A Mechanism for Diversity in Warning Signals: Conspicuousness versus Toxicity in Poison Frogs

Many animals advertise their chemical defense to predators with conspicuous coloration and unpalatability, but little is known about the information in these signal elements. To effectively avoid predation, is it more advantageous to invest in increased conspicuousness or greater noxiousness, or to...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2006-04, Vol.103 (15), p.5852-5857
Main Authors: Darst, Catherine R., Cummings, Molly E., Cannatella, David C.
Format: Article
Language:English
Subjects:
Animal communication
Animals
Animals, Poisonous
Anura
Avoidance Learning
Behavior, Animal - physiology
Biological Sciences
Colors
Evolution
Frogs
Genetic Variation
Learning rate
Mimicry
Poisons
Predation
Predators
Predatory Behavior
Spectral reflectance
Toxicity
Warning systems
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Summary:Many animals advertise their chemical defense to predators with conspicuous coloration and unpalatability, but little is known about the information in these signal elements. To effectively avoid predation, is it more advantageous to invest in increased conspicuousness or greater noxiousness, or to allocate equally to both signal modalities? Using natural variation among poison frog species measured with spectral reflectance and toxicity assays, we tested the relative importance of warning signal components with predator-learning and avoidance experiments. We demonstrate that closely related species use alternative strategies: increasing either conspicuousness or toxicity affords equivalent avoidance by predators and provides protection to nontoxic mimic species. These equally effective predator avoidance tactics demonstrate different aposematic solutions for two potentially costly signal components, providing a mechanism for natural diversity in warning signals.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0600625103