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No predatory bias with respect to colour familiarity for the aposematic Adelphobates galactonotus (Anura: Dendrobatidae)

In: Behaviour
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  • 1 aCoordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, P.O. Box 2223, 69011-970 Manaus, AM, Brazil
  • | 2 bDepartment of Biological Sciences, Macquarie University, Sydney, NSW, Australia
  • | 3 cDepartment of Biological Sciences, Universidad de los Andes, Bogotá, Colombia
  • | 4 dLaboratório de Sistemática de Vertebrados, Pontificia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Aposematic colouration deters visually oriented predators because conspicuous signals are easier to detect and associate with unpalatability. Consequently, brightly coloured prey that are novel are predicted to be preyed on more than those with bright but typical colours. Here we evaluated whether predatory bias is associated with the colour differences observed at two different localities for a large, conspicuously coloured and poisonous Amazonian frog, Adelphobates galactonotus. At each locality predation experiments were carried out using frog models of two naturally occurring colours of the study species (blue and orange) and a control (brown). We found no evidence that novel colours were more vulnerable to predation than local colours. These results do not therefore support our hypothesis that predatory bias explains the geographic variation of colour in A. galactonotus.

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