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Abstract:

Abstract: Shiny cowbirds (Molothrus bonariensis) are generalist brood parasites that use hosts varying in body and egg size. On the contrary, screaming cowbirds (M. rufoaxillaris), which are larger than shiny cowbirds, are host specialist that use mainly one host of similar body and egg size. Both parasites peck and puncture eggs when visiting nests. Through puncturing eggs, cowbirds can reduce the competition for food their chicks face (reduction of competition hypothesis), but the same behavior could also be a mechanism to enforce host to renest when nests are found late in the nesting cycle (farming hypothesis). Eggshell strength increases the difficulty to puncture eggs and therefore may modulate egg-pecking behavior. To test these hypotheses, we studied the effect of the degree of clutch completion and egg size on egg-puncturing behavior. Moreover, we evaluated if morphological differences between cowbird species and eggshell strength affected egg-pecking behavior. We presented captive females a nest with complete (four eggs) or incomplete (one egg) clutches of house wren (small egg size, low eggshell strength), chalk-browed mockingbird (large egg size, intermediate eggshell strength), or shiny cowbird (medium egg size, high eggshell strength). The proportion of nests with punctured eggs was similar for complete and incomplete clutches. Cowbirds punctured more eggs in complete than in incomplete clutches, but in complete clutches, they did not destroy the entire clutch. There were no differences in the egg-pecking behavior between cowbird species, which pecked more frequently the eggs with the strongest eggshell. Our findings are consistent with the reduction of competition hypothesis. Significance statement: Brood parasitic birds do not build nests and raise their chicks. Instead, they lay eggs in nests of other species (hosts), which carry out all parental care. Some brood parasites, like the cowbirds, peck and puncture eggs when they visit host nests. This behavior may help to reduce the competition for food that their chicks face in the nest (reduction of competition hypothesis) or may enforce hosts to renest (farming hypothesis). We experimentally studied egg-pecking and egg-puncturing behaviors in the host generalist shiny cowbird and the host specialist screaming cowbird. We found that the degree of clutch completion and egg size modulate egg-puncturing behavior and eggshell strength modulates egg-pecking behavior. Our results indicate that by puncturing eggs, cowbirds reduce nest competition. © 2017, Springer-Verlag Berlin Heidelberg.

Registro:

Documento: Artículo
Título:Egg pecking and puncturing behaviors in shiny and screaming cowbirds: effects of eggshell strength and degree of clutch completion
Autor:Cossa, N.A.; Tuero, D.T.; Reboreda, J.C.; Fiorini, V.D.
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, Argentina
Palabras clave:Brood parasitism; Farming hypothesis; Molothrus bonariensis; Molothrus rufoaxillaris; Reduction of competition hypothesis; brood parasitism; clutch size; egg size; eggshell; generalist; hypothesis testing; nesting behavior; passerine; specialist; Aves; Molothrus; Molothrus bonariensis; Molothrus rufoaxillaris; Troglodytes
Año:2017
Volumen:71
Número:4
DOI: http://dx.doi.org/10.1007/s00265-017-2289-1
Título revista:Behavioral Ecology and Sociobiology
Título revista abreviado:Behav. Ecol. Sociobiol.
ISSN:03405443
CODEN:BESOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03405443_v71_n4_p_Cossa

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Citas:

---------- APA ----------
Cossa, N.A., Tuero, D.T., Reboreda, J.C. & Fiorini, V.D. (2017) . Egg pecking and puncturing behaviors in shiny and screaming cowbirds: effects of eggshell strength and degree of clutch completion. Behavioral Ecology and Sociobiology, 71(4).
http://dx.doi.org/10.1007/s00265-017-2289-1
---------- CHICAGO ----------
Cossa, N.A., Tuero, D.T., Reboreda, J.C., Fiorini, V.D. "Egg pecking and puncturing behaviors in shiny and screaming cowbirds: effects of eggshell strength and degree of clutch completion" . Behavioral Ecology and Sociobiology 71, no. 4 (2017).
http://dx.doi.org/10.1007/s00265-017-2289-1
---------- MLA ----------
Cossa, N.A., Tuero, D.T., Reboreda, J.C., Fiorini, V.D. "Egg pecking and puncturing behaviors in shiny and screaming cowbirds: effects of eggshell strength and degree of clutch completion" . Behavioral Ecology and Sociobiology, vol. 71, no. 4, 2017.
http://dx.doi.org/10.1007/s00265-017-2289-1
---------- VANCOUVER ----------
Cossa, N.A., Tuero, D.T., Reboreda, J.C., Fiorini, V.D. Egg pecking and puncturing behaviors in shiny and screaming cowbirds: effects of eggshell strength and degree of clutch completion. Behav. Ecol. Sociobiol. 2017;71(4).
http://dx.doi.org/10.1007/s00265-017-2289-1