Understanding hermaphrodite species through game theory

Area of Science:

• Evolutionary biology
• Game theory
• Sexual selection

Background:

• Hermaphroditism presents diverse sexual strategies, including sequential and simultaneous forms.
• Understanding the proximate factors influencing the stability of these strategies is crucial in evolutionary biology.

Purpose of the Study:

• To investigate the proximate factors governing the existence and stability of different sexual strategies.
• To analyze how costs associated with sex change and sexual competition shape hermaphrodite sexual behavior.

Main Methods:

• Development and analysis of a general dynamical game model.
• The model is structured by organism size and sex to explore strategic interactions.

Main Results:

• Organism size alone is insufficient to explain role selection in hermaphrodites, even considering energetic costs of gametes.
• The stability of sequential versus simultaneous hermaphroditism is contingent upon the costs of changing sex.
• The stability of protandrous versus protogynous strategies is determined by the costs of sexual competition.

Conclusions:

• Sexual strategy evolution in hermaphrodites is shaped by a complex interplay of sex change and competition costs.
• Proximate-level analyses reveal specific cost structures that favor different sexual strategies, moving beyond size-based explanations.