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Modelling size structured food webs using a modified niche model with two predator traits.

Jan Klecka1

  • 1Departmemt of Fish Ecology and Evolution, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum, Switzerland; Laboratory of Theoretical Ecology, Institute of Entomology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic; Department of Ecosystems Biology, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic.

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Summary

The niche model, used to study food webs, often fails to capture realistic body size structures. A new modified model better represents these size structures by incorporating species traits.

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Food Web Dynamics

Background:

  • Food webs are often modeled using stochastic models like the niche model.
  • The niche model successfully replicates many food web statistics but has not been rigorously compared for size structure.
  • Real food webs exhibit distinct size structures that are not fully captured by existing models.

Purpose of the Study:

  • To rigorously compare the size structure of food webs generated by the niche model with real food webs.
  • To develop an improved niche model that accurately represents the body mass allometry and predator-prey body mass ratios observed in nature.
  • To provide a tool for simulating the impact of size structure on food web dynamics and stability.

Main Methods:

  • A body mass-based version of the niche model was employed.
  • Prey-predator body mass allometry and predator-prey body mass ratios from the model were compared to empirical data.
  • A modified niche model was introduced with controllable size-dependence of predator-prey links, incorporating allometric relationships and species traits like foraging mode.

Main Results:

  • The standard niche model predicts weaker size structure compared to many real food webs.
  • The modified niche model successfully represents the size structure of real food webs.
  • The enhanced model allows for controlled generation of artificial food webs with varying size structures.

Conclusions:

  • Explicitly including species traits in food web models is crucial for realistic simulations.
  • The modified niche model offers new possibilities for studying the consequences of size structure on food web dynamics and stability.
  • This research highlights the importance of body size in understanding ecological interactions and food web architecture.