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Is a new evolutionary synthesis necessary?

G L Stebbins, F J Ayala

    Science (New York, N.Y.)
    |August 28, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Macroevolutionary processes like speciation are debated as gradual or punctuated. Microevolutionary principles are compatible with both, decoupling macroevolutionary patterns from microevolutionary predictions.

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    Area of Science:

    • Evolutionary biology
    • Developmental biology

    Background:

    • The synthetic theory of evolution posits gradual macroevolutionary processes.
    • Debate exists on whether macroevolution is gradual or punctuated.

    Purpose of the Study:

    • To investigate the relationship between microevolutionary phenomena and macroevolutionary patterns.
    • To determine if macroevolutionary patterns can be deduced from microevolutionary principles.

    Main Methods:

    • Theoretical analysis of evolutionary principles.
    • Examination of the compatibility of microevolution with gradualism and punctualism.

    Main Results:

    • Microevolutionary phenomena underlie macroevolutionary processes.
    • Microevolutionary principles are compatible with both gradualism and punctualism.

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  • Macroevolutionary patterns cannot be deduced from microevolutionary principles.

    • Conclusions:

    • Microevolution and macroevolution are decoupled.
    • The synthetic theory of evolution is compatible with microevolutionary principles.
    • Further research is needed to ascertain the tempo of macroevolution.