THE EVOLUTION OF MATE PREFERENCES FOR MULTIPLE SEXUAL ORNAMENTS

Area of Science:

• Evolutionary biology
• Animal behavior
• Sexual selection

Background:

• Males often display multiple sexual ornaments during courtship.
• Female choice is a key driver of sexual selection.
• The handicap principle suggests ornaments signal male genetic quality.

Purpose of the Study:

• To investigate the evolution of female preference for multiple male sexual ornaments under the handicap principle.
• To develop a new handicap model to analyze the conditions favoring single versus multiple preferences.

Main Methods:

• Development of a new theoretical handicap model.
• Analysis of selection pressures and costs associated with mate choice.
• Comparison with Fisher's runaway process of sexual selection.

Main Results:

• Multiple sexual preferences can evolve if the cost of assessing additional male traits is low.
• A single preference becomes evolutionarily stable if assessment costs increase substantially.
• The evolution of one preference can inhibit the evolution of others, even for superior indicator traits.

Conclusions:

• The cost of female mate choice is critical in determining the number of preferred male traits.
• Sexual selection via the handicap principle differs from Fisher's runaway process regarding the evolution of multiple preferences.
• Understanding these dynamics is crucial for explaining the diversity of courtship displays.