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The evolution of trophic structure.

G Bell1

  • 1Redpath Museum and Biology Department, McGill University, Montreal, Quebec, Canada. graham.bell@mcgill.ca

Heredity
|August 10, 2007
PubMed
Summary
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This study simulated ecosystems to show that simple individual rules create complex food webs. Stable ecosystems can persist if predator-prey interactions are strong, even with continuous species turnover.

Area of Science:

  • Ecological modeling
  • Theoretical ecology
  • Ecosystem dynamics

Background:

  • Understanding complex ecological communities and food web dynamics is crucial for predicting ecosystem stability and function.
  • Previous models often focused on static food web structures or lacked detailed individual-based interactions.

Purpose of the Study:

  • To investigate how simple individual-level rules generate macroscopic ecosystem properties and food web structures.
  • To determine the conditions under which simulated ecological communities persist and evolve.
  • To explore the relationship between species richness, speciation, and community stability.

Main Methods:

  • Development of a simulated ecosystem with digital individuals interacting based on simple rules of consumption and reproduction.

Related Experiment Videos

  • Analysis of trophic relationships, food web topology, and system-level attributes like productivity.
  • Examination of community persistence and species turnover under varying species pool sizes and speciation rates.

    • Main Results:

    • Complex food webs and persistent ecosystems emerge from simple individual-based rules, provided predator-prey interactions are sufficiently strong.
    • Macroscopic ecosystem properties, such as food web topology and productivity, are direct consequences of microscopic individual attributes.
    • Evolutionarily stable food webs are limited to small species pools; larger pools or speciation lead to continuous species turnover while maintaining overall community properties.
    • Coexistence of ecologically distinct food webs is facilitated by negative frequency-dependent selection.

    Conclusions:

    • Ecosystem properties arise from individual interactions, not novel system-level processes.
    • Species-rich communities exhibit dynamic food webs with constant species turnover, driven by reciprocal selection between species and the food web structure.
    • Selection does not necessarily optimize community stability or productivity.