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Updated: Mar 1, 2026
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Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
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THE EVOLUTION OF COSTLY MATE PREFERENCES II. THE "HANDICAP" PRINCIPLE
Yoh Iwasa1, Andrew Pomiankowski2, Sean Nee3
1Department of Biology, Faculty of Science, Kyushu University, Fukuoka 812, JAPAN.
Summary
Costly female mate choice evolves under the handicap principle when mutation pressure is biased and male traits directly impact viability. These factors explain previous model successes and failures.
Area of Science:
- Evolutionary biology
- Quantitative genetics
- Behavioral ecology
Background:
- The handicap principle explains costly female mate choice, where females prefer males with exaggerated traits that reduce male survival.
- Previous models have had mixed success in explaining the evolution of such costly preferences.
Purpose of the Study:
- To investigate the evolution of costly female mate choice using a quantitative genetic model.
- To identify the necessary conditions for the evolution of female preference under the handicap principle.
Main Methods:
- Utilized a general additive quantitative genetic model.
- Analyzed the conditions required for the evolution of costly mate choice.
Main Results:
- Identified two key conditions: biased mutation pressure on viability and a direct relationship between male trait expression and viability.
- Demonstrated how these conditions explain discrepancies in prior handicap principle models.
- Showed applicability to other fitness variation sources like migration and host-parasite coevolution.
Conclusions:
- Biased mutation and trait-viability linkage are crucial for costly female mate choice evolution via the handicap principle.
- The model provides a unified framework applicable to diverse evolutionary scenarios affecting fitness.
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