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Begging and bleating: the evolution of parent-offspring signalling
1NERC Centre for Population Biology, Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, UK. c.godfray@ic.ac.uk
Summary
Offspring signal to parents during conflict. Costly begging signals are debated, with sibling competition offering an alternative explanation to honest handicap models.
Area of Science:
- Evolutionary ecology
- Behavioral ecology
- Game theory
Background:
- Parent-offspring conflict is a key driver of evolutionary dynamics.
- Offspring solicitation, such as begging, represents a signaling system within families.
- Theoretical frameworks for understanding signaling under conflict are actively developing.
Purpose of the Study:
- To explore theoretical challenges in the evolution of biological signaling.
- To analyze parent-offspring signaling dynamics, particularly concerning costly offspring solicitation.
- To review controversies and alternative explanations for begging signals.
Main Methods:
- Theoretical modeling of signaling equilibria.
- Review of existing literature on honest handicap signaling and begging costs.
- Exploration of sibling competition models in family signaling.
Main Results:
- The honest handicap model for begging is challenged by signaling costs.
- Pooling vs. separating signaling equilibria present distinct theoretical outcomes.
- Sibling competition provides an alternative framework for understanding costly begging.
Conclusions:
- Understanding signaling evolution requires accounting for conflicts of interest.
- Theoretical models need to incorporate factors like sibling competition and signal dynamics.
- Experimental testing is crucial for validating signaling theories in family contexts.