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Preparing for battle? Potential intergroup conflict promotes current intragroup affiliation.
1School of Biological Sciences, University of Bristol, , Woodland Road, Bristol BS8 1UG, UK. andy.radford@bristol.ac.uk
Biology Letters
|July 9, 2010
Summary
Animal behavior in groups facing potential conflict shows increased social bonding. Cooperatively breeding green woodhoopoes (Phoeniculus purpureus) exhibit more allopreening, a social grooming behavior, when anticipating intergroup conflict.
Area of Science:
- Animal Behavior
- Evolutionary Biology
- Ornithology
Background:
- Human soldiers increase affiliative behavior in combat zones.
- Intergroup conflict's influence on intragroup affiliative behavior in non-human animals is understudied.
Purpose of the Study:
- To investigate how potential intergroup conflict affects intragroup affiliative behavior in cooperatively breeding green woodhoopoes (Phoeniculus purpureus).
Main Methods:
- Observing allopreening (social preening) and self-preening rates in green woodhoopoes.
- Correlating these behaviors with the likelihood of intergroup conflict in different areas.
Main Results:
- Allopreening significantly increased in groups entering areas with higher potential for neighbor conflicts.
- Self-preening rates, a stress indicator, did not increase, suggesting the change in allopreening is not solely stress-driven.
- The dominant breeding pair increased their preening of subordinate helpers.
Conclusions:
- Increased allopreening may represent a social contract, exchanging current affiliation for future agonistic support in intergroup conflicts.
- Findings offer insights into group dynamics, cooperation, and the evolution of sociality, hinting at social contracts and future planning in birds.
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