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Summary
Population structure impacts sex ratios. When mating precedes dispersal, sex ratios are unaffected by dispersal rates. However, if dispersal occurs before mating, sex ratios favor the more mobile sex due to reduced sibling competition.
Area of Science:
- Evolutionary biology
- Population genetics
Background:
- Understanding sex ratio evolution is crucial in population genetics.
- Local mate competition models predict sex ratios under specific mating and dispersal scenarios.
Purpose of the Study:
- To analytically determine equilibrium sex ratios under Wright's island model.
- To investigate the effects of population structure and limited dispersal on sex ratios.
Main Methods:
- Analytical determination of equilibrium sex ratios.
- Application of Wright's island model with varying dispersal patterns.
Main Results:
- When mating occurs before dispersal, dispersal rate has minimal impact on equilibrium sex ratios.
- The equilibrium sex ratio remains consistent with models of complete dispersal.
- When dispersal precedes mating, a bias emerges favoring the sex with higher dispersal rates.
Conclusions:
- Population structure, specifically the timing of mating and dispersal, significantly influences equilibrium sex ratios.
- Limited dispersal can lead to biased sex ratios when dispersal occurs before mating, driven by reduced sibling competition.