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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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Resident-Disperser Differences and Genetic Variability Affect Communities in Microcosms.

Allan Raffard, Julie L M Campana, Delphine Legrand

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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Population Genetics

    Background:

    • Dispersal influences ecological and evolutionary dynamics, affecting population genetics and species distribution.
    • Intraspecific phenotypic variation between residents and dispersers can mediate community structure and ecosystem productivity.
    • Scaling up resident-disperser differences to community and ecosystem levels is crucial but understudied.

    Purpose of the Study:

    • To investigate if resident-disperser phenotypic differences in *Tetrahymena thermophila* impact community biomass and composition.
    • To determine if these effects are genotype-dependent.
    • To assess the scalability of individual dispersal strategies to community-level productivity.

    Main Methods:

    • Utilized the ciliate *Tetrahymena thermophila* as a model organism.
    • Established competitive communities with four other *Tetrahymena* species.
    • Compared community biomass and composition between resident and disperser treatments across 20 genotypes.

    Main Results:

    • Dispersers significantly reduced overall community biomass compared to residents.
    • This effect was consistent across all 20 tested *Tetrahymena thermophila* genotypes.
    • Significant genotypic variation in biomass production was observed, highlighting intraspecific variability's role.

    Conclusions:

    • Individual dispersal strategy predictably scales up to affect community productivity.
    • Resident-disperser phenotypic differences are a key factor in community and ecosystem functioning.
    • Intraspecific variability has measurable consequences for ecosystem processes.