Signal detectability and boldness are not the same: the function of defensive coloration in nudibranchs is distance-dependent.

ABSTRACT: Aposematic signals visually advertise underlying anti-predatory defences in many species. They should be detectable (e.g. contrasting against the background) and bold (e.g. using internal pattern contrast) to enhance predator recognition, learning and memorization. However, the signalling function of aposematic colour patterns may be distance-dependent: signals may be undetectable from a distance to reduce increased attacks from naïve predators but bold when viewed up close. Using quantitative colour pattern analysis, we quantified the chromatic and achromatic detectability and boldness of colour patterns in 13 nudibranch species with variable strength of chemical defences in terms of unpalatability and toxicity, approximating the visual perception of a triggerfish (Rhinecanthus aculeat

SUBMITTER: van den Berg CP 

PROVIDER: S-EPMC10369023 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature