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Abstract:

Obligate avian brood parasites do not provide direct care to their young but can indirectly increase their offspring's success in host nests. One way in which parasitic cowbirds (Molothrus sp.) could achieve this is through egg puncturing, whereby, prior to laying in a nest, females puncture the eggs that are already present in the nest to reduce the competition that their offspring will later face for food. In this study we investigated whether cowbirds strategically increase their puncturing effort with increasing competitiveness of the future brood. We filmed egg-puncturing behaviour by shiny cowbirds, Molothrus bonariensis, at nests of chalk-browed mockingbirds, Mimus saturninus, a large host whose nests often receive multiple cowbird eggs. We presented cowbirds with large (4 eggs) or small (1 egg) clutches of either mockingbird or cowbird eggs, where large clutch sizes predict greater intrabrood competition than small clutch sizes, and mockingbird eggs (which are larger) predict greater competition than other cowbird eggs. Cowbirds delivered more pecks and punctured more eggs per visit to larger clutches, and mockingbird eggs were broken more often than cowbird eggs, but pecked less per visit. The higher number of pecks aimed at cowbird eggs, despite these producing less competitive nestmates, could reflect responses to eggshell strength rather than egg size, as cowbird eggs are harder to break because of their thicker shells and so require more effort to puncture. Our results show that cowbird puncturing behaviour is not rigid and varies with nest contents. We suggest this variation is consistent with females increasing their offspring's chance of survival. © 2014 The Association for the Study of Animal Behaviour.

Registro:

Documento: Artículo
Título:Strategic egg destruction by brood-parasitic cowbirds?
Autor:Fiorini, V.D.; Gloag, R.; Kacelnik, A.; Reboreda, J.C.
Filiación:Departamento de Ecología, Genética y Evolución and oIEGEBA-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Buenos Aires, Argentina
Department of Zoology, University of Oxford, Oxford, United Kingdom
Palabras clave:Brood parasitism; Egg pecking; Egg puncture; Egg strength; Molothrus bonariensis; Shiny cowbird; behavioral response; brood parasitism; clutch size; competitive ability; damage; eggshell; interspecific competition; parental care; passerine
Año:2014
Volumen:93
Página de inicio:229
Página de fin:235
DOI: http://dx.doi.org/10.1016/j.anbehav.2014.04.038
Título revista:Animal Behaviour
Título revista abreviado:Anim. Behav.
ISSN:00033472
CODEN:ANBEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00033472_v93_n_p229_Fiorini

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Citas:

---------- APA ----------
Fiorini, V.D., Gloag, R., Kacelnik, A. & Reboreda, J.C. (2014) . Strategic egg destruction by brood-parasitic cowbirds?. Animal Behaviour, 93, 229-235.
http://dx.doi.org/10.1016/j.anbehav.2014.04.038
---------- CHICAGO ----------
Fiorini, V.D., Gloag, R., Kacelnik, A., Reboreda, J.C. "Strategic egg destruction by brood-parasitic cowbirds?" . Animal Behaviour 93 (2014) : 229-235.
http://dx.doi.org/10.1016/j.anbehav.2014.04.038
---------- MLA ----------
Fiorini, V.D., Gloag, R., Kacelnik, A., Reboreda, J.C. "Strategic egg destruction by brood-parasitic cowbirds?" . Animal Behaviour, vol. 93, 2014, pp. 229-235.
http://dx.doi.org/10.1016/j.anbehav.2014.04.038
---------- VANCOUVER ----------
Fiorini, V.D., Gloag, R., Kacelnik, A., Reboreda, J.C. Strategic egg destruction by brood-parasitic cowbirds?. Anim. Behav. 2014;93:229-235.
http://dx.doi.org/10.1016/j.anbehav.2014.04.038