Jewelled spiders manipulate colour-lure geometry to deceive prey

Thomas E. White

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    Selection is expected to favour the evolution of efficacy in visual communication. This extends to deceptive systems, and predicts functional links between the structure of visual signals and their behavioural presentation. Work to date has primarily focused on colour, however, thereby understating the multicomponent nature of visual signals. Here I examined the relationship between signal structure, presentation behaviour, and efficacy in the context of colour-based prey luring. I used the polymorphic orb-web spider Gasteracantha fornicata, whose yellow- or white-and-black striped dorsal colours have been broadly implicated in prey attraction. In a manipulative assay, I found that spiders actively control the orientation of their conspicuous banded signals in the web, with a distinct preference for near-diagonal bearings. Further field-based study identified a predictive relationship between pattern orientation and prey interception rates, with a local maximum at the spiders' preferred orientation. There were no morph-specific effects on capture success, either singularly or via an interaction with pattern orientation. These results reveal a dynamic element in a traditionally ‘static’ signalling context, and imply differential functions for chromatic and geometric signal components across visual contexts. More broadly, they underscore how multicomponent signal designs and display behaviours may coevolve to enhance efficacy in visual deception.
    Original languageEnglish
    Pages (from-to)20170027-1-20170027-5
    Number of pages5
    JournalBiology Letters
    Volume13
    Issue number3
    DOIs
    Publication statusPublished - 31 Mar 2017

    Keywords

    • deception
    • communication
    • multicomponent signal
    • orb-web
    • Gasteracantha
    • multicomponent
    • signal

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