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Are large complex ecosystems more unstable? A theoretical reassessment with predator switching
1Department of Geosciences, University of Arizona, Tucson 85710, USA. jon@geo.arizona.edu
Mathematical Biosciences
|February 1, 2000
Summary
Predator switching stabilizes ecosystems, contrary to classic models. This finding suggests complex ecosystems may be more stable than previously thought, aligning with real-world observations.
Area of Science:
- Ecology
- Theoretical Ecology
- Mathematical Biology
Background:
- Classic Lotka-Volterra models suggest increased ecosystem instability with higher diversity and connectance.
- These models do not account for predator behavior changes when prey abundance fluctuates.
Purpose of the Study:
- To investigate the impact of predator switching on ecosystem stability in multi-species Lotka-Volterra models.
- To reconcile theoretical predictions with empirical ecological observations.
Main Methods:
- Modification of the multi-species Lotka-Volterra model to incorporate predator switching behavior.
- Analysis of model dynamics to assess stability in relation to diversity and connectance.
Main Results:
- Ecosystem stability in the modified models is independent of diversity and connectance.
- Predator switching behavior significantly alters the stability dynamics compared to classic models.
Conclusions:
- The inclusion of predator switching suggests that complex ecosystems may be more stable than traditional models predict.
- Findings support empirical observations of stable, diverse natural ecosystems.
- Revising ecological models with realistic behavioral dynamics is crucial for accurate stability predictions.
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