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Keystone Individuals Alter Ecological and Evolutionary Consumer-Resource Dynamics.

Denon Start

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    PubMed
    Summary

    Single individuals with extreme phenotypes can act as keystone individuals, significantly impacting population mortality, consumer community structure, and evolutionary selection pressures in ecological systems.

    Keywords:
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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Behavioral Ecology

    Background:

    • Intraspecific variation is crucial for evolution and ecology, typically focusing on mean trait values or variance.
    • The keystone individual concept highlights extreme phenotypes' disproportionate effects on group dynamics.

    Purpose of the Study:

    • To generalize the keystone individual concept beyond behavioral traits to broader ecological and evolutionary dynamics.
    • To test the effects of extreme phenotype individuals on a gall-forming fly and its natural enemies.

    Main Methods:

    • Introduced a predator-attracting gall-maker individual with an extreme phenotype.
    • Hypothesized impacts on population mortality, consumer community composition, and selection patterns.
    • Analyzed ecological and evolutionary consequences in a natural system.

    Main Results:

    • Found support for ecological consequences: increased mortality and altered consumer communities.
    • Observed evolutionary consequences: increased selection for defense and weakened stabilizing selection.
    • Demonstrated that single individuals with extreme phenotypes can function as keystone individuals.

    Conclusions:

    • The keystone individual concept can be extended to non-behavioral traits and broader ecological/evolutionary contexts.
    • Individuals with extreme phenotypes can exert keystone effects, influencing population and community trajectories.
    • This generalized concept has significant implications for understanding ecological and evolutionary processes.