Behavioural variability contributes to over-staying in patchy foraging

Tyler Cash-Padgett, Benjamin Hayden

Research output: Contribution to journalArticle

Abstract

Foragers often systematically deviate from rate-maximizing choices in twoways: Accuracy and precision. That is, they use suboptimal threshold values and also show variability in their application of those thresholds. We hypothesized that these biases are related and, more specifically, that foragers' widely known accuracy bias-over-staying-could be explained, at least in part, by their imprecision. To test this hypothesis, we analysed choices made by three rhesus macaques in a computerized patch foraging task.Confirming previously observed findings,we found high levels of variability.We then showed, through simulations, that this variability changed optimal thresholds, meaning that a forager aware of its own variability should increase its leaving threshold (i.e. over-stay) to increase performance. All subjects showed thresholds that were biased in the predicted direction. These results indicate that over-staying in patches may reflect, in part, an adaptation to behavioural variability.

Original languageEnglish (US)
Article number20190915
JournalBiology letters
Volume16
Issue number3
DOIs
StatePublished - Mar 1 2020

Keywords

  • Decision making
  • Foraging
  • Macaque
  • Over-staying
  • Patch-leaving

PubMed: MeSH publication types

  • Journal Article

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