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Sex allocation and dispersal in a heterogeneous two-patch environment.
Geoff Wild1, James Greenwood-Lee, Peter D Taylor
1Department of Mathematics and Statistics, Queen's University, Kingston, Ontario, Canada K7L 3N6. gwild@mast.queensu.ca
Theoretical Population Biology
|December 27, 2005
Summary
This study explores how sex allocation and dispersal evolve in different habitats. It finds that sex-specific differences in habitat quality drive biased sex allocation and one-way dispersal, while small differences lead to unbiased allocation and no dispersal.
Area of Science:
- Evolutionary biology
- Behavioral ecology
- Game theory
Background:
- Sex allocation and dispersal are key evolutionary strategies.
- Habitat quality can influence offspring competitiveness in a sex-specific manner.
- Previous models often assumed complete population mixing during mating.
Purpose of the Study:
- To investigate the co-evolution of sex allocation and dispersal in a two-habitat system.
- To analyze how sex-specific differences in habitat quality impact these strategies.
- To model scenarios with incomplete population mixing.
Main Methods:
- Game theoretic analysis.
- Modeling of a two-habitat environment with differing qualities.
- Examination of fixed and co-evolving dispersal rates.
Main Results:
- Stable sex allocation can be biased or unbiased under fixed dispersal.
- When sex allocation and dispersal co-evolve, large sex-specific differences in spatial heterogeneity lead to biased sex allocation and opposing dispersal directions.
- Small sex-specific differences result in unbiased sex allocation and no dispersal.
Conclusions:
- Sex-specific competitive abilities in varying habitats are crucial drivers of sex allocation and dispersal evolution.
- The degree of sex-specific differences in spatial heterogeneity dictates whether populations evolve biased or unbiased sex allocation and directed or no dispersal.
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