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Stability trophic cascades in food chains
David W Shanafelt1,2, Michel Loreau1
1Centre for Biodiversity Theory and Modelling, Theoretical and Experimental Ecology Station, CNRS and Paul Sabatier University, 09200 Moulis, France.
Royal Society Open Science
|December 20, 2018
Summary
This study models food chain stability, finding species stability is highest at the top trophic level. Stability patterns mirror mean biomass when trophic levels are added or removed.
Area of Science:
- Ecology
- Theoretical Ecology
- Food Web Dynamics
Background:
- Previous research focused on individual species' impact on food web stability.
- A general theory for how stability changes with trophic level alterations is lacking.
Purpose of the Study:
- To develop a general theory on food chain stability by examining the effects of adding or removing trophic levels.
- To model how species stability, measured as invariability, is affected by changes in trophic structure.
Main Methods:
- Utilized a simple linear food chain model.
- Systematically evaluated changes in species stability with the addition and removal of trophic levels.
- Identified the role of trophic cascades in influencing species stability.
Main Results:
- Species stability is highest at the top trophic level due to top-down predation and bottom-up prey regulation.
- Species stability is lowest just below the top trophic level.
- Stability patterns directly correlate with mean biomass patterns when trophic levels are manipulated.
Conclusions:
- The study provides a foundational model for understanding how trophic level changes impact food chain stability.
- Findings can guide empirical research on ecosystem stability and resilience.
- Identified trophic cascades as a key factor in the stability of species within food chains.
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