Hanley, D.; López, A.V.; Fiorini, V.D.; Reboreda, J.C.; Grim, T.; Hauber, M.E. "Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis" (2019) Philosophical Transactions of the Royal Society B: Biological Sciences. 374(1769)
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The optimal acceptance threshold hypothesis provides a general predictive framework for testing behavioural responses to discrimination challenges. Decision-makers should respond to a stimulus when the perceived difference between that stimulus and a comparison template surpasses an acceptance threshold. We tested how individual components of a relevant recognition cue (experimental eggs) contributed to behavioural responses of chalk-browed mockingbirds, Mimus saturninus, a frequent host of the parasitic shiny cowbird, Molothrus bonariensis. To do this, we recorded responses to eggs that varied with respect to two components: colour, ranging from bluer to browner than the hosts’ own eggs, and spotting, either spotted like their own or unspotted. Although tests of this hypothesis typically assume that decisions are based on perceived colour dissimilarity between own and foreign eggs, we found that decisions were biased toward rejecting browner eggs. However, as predicted, hosts tolerated spotted eggs more than unspotted eggs, irrespective of colour. These results uncover how a single component of a multicomponent cue can shift a host’s discrimination threshold and illustrate how the optimal acceptance threshold hypothesis can be used as a framework to quantify the direction and amount of the shift (in avian perceptual units) of the response curve across relevant phenotypic ranges. This article is part of the theme issue ‘The coevolutionary biology of brood parasitism: from mechanism to pattern’. © 2019 The Author(s) Published by the Royal Society. All rights reserved.


Documento: Artículo
Título:Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis
Autor:Hanley, D.; López, A.V.; Fiorini, V.D.; Reboreda, J.C.; Grim, T.; Hauber, M.E.
Filiación:Department of Biology, Long Island University – Post, Brookville, NY 11548, United States
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Department of Zoology, Laboratory of Ornithology, Palacký University, Olomouc, 77146, Czech Republic
Department of Animal Biology, School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
Palabras clave:Acceptance threshold; Brood parasitism; Colour perception; Egg recognition; Aves; Mimus saturninus; Molothrus bonariensis
Título revista:Philosophical Transactions of the Royal Society B: Biological Sciences
Título revista abreviado:Philos. Trans. R. Soc. B Biol. Sci.


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---------- APA ----------
Hanley, D., López, A.V., Fiorini, V.D., Reboreda, J.C., Grim, T. & Hauber, M.E. (2019) . Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis. Philosophical Transactions of the Royal Society B: Biological Sciences, 374(1769).
---------- CHICAGO ----------
Hanley, D., López, A.V., Fiorini, V.D., Reboreda, J.C., Grim, T., Hauber, M.E. "Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis" . Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1769 (2019).
---------- MLA ----------
Hanley, D., López, A.V., Fiorini, V.D., Reboreda, J.C., Grim, T., Hauber, M.E. "Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis" . Philosophical Transactions of the Royal Society B: Biological Sciences, vol. 374, no. 1769, 2019.
---------- VANCOUVER ----------
Hanley, D., López, A.V., Fiorini, V.D., Reboreda, J.C., Grim, T., Hauber, M.E. Variation in multicomponent recognition cues alters egg rejection decisions: A test of the optimal acceptance threshold hypothesis. Philos. Trans. R. Soc. B Biol. Sci. 2019;374(1769).