Sexual Selection on Leks: A Fruit Fly Primer

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Entomology

Background:

• Lek mating systems are rare, characterized by males aggregating at arenas to display for females, who choose mates without resource control.
• Fruit flies (Tephritidae and Drosophilidae) exhibit lek behavior mirroring classic vertebrate systems.
• Understanding lek mating provides insights into sexual selection and reproductive strategies across diverse taxa.

Purpose of the Study:

• To provide a comprehensive overview of empirical research on lek-forming tephritid and drosophilid flies.
• To synthesize current knowledge on the ecological and evolutionary aspects of fruit fly leks.
• To address key questions regarding lek structure, male-male competition, and female mate choice in these insects.

Main Methods:

• Literature review and synthesis of existing empirical findings on fruit fly leks.
• Organization of information around 19 key questions addressing various facets of lek behavior.
• Focus on precopulatory mate choice, with brief mentions of sperm competition and female cryptic choice.

Main Results:

• Fruit fly leks share fundamental characteristics with vertebrate leks, including spatial aggregation and female choice.
• Factors influencing male mating success include aggression, signaling, and position within the lek.
• Evidence suggests both direct and indirect benefits for females selecting mates at leks.

Conclusions:

• Tephritid and drosophilid flies serve as valuable insect models for studying the evolution and mechanisms of lek mating systems.
• Further research can elucidate the complexities of sexual selection, including male competition and female choice, in these species.
• Comparative studies of lekking insects and vertebrates can reveal universal principles of mating system evolution.