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Evolutionary Rescue Through Partly Heritable Phenotypic Variability.

Oana Carja1, Joshua B Plotkin2

  • 1School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213 ocarja@andrew.cmu.edu.

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|January 31, 2019
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Summary
This summary is machine-generated.

Phenotypic variability can help populations survive environmental changes. Some heritability aids survival, but too much hinders it, impacting evolutionary rescue and long-term persistence.

Keywords:
adaptation to environmental changebacterial persistenceevolutionary bet-hedgingevolutionary rescuefluctuating environmentsstochastic switchingtime to extinction

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Theoretical ecology

Background:

  • Environmental changes pose extinction risks to populations.
  • Evolutionary adaptation and phenotypic variability are key survival mechanisms.
  • Phenotypic variability, or bet-hedging, may enhance lineage survival without individual benefit.

Purpose of the Study:

  • To model the impact of partly heritable phenotypic variability on evolutionary rescue.
  • To investigate how phenotypic heritability affects population persistence in changing environments.

Main Methods:

  • Developed a population genetic model.
  • Analyzed the influence of heritability on extinction probability and persistence duration.

Main Results:

  • Population persistence shows a non-monotonic relationship with phenotypic heritability.
  • Intermediate heritability levels enhance evolutionary rescue probability.
  • Partly heritable variation extends persistence, increasing chances for beneficial mutations.

Conclusions:

  • Phenotypic variability is crucial for population persistence under environmental stress.
  • Optimal levels of heritability balance bet-hedging benefits against adaptive potential.
  • Findings have implications for therapies targeting pathogen or aberrant cell populations.