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An agent-based model shows zombie ants exhibit search behavior.

Natalie Imirzian1, David P Hughes2

  • 1Department of Entomology, Pennsylvania State University, 501 ASI Building, University Park, PA 16802, USA; Center for Infectious Disease Dynamics, Pennsylvania State University, University Park, PA 16802, USA.

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Summary
This summary is machine-generated.

Zombie ant fungi (Ophiocordyceps sp.) manipulate ant behavior, causing them to bite vegetation before death. An agent-based model reveals simple movement changes, not complex manipulation, can explain this parasitic behavior.

Keywords:
Animal movementFungal pathogenIndividual-based modelParasite manipulationSocial insect

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Mycology

Background:

  • Parasites are known to alter host behavior, potentially as a byproduct or through active manipulation.
  • The 'zombie ant fungus' (Ophiocordyceps sp.) induces distinct behaviors in ants, leading to death while attached to vegetation.

Purpose of the Study:

  • To investigate the mechanisms behind parasite-induced behavioral changes in ants.
  • To model the movement patterns of fungal-infected ants before death.
  • To test hypotheses regarding directed manipulation versus natural behavioral alterations.

Main Methods:

  • Development of an agent-based model to simulate ant movement.
  • Incorporation of altered movement parameters (e.g., increased turning rate) into the model.
  • Analysis of simulated host trajectories from nest to vegetation.

Main Results:

  • The model successfully predicted infected ants moving from the nest to the underside of leaves.
  • Simulated increases in turning rate, within normal ant behavior, were sufficient to guide hosts.
  • Results suggest parasitic benefit can arise from exploiting natural host behaviors.

Conclusions:

  • Parasitic manipulation of host behavior may evolve through simple alterations rather than complex, directed control.
  • The Ophiocordyceps fungus may leverage natural ant movement patterns for its own propagation.
  • This study challenges hypotheses of highly directed parasitic manipulation in zombie ants.