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RESEARCH PRODUCT

Colour alone matters : no predator generalization among morphs of an aposematic moth

Katja RönkäSwanne P. GordonJohanna MappesChiara De PasqualBibiana Rojas

subject

varoitusväri0106 biological sciences0301 basic medicinepredatorspredator-prey interactionsoppiminengeneralisationta1172ZoologyAposematismBiologywarning coloration010603 evolutionary biology01 natural sciencestäpläsiilikäsgeneettinen monimuotoisuusPredationpolymorphism03 medical and health sciencesArctia plantaginisGeneralization (learning)petoeläimetmatkiminenmothsjäljittelyPredatorEcology Evolution Behavior and Systematicswood tigersaaliseläimetWinglearningCyanistesyöperhosetpredator–prey interactionswood tiger mothbiology.organism_classificationpredator generalization030104 developmental biologywarning signalsMimicryta1181Animal Science and Zoologyprey

description

Local warning colour polymorphism, frequently observed in aposematic organisms, is evolutionarily puzzling. This is because variation in aposematic signals is expected to be selected against due to predators' difficulties associating several signals with a given unprofitable prey. One possible explanation for the existence of such variation is predator generalization, which occurs when predators learn to avoid one form and consequently avoid other sufficiently similar forms, relaxing selection for monomorphic signals. We tested this hypothesis by exposing the three different colour morphs of the aposematic wood tiger moth, Arctia plantaginis, existing in Finland to local wild-caught predators (blue tits, Cyanistes caeruleus). We designed artificial moths that varied only in their hindwing coloration (white, yellow and red) keeping other traits (e.g. wing pattern and size) constant. Thus, if the birds transferred their aversion of one morph to the other two we could infer that their visual appearances are sufficiently similar for predator generalization to take place. We found that, surprisingly, birds showed no preference or aversion for any of the three morphs presented. During the avoidance learning trials, birds learned to avoid the red morph considerably faster than the white or yellow morphs, confirming previous findings on the efficacy of red as a warning signal that facilitates predator learning. Birds did not generalize their learned avoidance of one colour morph to the other two morphs, suggesting that they pay more attention to conspicuous wing coloration than other traits. Our results are in accordance with previous findings that coloration plays a key role during avoidance learning and generalization, which has important implications for the evolution of mimicry. We conclude that, in the case of wood tiger moths, predator generalization is unlikely to explain the unexpected coexistence of different morphs. peerReviewed

10.1016/j.anbehav.2017.11.015https://doi.org/10.1016/j.anbehav.2017.11.015