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State-dependent choice and ecological rationality.

Andrew L Nevai1, Thomas A Waite, Kevin M Passino

  • 1Mathematical Biosciences Institute, Ohio State University, Columbus, OH 43210, USA.

Journal of Theoretical Biology
|May 1, 2007
PubMed
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Decision-makers flexibly adjust risk-taking based on their current state, like food availability. A state supplement can decrease risk-taking if food gains diminish, but increase it if gains are substantial.

Area of Science:

  • Behavioral Ecology
  • Decision Theory

Background:

  • Animals often face trade-offs between acquiring resources and avoiding predation.
  • State-dependent decision-making, where an individual's internal state influences choices, is crucial for survival and reproduction.

Purpose of the Study:

  • To investigate how an animal's internal state (hoarded food) affects its willingness to trade predation risk for food rewards.
  • To model the influence of state changes on risk-taking behavior using a sigmoid fitness function.

Main Methods:

  • Developed a theoretical model based on a sigmoid fitness function to predict state-dependent risk-taking.
  • Applied the model to explain empirical observations in hoarding gray jays (Perisoreus canadensis) receiving an experimental food subsidy.

Main Results:

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  • The model predicts that a state supplement can either decrease or increase risk-taking depending on whether the current state is above or below a fitness threshold.
  • Below the threshold, increased state leads to greater risk-taking; above it, increased state leads to decreased risk-taking.
  • The model successfully explains why gray jays accepted greater danger after a food subsidy, suggesting their effective hoard was diminished by theft and decomposition.

Conclusions:

  • Adaptive state-dependent choice provides a unified explanation for seemingly irrational risk-taking behaviors in animals.
  • Understanding an animal's current state is critical for predicting its behavioral responses to resource availability and perceived threats.