Newly emerged Batesian mimicry protects only unfamiliar prey |
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Authors: | Petr Veselý Roman Fuchs |
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Institution: | 1. Department of Zoology, Faculty of Biological Sciences, University of South Bohemia, Brani?ovská 31, 370 05, èeské Budìjovice, Czech Republic
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Abstract: | The evolution of Batesian mimicry was tested experimentally using avian predators. We investigated the effect of a search
image on the protection effectiveness of a newly emerged Batesian mimic. The two groups of predators (adult great tits, Parus major) differed in prior experience with prey from which the mimic evolved. The Guyana spotted roach (Blaptica dubia) was used as a palatable prey from which the mimic emerged, and red firebug (Pyrrhocoris apterus) was used as a model. Optical signalization of the insect prey was modified by a paper sticker placed on its back. The cockroaches
with the firebug pattern sticker were significantly better protected against tits with no prior experience with cockroaches.
The protection of the firebug sticker was equally effective on cockroaches as it was on firebugs. The cockroaches with firebug
stickers were not protected against attacks of tits, which were familiar with unmodified cockroaches better than cockroaches
with a cockroach sticker. We suppose that pre-trained tits acquired the search image of a cockroach, which helped them to
reveal the “fake” Batesian mimic. Such a constraint of Batesian mimicry effectiveness could substantially decrease the probability
of evolution of pure Batesian mimic systems. |
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