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Related Experiment Video

Updated: May 27, 2026

A Visual Guide for Studying Behavioral Defenses to Pathogen Attacks in Leaf-Cutting Ants
08:10

A Visual Guide for Studying Behavioral Defenses to Pathogen Attacks in Leaf-Cutting Ants

Published on: October 12, 2018

Sick ants become unsociable.

N Bos1, T Lefèvre, A B Jensen

  • 1Centre for Social Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark. nbos@bio.ku.dk

Journal of Evolutionary Biology
|November 30, 2011
PubMed
Summary
This summary is machine-generated.

Infected ants exhibit behavioral changes to protect their colony from disease. They reduce social interactions and isolate themselves, demonstrating evolved unsociability to mitigate parasite spread.

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Area of Science:

  • Behavioral Ecology
  • Social Insect Pathology
  • Evolutionary Biology

Background:

  • Social insects face significant threats from parasites due to their colonial living.
  • Host traits that minimize infection risk are strongly favored by natural selection.
  • Understanding behavioral adaptations to disease is crucial for social insect survival.

Purpose of the Study:

  • To investigate behavioral changes in infected carpenter ants (Camponotus aethiops) to prevent colony infection.
  • To determine if infected ants alter their social interactions, brood care, and nest behavior.
  • To examine changes in aggression and cuticular chemical profiles of infected ants.

Main Methods:

  • Observation of infected and uninfected carpenter ants (Camponotus aethiops) over time.
  • Quantification of social interactions, brood interactions, and time spent inside/outside the nest.
  • Assessment of aggression towards non-nestmates and analysis of cuticular chemical profiles.

Main Results:

  • Infected ants significantly reduced social interactions and ceased interacting with brood.
  • Infected individuals spent increasing time outside the nest from day 3 until death.
  • Aggressiveness towards non-nestmates increased, while cuticular chemical profiles remained unchanged.

Conclusions:

  • Pathogen infection drives a radical shift towards unsociability in infected ants.
  • Behavioral changes in infected ants serve to reduce the risk of disease transmission within the colony.
  • Inclusive fitness likely plays a role in the evolution of these protective behaviors.