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Parent-offspring conflicts over reproductive efforts: variations upon a theme by Charnov
1Department of Ecology, Theoretical Ecology, University of Lund, Sweden.
Journal of Theoretical Biology
|September 21, 1994
Summary
Parent-offspring conflict is reframed as an age-specific tradeoff, not a conflict between individuals. A gene for offspring assertiveness can evolve because its benefits when young outweigh its costs when adult.
Area of Science:
- Evolutionary biology
- Behavioral genetics
Background:
- Parent-offspring conflict is a key concept in evolutionary theory.
- Existing models often frame this as inter-individual conflict.
Purpose of the Study:
- To propose a novel formulation of parent-offspring conflict theory.
- To reframe conflict as an age-specific selection pressure and tradeoff.
Main Methods:
- Integration of traditional life-history theory with genetic arguments.
- Application of an evolutionary stable strategy (ESS) approach.
- Analysis of an "offspring-wins" scenario.
Main Results:
- Parent-offspring conflict is modeled as a tradeoff, not individual conflict.
- A gene promoting offspring assertiveness can increase in frequency when rare.
- The selective advantage of assertiveness in offspring outweighs the cost to the parent.
Conclusions:
- The proposed formulation offers a conceptual advance in understanding parent-offspring dynamics.
- Age-specific selection pressures are crucial for understanding genetic trait evolution within families.
- Assertiveness in offspring can be evolutionarily favored under specific conditions.