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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/37326

Title: Could a Factor That Does Not Affect Egg Recognition Influence the Decision of Rejection?
Authors: Ruiz-Raya, Francisco
Soler Cruz, Manuel
Sánchez-Pérez, Lucía Ll.
Ibáñez-Álamo, Juan Diego
Issue Date: 2015
Abstract: Rejection of the parasitic egg is the most important defence of hosts against brood parasites. However, this response is variable among and within species, and egg discrimination is not always followed by egg rejection. Low risk of parasitism and high risk of rejection costs may lead to the acceptance of the parasitic egg even if it has been previously recognized. The main aim of this paper is to answer a relevant question: can a single egg trait provoke the acceptance of an experimental egg previously recognized as foreign? Increased egg mass should hamper the ejection of an egg that has been discriminated because ejection of a heavy egg may imply higher rejection costs for hosts. We have tested this prediction by experimentally parasitizing natural nests of Common Blackbirds (Turdus merula) with non-mimetic model eggs of different mass (heavy, normal-weight, and light) while controlling for potential confounding factors such as egg size and colour. Our results showed that blackbirds more frequently accepted heavy eggs, even when previously recognized. This differential acceptance may be related to insufficient motivation to assume the higher costs that the ejection of a heavy egg could impose.
Sponsorship: Financial support has been provided by the Consejería Economía, Innovación, Ciencia y Empleo, Junta de Andalucia (research project CVI-6653).
Publisher: Public Library of Science (PLOS)
Keywords: Parasitism
Parasite evolution
Birds
Cognition
Generalized linear model
Imitation
Evolutionary adaptation
Evolutionary genetics
URI: http://hdl.handle.net/10481/37326
ISSN: 1932-6203
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Ruiz-Raya, F.; et al. Could a Factor That Does Not Affect Egg Recognition Influence the Decision of Rejection?. Plos One, 10(8): e0135624 (2015). [http://hdl.handle.net/10481/37326]
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