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Related Experiment Video

Updated: May 7, 2026

Collection and Long-Term Maintenance of Leaf-Cutting Ants (Atta) in Laboratory Conditions
10:11

Collection and Long-Term Maintenance of Leaf-Cutting Ants (Atta) in Laboratory Conditions

Published on: August 30, 2022

Harvester ants use interactions to regulate forager activation and availability.

Noa Pinter-Wollman1, Ashwin Bala, Andrew Merrell

  • 1Department of Biology, Stanford University, Stanford, CA, U.S.A. ; Department of Statistics, Stanford University, Stanford, CA, U.S.A.

Animal Behaviour
|September 14, 2013
PubMed
Summary

Harvester ant colonies balance foraging flexibility and robustness by adjusting ant behavior on different timescales. This ensures efficient responses to food availability and predation risks.

Keywords:
Pogonomyrmex barbatuscollective behaviourcomplex systemflexibilityforaginginteraction rateregulationrobustnesstemporal dynamicstimescale

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Published on: December 12, 2012

Area of Science:

  • Behavioral Ecology
  • Animal Behavior
  • Social Insects

Background:

  • Social groups require mechanisms to balance flexibility and robustness when responding to environmental changes.
  • Feedback between behavioral processes operating at different timescales is crucial for collective responses.

Purpose of the Study:

  • To investigate how behavioral processes at two timescales regulate foraging activity in harvester ant colonies (Pogonomyrmex barbatus).
  • To understand how interactions within the nest link the rates of returning and outgoing foragers.

Main Methods:

  • Observation of outgoing foragers inside field colonies of Pogonomyrmex barbatus using a novel method.
  • Analysis of interaction rates and spatial clustering of outgoing foragers.
  • Measurement of forager activation and availability timescales.

Main Results:

  • Interaction rates experienced by outgoing foragers correlated with forager return rates.
  • Forager activation occurred on the timescale of seconds following increased interactions with returning foragers.
  • Forager availability adjusted on the timescale of minutes, with foragers retreating deeper into the nest when return rates were low.

Conclusions:

  • Forager activation and availability are regulated by forager return rates, with negative feedback ensuring stability.
  • Rapid activation (seconds) provides flexibility for fluctuating food abundance.
  • Slower availability adjustments (minutes) offer robustness against sustained disturbances like predation.