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Heritable variation and evolution under favourable and unfavourable conditions.

Hoffmann, Merilä

    Trends in Ecology & Evolution
    |May 14, 1999
    PubMed
    Summary

    Environmental conditions influence genetic variation in traits, impacting adaptation effectiveness. Unfavorable conditions may increase genetic variation, but research trends vary across studies and traits.

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    Area of Science:

    • Evolutionary biology
    • Quantitative genetics
    • Ecology

    Background:

    • Genetic variability in traits is influenced by environmental conditions.
    • Environmental factors can affect the efficacy of natural selection and adaptation.
    • Hypotheses exist regarding the relationship between environmental stress and genetic variation expression.

    Purpose of the Study:

    • To explore how environmental conditions affect genetic variability in quantitative traits.
    • To investigate the implications of environmental influence on adaptation.
    • To synthesize current understanding of selection's impact on genetic variation.

    Main Methods:

    • Review of existing hypotheses on genetic variation and environmental conditions.
    • Analysis of trends from recent studies in model organisms (Drosophila) and birds.
    • Focus on morphological traits and their response to specific environmental contexts.

    Main Results:

    • Genetic variability can change directly in response to environmental conditions.
    • Selection effectiveness for adaptation may differ across environments.
    • Recent studies indicate potential trends for morphological traits under certain conditions, though a universal consensus is lacking.

    Conclusions:

    • Environmental context is crucial for understanding genetic variation dynamics.
    • The relationship between environmental conditions and genetic variation is complex and debated.
    • Further research is needed to reconcile differing predictions and observations across taxa and traits.

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