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Related Experiment Videos

Explaining stasis: microevolutionary studies in natural populations.

J Merilä1, B C Sheldon, L E Kruuk

  • 1Department of Population Biology, Evolutionary Biology Centre, Uppsala University, Sweden. juha.merila@helsinki.fi

Genetica
|February 13, 2002
PubMed
Summary

Microevolution, or changes in population genetics, is common but rarely observed directly. New methods using animal breeding science help explain why some populations show apparent stasis despite strong selection.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Quantitative Genetics

Background:

  • Microevolutionary changes are widespread but direct observations in natural populations are rare.
  • Genetic divergence often exceeds expectations from genetic drift alone, suggesting local adaptation.
  • Experimental studies confirm rapid evolutionary responses are possible in the wild.

Purpose of the Study:

  • To investigate why heritable traits under strong directional selection often fail to show expected evolutionary responses.
  • To explore explanations for apparent evolutionary stasis in natural populations.
  • To introduce novel empirical methods for testing these explanations.

Main Methods:

  • Utilized methods adapted from animal breeding science for empirical testing.

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  • Applied these methods to long-term studies of collared flycatchers (Ficedula albicollis) and red deer (Cervus elaphus).
  • Focused on testing hypotheses for the lack of observable microevolutionary change.

    • Main Results:

    • Demonstrated the applicability of new methods for studying microevolutionary processes.
    • Provided insights into the reasons behind the apparent stasis in studied natural populations.
    • Highlighted the challenge of observing and measuring microevolutionary change in real-time.

    Conclusions:

    • Understanding the causes of evolutionary stasis is a critical challenge in modern evolutionary biology.
    • New quantitative genetic approaches can illuminate the dynamics of microevolution in natural populations.
    • Long-term studies combined with advanced methods are crucial for resolving these evolutionary puzzles.