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Adaptive peak shifts in a heterogenous environment
1School of Mathematical Science, Tel Aviv University, Tel Aviv, Israel. lilach@charles.stanford.edu
Theoretical Population Biology
|December 5, 2002
Summary
Proximity of populations with differing selection intensities can accelerate the evolution of beneficial gene combinations. Limited migration between these areas significantly reduces the time needed for advantageous gene complexes to spread.
Area of Science:
- Evolutionary biology
- Population genetics
Background:
- Evolutionary adaptation involves gene complex formation and spread.
- Selection intensity impacts these two stages differently, creating a trade-off.
Purpose of the Study:
- To investigate if differing selection intensities in adjacent populations can speed up adaptive evolution.
- To model the dynamics of advantageous gene complex emergence and fixation.
Main Methods:
- A haploid two-locus diallelic model was used.
- Two neighboring subpopulations with varying selection intensities were simulated.
- The effect of limited migration was analyzed.
Main Results:
- Limited migration between areas with different selection intensities drastically reduced waiting times for beneficial combinations.
- This effect was more pronounced than complete isolation or mixing.
- Optimal conditions for gene complex appearance and spread can be achieved through spatial heterogeneity.
Conclusions:
- Spatial variation in selection intensity, coupled with limited migration, can accelerate adaptive evolution.
- This mechanism may be crucial for peripheral evolution and speciation processes.
- The findings highlight the importance of landscape structure in evolutionary trajectories.