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Trophic dynamics of a simple model ecosystem.

Graham Bell1, Étienne Fortier-Dubois2

  • 1Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montreal, Quebec, Canada H3A 1B1 graham.bell@mcgill.ca.

Proceedings. Biological Sciences
|September 15, 2017
PubMed
Summary
This summary is machine-generated.

Ecological models reveal that resource and immigrant supply shapes community complexity. Low input creates simple food webs, while ample resources and immigrants foster complex, trophically equivalent species communities.

Keywords:
community ecologyecological stabilityfood webmutual replenishmentneutral theorytrophic level

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Mathematical Biology

Background:

  • Understanding ecological community dynamics is crucial for predicting ecosystem behavior.
  • Food web structure significantly influences ecosystem properties like stability and productivity.
  • Previous models often lacked the capacity to explore the full spectrum of food web possibilities.

Purpose of the Study:

  • To develop a comprehensive model of ecological community dynamics.
  • To investigate the influence of resource supply and immigration on food web structure and succession.
  • To introduce and define the principle of mutual replenishment in community assembly.

Main Methods:

  • Construction of a simplified model for enumerating possible food webs.
  • Utilizing transition matrices to predict community succession outcomes.
  • Analyzing the impact of resource availability and immigration rates on transition probabilities.

Main Results:

  • Low resource and immigration input leads to simple community structures.
  • Adequate resource and immigrant supply promotes the development of trophically complex communities.
  • The principle of mutual replenishment explains the emergence of trophically equivalent species in neutral couples under local dispersal.
  • A dynamic core of webs forming a neutral interchange network is predicted under external immigration.

Conclusions:

  • Food web structure is not generally predictable from whole-community properties.
  • Community dynamics and food web complexity are significantly shaped by resource and immigration regimes.
  • The principle of mutual replenishment offers a novel framework for understanding trophic dynamics in complex communities.
  • Ecological succession can lead to predictable patterns of species equivalence within food webs.