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Related Experiment Video

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Non-deterministic modelling of food-web dynamics.

Benjamin Planque1, Ulf Lindstrøm1, Sam Subbey2

  • 1Institute of Marine Research, Tromsø, Norway.

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|October 10, 2014
PubMed
Summary

This study replicates a 2009 food-web model, finding that ecosystem variability arises from structural constraints. The research supports using these non-deterministic network dynamics models as null models for food webs.

Area of Science:

  • Ecology
  • Theoretical Ecology
  • Ecosystem Dynamics

Background:

  • A 2009 model by Mullon et al. proposed food-web dynamics arise from chance and necessity (system constraints).
  • This model suggested ecosystem variability stems from inherent structural constraints.
  • The original work received limited attention despite its significant conclusions.

Purpose of the Study:

  • To replicate the Mullon et al. (2009) food-web model.
  • To evaluate the conclusions drawn from the original model's simulations.
  • To promote the use of non-deterministic network dynamics models as null models for food webs.

Main Methods:

  • Revisiting the original model's equations and input parameters.
  • Implementing a comparable simulation model based on the original structure.

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  • Detailed account of model principles, structure, equations, and parameters.

    • Main Results:

    • The replicated model successfully reproduced several ecosystem dynamic patterns.
    • Patterns included pseudo-cycles, variation and volatility, diet, stock-recruitment relationships, and biomass correlations.
    • The original conclusions were largely supported by the replication.

    Conclusions:

    • Ecosystem variability can be explained by fundamental structural constraints.
    • The approach of using non-deterministic network dynamics as null models is validated.
    • Further research is needed on model parameterization and computational challenges.