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• W2787202414 endingPage "170801" @default.
• W2787202414 startingPage "170801" @default.
• W2787202414 abstract "Countershading is a pattern of coloration thought to have evolved in order to implement camouflage. By adopting a pattern of coloration that makes the surface facing towards the sun darker and the surface facing away from the sun lighter, the overall amount of light reflected off an animal can be made more uniformly bright. Countershading could hence contribute to visual camouflage by increasing background matching or reducing cues to shape. However, the usefulness of countershading is constrained by a particular pattern delivering ‘optimal’ camouflage only for very specific lighting conditions. In this study, we test the robustness of countershading camouflage to lighting change due to weather, using human participants as a ‘generic’ predator. In a simulated three-dimensional environment, we constructed an array of simple leaf-shaped items and a single ellipsoidal target ‘prey’. We set these items in two light environments: strongly directional ‘sunny’ and more diffuse ‘cloudy’. The target object was given the optimal pattern of countershading for one of these two environment types or displayed a uniform pattern. By measuring detection time and accuracy, we explored whether and how target detection depended on the match between the pattern of coloration on the target object and scene lighting. Detection times were longest when the countershading was appropriate to the illumination; incorrectly camouflaged targets were detected with a similar pattern of speed and accuracy to uniformly coloured targets. We conclude that structural changes in light environment, such as caused by differences in weather, do change the effectiveness of countershading camouflage." @default.
• W2787202414 created "2018-02-23" @default.
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• W2787202414 date "2018-02-01" @default.
• W2787202414 modified "2023-10-12" @default.
• W2787202414 title "Is countershading camouflage robust to lighting change due to weather?" @default.
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• W2787202414 doi "https://doi.org/10.1098/rsos.170801" @default.
• W2787202414 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5830711" @default.
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• W2787202414 hasPublicationYear "2018" @default.
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