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How phenotypic convergence arises in experimental evolution.

Pedro Simões1, Inês Fragata1, Josiane Santos1

  • 1cE3c-Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal.

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Summary
This summary is machine-generated.

This study tracked Drosophila populations adapting to a new environment over 60 generations. While populations showed convergence, some differences persisted, suggesting longer-term studies are crucial for understanding evolutionary convergence.

Keywords:
AdaptationDrosophila subobscuraconvergent evolutionexperimental evolutionlife-history traitslong-term evolution

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Area of Science:

  • Evolutionary biology
  • Adaptive evolution
  • Population genetics

Background:

  • Evolutionary convergence is a key, debated topic in adaptive evolution.
  • Few studies utilize real-time evolutionary trajectory approaches.
  • Initial population differences and varying evolutionary rates were observed in short-term adaptation.

Purpose of the Study:

  • To analyze changes in evolutionary dynamics over longer time spans (60 generations).
  • To determine if evolutionary convergence occurs after extended adaptation in a common environment.
  • To investigate the role of transient divergence in long-term evolutionary trajectories.

Main Methods:

  • Laboratory adaptation experiment with Drosophila subobscura populations.
  • Tracking evolutionary trajectories over short-term (20 generations) and longer-term (60 generations).
  • Comparative analysis of population differentiation and trait evolution.

Main Results:

  • Substantial variation in long-term evolutionary trajectories was observed.
  • Differences in evolutionary dynamics were noted between short- and longer-term periods.
  • Pervasive convergence towards established population values occurred, but differentiation persisted for some traits.
  • Transient divergence was observed in some cases, suggesting potential for eventual convergence.

Conclusions:

  • Longer-term studies are essential for a comprehensive understanding of evolutionary convergence.
  • Initial population differences can influence short- and long-term evolutionary dynamics.
  • While convergence is a common pattern, complete uniformity may not be reached within 60 generations, highlighting the complexity of adaptive evolution.