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Related Experiment Videos

Divergent evolution during an experimental adaptive radiation.

R Craig MacLean1, Graham Bell

  • 1Department of Biology, McGill University, 1205 Drive Penfield, Montreal, Quebec H3A 1B1, Canada. rmacle2@po-box.mcgill.ca

Proceedings. Biological Sciences
|August 12, 2003
PubMed
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Evolutionary adaptation can be repeatable, but the specific genetic mutations driving it can vary. This study shows that while Pseudomonas fluorescens evolved similar traits in new environments, the underlying beneficial mutations differed across experimental lines.

Area of Science:

  • Evolutionary biology
  • Microbial genetics
  • Adaptive radiation

Background:

  • Comparative studies suggest evolutionary outcomes are reproducible.
  • Experimental evolution provides a platform to test reproducibility.
  • Understanding the genetic basis of adaptation is key.

Purpose of the Study:

  • To test the reproducibility of adaptive evolution.
  • To infer the genetic basis of adaptation in Pseudomonas fluorescens.
  • To compare phenotypic and genetic convergence during adaptive radiation.

Main Methods:

  • Experimental evolution of Pseudomonas fluorescens in novel environments.
  • Adaptation to 23 different carbon-limited environments for 1100 generations.
  • Mutation accumulation lines evolved by drift for 2000 generations.

Related Experiment Videos

  • Phenotypic assays using Biolog microplates to assess adaptation.

    • Main Results:

    • Replicate selection lines evolved similar adaptive phenotypic traits.
    • Significant variation observed in non-adaptive phenotypic traits.
    • Different beneficial mutations arose independently in replicate lines.
    • Phenotypic convergence can mask underlying genetic divergence.

    Conclusions:

    • Adaptive evolution exhibits both convergence and divergence at the genetic level.
    • Phenotypic similarity does not necessitate identical genetic mechanisms.
    • Reconciles comparative and experimental findings on evolutionary reproducibility.