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VARIANCE-INDUCED PEAK SHIFTS.

Michael C Whitlock1

  • 1Institute of Cell, Animal and Population Biology, Ashworth Laboratory, King's Buildings, University of Edinburgh, Edinburgh, EH9 3JT, Scotland.

Evolution; International Journal of Organic Evolution
|June 1, 2017
PubMed
Summary
This summary is machine-generated.

Bottlenecks and founder events can increase phenotypic variance, enabling populations to shift adaptive states. This variance-induced peak shift accelerates evolutionary change, surpassing traditional models.

Keywords:
Adaptive landscapesphenotypic varianceshifting balance

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Bottlenecks and founder events can alter population size and genetic structure.
  • Phenotypic variance plays a crucial role in evolutionary trajectories.

Purpose of the Study:

  • To investigate how increased phenotypic variance influences adaptive peak shifts.
  • To explore the mechanisms driving rapid evolutionary change in populations.

Main Methods:

  • Theoretical modeling of population dynamics.
  • Analysis of fitness landscapes and selection pressures.

Main Results:

  • Increased phenotypic variance, particularly after population bottlenecks, can facilitate adaptive peak shifts.
  • Changes in variance can alter the fitness landscape, promoting deterministic phenotypic evolution by selection.
  • Variance-induced shifts enable rapid, punctuational evolution, exceeding rates predicted by Wright's shifting-balance process.

Conclusions:

  • Phenotypic variance is a key factor in evolutionary transitions.
  • Variance-induced peak shifts offer a mechanism for rapid adaptation and speciation.
  • Understanding these dynamics is crucial for predicting evolutionary outcomes.