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Related Experiment Videos

A Levy flight-random walk model for bioturbation.

Danny Reible1, Sanat Mohanty

  • 1Department of Chemical Engineering and Hazardous Substance Research Center, Louisiana State University, Baton Rouge 70803, USA. reible@che.lsu.edu

Environmental Toxicology and Chemistry
|April 16, 2002
PubMed
Summary

Benthic organisms rework sediments through bioturbation, influencing contaminant migration. Levy flight models show foraging activity is key to contaminant flux, impacting environmental cleanup strategies.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Ecology

Background:

  • Bioturbation, the disturbance of sedimentary layers by living organisms, significantly impacts contaminant transport in aquatic ecosystems.
  • Understanding bioturbation mechanisms is crucial for predicting contaminant fate and developing effective remediation strategies.
  • Previous models often simplified the complex behaviors of benthic organisms.

Purpose of the Study:

  • To develop and apply a lattice model simulating contaminant migration driven by bioturbation.
  • To investigate the influence of different bioturbation behaviors (burrowing, foraging, feeding) on contaminant redistribution.
  • To validate model predictions against experimental data from laboratory microcosms.

Main Methods:

  • Employing Levy flights within a lattice model to represent organism movement patterns.

Related Experiment Videos

  • Coupling bioturbation processes (burrowing, foraging, conveyor-belt feeding) with molecular diffusion.
  • Utilizing laboratory microcosms with pyrene-contaminated sediments and the oligochaete Limnodrilus hoffmeisteri for validation.

    • Main Results:

    • The model accurately predicts a square-root relationship between bioturbation rates and contaminant migration across various biomass densities.
    • Model predictions for sediment flux and in-bed concentration profiles align with experimental observations.
    • Simulated foraging activities were identified as the primary driver of pyrene flux to overlying waters.

    Conclusions:

    • Levy flight-based bioturbation models provide a robust framework for understanding contaminant transport in sediments.
    • Organism foraging behavior exerts a dominant control on the flux of contaminants from sediments to the water column.
    • The model's sensitivity analysis highlights the importance of specific bioturbation mechanisms in determining contaminant fate.