Diploid models of the handicap principle

Area of Science:

• Evolutionary Biology
• Behavioral Ecology
• Genetics

Background:

• Sexual selection models explain the evolution of male traits favored by female choice.
• Fisherian models propose initial advantages for male traits, while handicap principles suggest females prefer disadvantaged males indicating underlying fitness.

Purpose of the Study:

• To compare the efficacy of Fisherian models versus handicap principles in explaining the evolution of male sexual ornaments.
• To investigate the role of condition-dependent handicaps in sexual selection.

Main Methods:

• Review and analysis of existing theoretical models of sexual selection.
• Exploration of haploid and diploid models for condition-dependent handicaps.
• Modeling of handicaps interacting with the Fisherian process.

Main Results:

• Handicap principle models are generally unlikely to explain sexual ornament evolution independently.
• Condition-dependent handicaps were not supported by diploid models, despite some success in haploid models.
• Fisherian models are more probable drivers of male sexual ornament evolution.

Conclusions:

• Fisherian models provide a more robust framework for understanding the evolution of male sexual ornaments.
• Handicap mechanisms may act as a supplementary force, enhancing the Fisherian process rather than acting alone.