Orb-weaving spiders show a correlated syndrome of morphology and web structure in the wild

David N. Fisher*, Jonathan N. Pruitt, Justin Yeager

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Extended phenotypes are traits that exist outside the physical body of organisms. Despite their role in the lives of the organisms that express them and other organisms influenced by extended phenotypes, the consistency and covariance with morphological and behavioural traits of extended phenotypes has rarely been evaluated. We repeatedly measured an extended phenotype involved in prey acquisition (web structure) of wild orb-weaving spiders (Micrathena vigorsii), which re-build their webs daily. We related web structure to behaviours and spider body length. Web diameter and web density were repeatable among individuals, reaction to a predation threat was very marginally so, and response to a prey stimulus and web evenness were not repeatable. Larger spiders spun wider webs, had webs with increased thread spacing, and the spider possibly tended to react more slowly to a predation threat. When a spider built a relatively larger web it was also a relatively less dense and less even web. The repeatability of web construction and relationship with spider body size we found may be common features of intra-population variation in web structure in spiders. By estimating the consistency and covariances of extended phenotypes we can begin to evaluate what maintains their variation and how they might evolve.

Original languageEnglish
Pages (from-to)449-463
Number of pages15
JournalBiological Journal of the Linnean Society
Volume131
Issue number2
Early online date28 Aug 2020
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • extended phenotype
  • Micrathena
  • personality
  • syndrome
  • web structure

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