Distance-dependent pattern blending can camouflage salient aposematic signals

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

The effect of viewing distance on the perception of visual texture is well known: spatial frequencies higher than the resolution limit of an observer’s visual system will be summed and perceived as a single combined colour. In animal defensive colour patterns, distance-dependent pattern blending may allow aposematic patterns, salient at close range, to match the background to distant observers. Indeed, recent research has indicated that reducing the distance from which a salient signal can be detected can increase survival over camouflage or conspicuous aposematism alone. We investigated whether the spatial frequency of conspicuous and cryptically coloured stripes affects the rate of avian predation. Our results are consistent with pattern blending acting to camouflage salient aposematic signals effectively at a distance. Experiments into the relative rate of avian predation on edible model caterpillars found that increasing spatial frequency (thinner stripes) increased survival. Similarly, visual modelling of avian predators showed that pattern blending increased the similarity between caterpillar and background. These results show how a colour pattern can be tuned to reveal or conceal different information at different distances, and produce tangible survival benefits.
Original languageEnglish
Article number20170128
Number of pages6
JournalProceedings of the Royal Society B: Biological Sciences
Volume284
Issue number1858
Early online date5 Jul 2017
DOIs
Publication statusPublished - 12 Jul 2017

Structured keywords

  • Cognitive Science
  • Visual Perception

Keywords

  • aposematism
  • camouflage
  • defensive colouration
  • distance
  • visual ecology
  • warning signals

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