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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Compost spatial heterogeneity promotes evolutionary diversification of a bacterium.

Stineke van Houte1, Daniel Padfield1, Pedro Gómez1

  • 1ESI and CEC, Biosciences, University of Exeter, Penryn, UK.

Journal of Evolutionary Biology
|October 28, 2020
PubMed
Summary

Altering spatial resource heterogeneity in potting compost influenced bacterial evolution. Resource specialists evolved in unmanipulated compost, while generalists dominated mixed compost, supporting diversifying selection theory.

Keywords:
Pseudomonas fluorescensadaptive radiationsoilspatial heterogeneity

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Area of Science:

  • Evolutionary biology
  • Microbial ecology
  • Environmental science

Background:

  • Spatial resource heterogeneity is theorized to drive evolutionary diversification.
  • Empirical evidence is largely limited to simplified laboratory settings.

Purpose of the Study:

  • To investigate the impact of altered spatial heterogeneity on the evolutionary diversification of *Pseudomonas fluorescens* in a semi-natural environment.
  • To test the hypothesis that resource heterogeneity drives diversifying selection.

Main Methods:

  • Manipulated spatial heterogeneity of potting compost by adding water and mixing.
  • Studied evolutionary diversification of *Pseudomonas fluorescens*.
  • Analyzed genomic data and conducted competition experiments.

Main Results:

  • Unmanipulated compost favored the evolution of resource specialists.
  • Compost-water mix promoted the evolution of generalist phenotypes.
  • Genomic and competition data supported diversifying selection due to resource heterogeneity.

Conclusions:

  • Findings corroborate theoretical and in vitro studies in more realistic, semi-natural conditions.
  • Spatial resource heterogeneity acts as a significant driver of bacterial evolutionary diversification.