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Cost, competition and information in communication between relatives.
Ben O Brilot1, Rufus A Johnstone
1Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK. bob21@cam.ac.uk
Journal of Theoretical Biology
|September 25, 2002
Summary
Honest, cost-free communication between relatives can be stable but uninformative. Increasing competitor numbers in non-costly signalling models boosts broadcast information, highlighting a trade-off between signal cost and information content.
Area of Science:
- Evolutionary biology
- Animal communication
- Game theory
Background:
- Recent models suggest stable, cost-free communication between relatives is possible.
- Cost-free signalling can be more efficient than costly signalling.
Purpose of the Study:
- To investigate the information content of cost-free signals.
- To explore the trade-off between signal cost and information in kin communication.
- To examine the impact of competition on signalling behaviour.
Main Methods:
- Theoretical modeling of communication dynamics.
- Analysis of signalling equilibria under varying relatedness and competition.
- Exploration of information transfer in non-costly signalling systems.
Main Results:
- Cost-free signals are less informative, especially at low relatedness.
- Competition among signallers reduces individual display propensity.
- Increased competitor numbers enhance information in non-costly signals.
Conclusions:
- A trade-off exists between signal cost and information content.
- Competition can paradoxically increase overall information in kin communication systems.
- Non-costly signals are viable but have limitations in conveying detailed information.