Abstract
Brood parasitism imposes several fitness costs on the host species. To reduce these costs, hosts of avian brood parasites have evolved various defenses, of which egg rejection is the most prevalent. In the face of variable host-parasite mimicry and the costs of egg discrimination itself, many hosts reject only some foreign eggs. Here, we experimentally varied the recognition cues to study the underlying cognitive mechanisms used by the Chalk-browed Mockingbird (Mimus saturninus) to reject the white immaculate eggs laid by the parasitic Shiny Cowbird (Molothrus bonariensis). Immaculate eggs are the only parasite eggs rejected by this host, as it accepts all polymorphic, spotted eggs laid by cowbirds. Using a within-breeding pair experimental design, we tested for the salience of spotting, UV reflectance, and brightness in eliciting rejection. We found that the presence of spotting significantly decreased the probability of rejection while increments in brightness significantly increased rejection frequencies. The cognitive rules underlying mockingbird rejection behavior can be explained by a decision-making model which predicts changes in the levels of rejection in direct relation to the number of relevant attributes shared between host and parasite eggs.
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Acknowledgments
We thank Fundación Elsa Shaw de Pearson for allowing us to conduct this study at the “Reserva El Destino.” We also thank Martín Rossi for statistical support and Tomas Grim for his help in various aspects of this study. MAdlC was supported by a fellowship of the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT). BM, LP, and JCR are research fellows of the Consejo Nacional de Investigaciones Científicas y Técnicas. We thank the New Zealand Royal Society (ISAT), the PSC-CUNY grant funds, and the Human Frontier Science Program for additional funding to BM and MEH. This work was supported by grants from ANPCyT and Universidad de Buenos Aires.
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de la Colina, M.A., Pompilio, L., Hauber, M.E. et al. Different recognition cues reveal the decision rules used for egg rejection by hosts of a variably mimetic avian brood parasite. Anim Cogn 15, 881–889 (2012). https://doi.org/10.1007/s10071-012-0515-9
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DOI: https://doi.org/10.1007/s10071-012-0515-9