" . Biological Journal of the Linnean Society, vol. 110, no. 2, 2013, pp. 442-448.
http://dx.doi.org/10.1111/bij.12130
---------- VANCOUVER ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?. Biol. J. Linn. Soc. 2013;110(2):442-448.
http://dx.doi.org/10.1111/bij.12130