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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Highly Replicated Evolution of Parapatric Ecotypes.

Maddie E James1, Henry Arenas-Castro1, Jeffrey S Groh1

  • 1School of Biological Sciences, The University of Queensland,St. Lucia, QLD, Australia.

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|July 13, 2021
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Summary
This summary is machine-generated.

Selection repeatedly drives similar traits in the Australian wildflower Senecio lautus, indicating parallel evolution of ecotypes. Despite gene flow, distinct ecotypes evolved independently, challenging previous assumptions about population genetics.

Keywords:
demographic historygene flowmultiple originsnatural selectionparallel evolution

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Plant sciences

Background:

  • Parallel evolution involves independent selection for similar traits in similar environments.
  • Phylogenetic clustering by geography can infer ecotype origins but is complicated by gene flow and lineage sorting.
  • Distinguishing true parallel evolution from other evolutionary processes is crucial for understanding adaptation.

Purpose of the Study:

  • To investigate the multiple origins of ecotypes in the Australian wildflower Senecio lautus.
  • To assess the role of gene flow in shaping genetic structure and inferring ecotype evolution.
  • To determine if selection can repeatedly favor similar phenotypes despite homogenizing gene flow.

Main Methods:

  • Phylogenetic analysis of Senecio lautus populations.
  • Genetic structure analysis to quantify gene flow between ecotypes.
  • Analytical confirmation of phylogenetic distortion under varying migration rates.

Main Results:

  • Strong genetic structure and geographic clustering were observed in Senecio lautus.
  • Gene flow between parapatric ecotypes was surprisingly low.
  • Phylogenetic signals were unlikely to be distorted by gene flow at observed migration levels.

Conclusions:

  • Selection can repeatedly generate similar ecotypes in Senecio lautus.
  • Parallel evolution of ecotypes can occur even with limited gene flow.
  • The study highlights the power of selection in driving adaptive radiation and ecotype formation.