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Fluctuating Environments and Phytoplankton Community Structure: A Stochastic Model.

John M Anderies, Beatrix E Beisner

    The American Naturalist
    |February 7, 2001
    PubMed
    Summary

    Temporal fluctuations in resources impact phytoplankton communities. Stochasticity, especially demographic, enhances species coexistence, with combined effects yielding the greatest coexistence likelihood.

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    Area of Science:

    • Ecology
    • Theoretical Ecology
    • Population Dynamics

    Background:

    • Spatial heterogeneity can lead to temporal resource fluctuations for phytoplankton.
    • Temporal heterogeneity is a key factor in structuring ecological communities.

    Purpose of the Study:

    • To investigate the role of temporal heterogeneity in structuring phytoplankton communities.
    • To compare stochastic and deterministic models of resource competition.
    • To assess the impact of environmental and demographic stochasticity on species coexistence.

    Main Methods:

    • Modeling phytoplankton with contrasting life histories competing for a fluctuating resource.
    • Comparing a stochastic model (separating environmental and demographic stochasticity) with a deterministic model.
    Keywords:
    competitiondiversityphytoplanktonstochastic modeltemporal heterogeneity

    Related Experiment Videos

  • Analyzing the influence of nutrient levels and pulse frequency.

    • Main Results:

    • Stochastic models, particularly those including demographic stochasticity, predict wider parameter ranges for species coexistence compared to deterministic models.
    • Demographic stochasticity alone significantly increases coexistence possibilities more than environmental stochasticity alone.
    • The combined effects of environmental and demographic stochasticity maximize the likelihood of phytoplankton coexistence.
    • Nutrient levels and pulse frequency modulate these coexistence dynamics.

    Conclusions:

    • Temporal heterogeneity, driven by stochasticity, is a crucial factor promoting phytoplankton diversity.
    • Demographic stochasticity can mimic the 'storage effect' in variable environments, facilitating coexistence.
    • The study highlights the importance of considering both environmental and demographic stochasticity in ecological modeling.