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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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When sinks become sources: Adaptive colonization in asexuals.

F Lavigne1,2,3, G Martin3, Y Anciaux3,4

  • 1BioSP, INRA, 84914, Avignon, France.

Evolution; International Journal of Organic Evolution
|October 12, 2019
PubMed
Summary

Population establishment in new habitats, like invasions or resistance, was modeled. Establishment success depends on mutation rate, not immigration, with a U-shaped curve, but high mutation can prevent it.

Keywords:
EpistasisFisher's geometrical modelestablishment timeevolutionary rescuelethal mutagenesis

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Area of Science:

  • Evolutionary biology
  • Population dynamics
  • Ecological genetics

Background:

  • Population establishment in new habitats mirrors evolutionary rescue with immigration.
  • This process is crucial for understanding biological invasions, host shifts, and resistance evolution.

Purpose of the Study:

  • To develop a mathematical framework for asexual population dynamics in source-sink systems.
  • To analyze factors influencing establishment success and timing in a new habitat.
  • To explore the impact of different management strategies.

Main Methods:

  • Utilized an analytically tractable model for evolutionary and demographic dynamics.
  • Employed Fisher's geometrical model in n dimensions to represent phenotype-fitness landscapes.
  • Simulated scenarios with differing phenotypic optima between source and sink habitats.

Main Results:

  • Established populations in new habitats exhibit a four-phase mean fitness trajectory.
  • Establishment time is independent of immigration rate.
  • Waiting time shows a U-shaped dependence on mutation rate, with high rates impeding establishment.

Conclusions:

  • Mutation rate is a critical factor for population establishment, more so than immigration.
  • High mutation rates can lead to lethal mutagenesis, preventing successful colonization.
  • Findings offer insights for managing biological invasions and resistance evolution.