Testing predictions of foraging theory for a sit-and-wait forager, Anolis gingivinus

Sharoni Shafir*, Jonathan Roughgarden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Research in foraging theory has been dominated by studies of active foragers choosing among patches and among prey within a patch. Studies of central-place foraging have mainly focused on loading decisions of an animal provisioning a central place. The problem faced by a sit-and-wait forager that encounters prey at a distance has received little attention. In this study we tested foraging theory predictions for such foragers, Anolis gingivinus females in the West Indies island of Anguilla. We presented lizards with antlion larvae at various distances. Experiment 1 showed that an individual's probability of pursuing prey decreases with the prey's distance and is best described by a sigmoidal function (which may be as steep as a step function). This function's inflection point defines a cutoff distance. Experiment 3 tested how cutoff distance changes as a function of prey size. Cutoff distances were greater for larger prey, as predicted for an energy-maximizing forager. Experiments 2 and 4 tested how cutoff distance changes as a function of prey abundance. As predicted, cutoff distances were greater at a site where prey abundance was lower. Furthermore, cutoff distances decreased immediately following prey augmentation and returned to previous values within one day of ending augmentation. Thus, anoles' foraging behavior is a dynamic process, consistent with the qualitative predictions of foraging theory. We attribute the success of this study in supporting fundamental foraging theory predictions to the lizards exhibiting natural behavior under field conditions and to particular advantages of studying sit-and-wait foragers.

Original languageAmerican English
Pages (from-to)74-84
Number of pages11
JournalBehavioral Ecology
Volume9
Issue number1
DOIs
StatePublished - 1998
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by Interval Research Corporation of Palo Alto, California. We thank Marc Mangel, Colin Clark, and an anonymous reviewer for valuable comments.

Keywords

  • Anguilla
  • Anolis gingivinus
  • Cutoff distance
  • Encounter at a distance
  • Foraging theory
  • Lizards
  • Partial preferences
  • Prey abundance
  • Prey size
  • Sit-and-wait foragers
  • Threshold
  • Zero-one rule

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