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Related Experiment Videos

How strong is natural selection?

J K. Conner

    Trends in Ecology & Evolution
    |April 13, 2001
    PubMed
    Summary
    This summary is machine-generated.

    Quantitative measurements show that natural selection

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    Area of Science:

    • Evolutionary biology
    • Ecology

    Background:

    • The strength of natural selection is a long-standing debate in evolutionary biology.
    • Quantitative measurements of phenotypic selection were historically scarce, hindering empirical assessment.

    Purpose of the Study:

    • To quantify the strength of phenotypic selection across various natural populations.
    • To provide a benchmark for the magnitude of selection pressures in nature.

    Main Methods:

    • A meta-analysis was conducted, synthesizing data from 63 independent studies.
    • Standardized directional selection gradients were calculated as a measure of selection strength.

    Main Results:

    • The median standardized directional selection gradient across studies was 0.16.
    • This value represents a quantitative estimate of the strength of phenotypic selection in nature.

    Conclusions:

    • The findings provide empirical evidence for the magnitude of selection in natural settings.
    • Interpreting the strength of selection (strong vs. weak) is context-dependent and influenced by estimation errors.