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Abstract:

In birds, egg size affects chick growth and survival and it is an important component of reproductive success. The shiny cowbird Molothrus bonariensis is an extreme generalist brood parasite that uses hosts with a wide range of body masses. Survival of cowbird chicks decreases with host body mass, as competition for food with nestmates is more intense in large than in small hosts. We studied variation in shiny cowbird egg size and chick growth in two hosts that differ markedly in body size: the chalk-browed mockingbird Mimus saturninus (70-75 g), and the house wren Troglodytes aedon (12-13 g). We analyzed: 1) if females parasitizing mockingbirds lay larger eggs than those parasitizing wrens, and 2) the association between egg size and chick growth. We experimentally controlled for time of parasitism and number of host chicks and evaluated growth rate of male and female parasite chicks. Shiny cowbirds parasitizing mockingbird nests laid larger eggs than those parasitizing wren nests. Chick body mass after hatching was positively associated with egg size until chicks were five days of age, but there was no association between egg size and growth rate, or asymptotic mass. There were no sexual differences in egg size or body mass at the time of hatching, but growth rate was higher in males than in females leading to sexual dimorphism in asymptotic mass. Differences in egg size between hosts and the effect of egg size on body mass after hatching support the hypothesis that different females are specialized in the use of hosts that differ in body mass. © 2012 The Authors.

Registro:

Documento: Artículo
Título:Shiny cowbird Molothrus bonariensis egg size and chick growth vary between two hosts that differ markedly in body size
Autor:Tuero, D.T.; Fiorini, V.D.; Mahler, B.; Reboreda, J.C.
Filiación:Depto de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Univ. de Buenos Aires, Pabellón II Ciudad Universitaria, C1428EGA, Buenos Aires, Argentina
Palabras clave:adaptation; body mass; body size; brood parasitism; competition (ecology); egg size; growth rate; hatching; host-parasite interaction; passerine; poultry; reproductive success; sexual dimorphism; specialization; survival; Aves; Mimus saturninus; Molothrus bonariensis; Troglodytes; Troglodytes aedon; Troglodytinae
Año:2012
Volumen:43
Número:3
Página de inicio:227
Página de fin:233
DOI: http://dx.doi.org/10.1111/j.1600-048X.2012.05596.x
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_v43_n3_p227_Tuero

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Citas:

---------- APA ----------
Tuero, D.T., Fiorini, V.D., Mahler, B. & Reboreda, J.C. (2012) . Shiny cowbird Molothrus bonariensis egg size and chick growth vary between two hosts that differ markedly in body size. Journal of Avian Biology, 43(3), 227-233.
http://dx.doi.org/10.1111/j.1600-048X.2012.05596.x
---------- CHICAGO ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. "Shiny cowbird Molothrus bonariensis egg size and chick growth vary between two hosts that differ markedly in body size" . Journal of Avian Biology 43, no. 3 (2012) : 227-233.
http://dx.doi.org/10.1111/j.1600-048X.2012.05596.x
---------- MLA ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. "Shiny cowbird Molothrus bonariensis egg size and chick growth vary between two hosts that differ markedly in body size" . Journal of Avian Biology, vol. 43, no. 3, 2012, pp. 227-233.
http://dx.doi.org/10.1111/j.1600-048X.2012.05596.x
---------- VANCOUVER ----------
Tuero, D.T., Fiorini, V.D., Mahler, B., Reboreda, J.C. Shiny cowbird Molothrus bonariensis egg size and chick growth vary between two hosts that differ markedly in body size. J. Avian Biol. 2012;43(3):227-233.
http://dx.doi.org/10.1111/j.1600-048X.2012.05596.x