Abstract
ANIMAL signals are often 'multicomponent'1–3, consisting of displays with several parts to allow exploitation of different senses. An example is the courtship display of the peacock, which combines dashing movements with a noisy, shimmering show of his train feathers4. Yet the significance of multicomponent signalling is unknown. As a model multicomponent signalling system, we investigated the warning signals of toxic insects, which often combine pyrazine odours with conspicuous coloration such as yellow or red5–7. Here we demonstrate, in prey choice experiments with birds, that pyrazine interacts with red and yellow to induce strong aversions to these aposematic colours that are not shown in the absence of the odour. Pyrazine is shown neither to be inherently aversive, nor to induce aversion to a non-aposematic colour, green. To our knowledge, this study provides the first evidence that the function of multicomponent signals can lie in hidden psychological responses produced by the interaction of their components.
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Rowe, C., Guilford, T. Hidden colour aversions in domestic chicks triggered by pyrazine odours of insect warning displays. Nature 383, 520–522 (1996). https://doi.org/10.1038/383520a0
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DOI: https://doi.org/10.1038/383520a0
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