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Desert locusts use both personal and social information to make foraging decisions. They balance conflicting evidence but reinforce consistent information for efficient collective action.

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Area of Science:

  • Animal behavior
  • Ecology
  • Neuroscience

Background:

  • Locust swarms are a significant agricultural pest, capable of widespread devastation.
  • Gregarious behavior in locusts is thought to enhance foraging, but the mechanisms of social cohesion are not fully understood.

Purpose of the Study:

  • To investigate how individual desert locusts integrate personal and social information during patch selection.
  • To model the decision-making process underlying collective foraging in locusts.

Main Methods:

  • Collected high-resolution movement trajectories of individual and grouped desert locusts in a two-patch choice assay.
  • Monitored individual experiences and estimated evidence accumulation from personal and social sources.
  • Applied a Bayesian model to analyze patch selection decisions.

Main Results:

  • Locusts balance incongruent evidence (personal vs. social information) during patch selection.
  • They reinforce congruent evidence, strengthening their collective foraging decisions.
  • Individual locusts' decisions are influenced by a leaky accumulation of both personal and social cues.

Conclusions:

  • Desert locusts dynamically weigh personal and social information to optimize foraging efficiency.
  • This study provides a framework for understanding collective decision-making in social insects.
  • Locusts serve as a valuable model for studying individual choices and emergent collective dynamics.