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Experimental evolution of evolutionary potential in fluctuating environments.

Tarmo Ketola1, Ilkka Kronholm1

  • 1Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland.

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|May 2, 2023
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Summary
This summary is machine-generated.

Evolutionary potential relies on genetic variation. Experiments with Serratia marcescens show that adaptation to fluctuating environments reduces the visibility of genetic variation to natural selection.

Keywords:
bet-hedgingexperimental evolutionfluctuating environmentsgenetic variation

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Microbiology

Background:

  • Genetic variation is essential for evolution.
  • Environmental fluctuations can influence the visibility of genetic variation to natural selection.
  • Experimental evidence is needed to understand these interactions.

Purpose of the Study:

  • To quantify genetic and environmental variance in Serratia marcescens populations.
  • To investigate how experimental evolution in constant versus fluctuating environments affects evolutionary potential.
  • To determine if adaptation to fluctuating environments alters the visibility of genetic variation.

Main Methods:

  • Experimental evolution of Serratia marcescens in controlled environments (constant and fluctuating).
  • Quantification of variance components (population, genotype, environment).
  • Analysis of how environmental conditions impact genetic variation visibility.

Main Results:

  • Populations evolved in fluctuating environments showed increased environmental variation.
  • Adaptation to fluctuating conditions appears to decrease the visibility of genetic variation to selection.
  • Differences in evolutionary potential were observed based on environmental history.

Conclusions:

  • Environmental fluctuations can mask genetic variation, potentially impacting evolutionary trajectories.
  • Adaptation to environmental instability may involve mechanisms that reduce the direct influence of genetic differences on fitness.
  • Further research is needed to fully elucidate the interplay between environmental dynamics and genetic variation in evolution.