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Lotka-Volterra equations: Decomposition, stability, and structure

Part I: Equilibrium analysis

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Summary

The major objective of this paper is to propose a new decomposition-aggregation framework for stability analysis of Lotka-Volterra equations employing the concept of vector Liapunov functions. Both the disjoint and the overlapping decompositions are introduced to increase flexibility in constructing Liapunov functions for the overall system. Our second objective is to consider the Lotka-Volterra equations under structural perturbations, and derive conditions under which a positive equilibrium is connectively stable. Both objectives of this paper are directed towards a better understanding of the intricate interplay between stability and complexity in the context of robustness of model ecosystems represented by Lotka-Volterra equations. Only stability of equilibria in models with constant parameters is considered here. Nonequilibrium analysis of models with nonlinear time-varying parameters is the subject of a companion paper.

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Authors and Affiliations

  1. University of Santa Clara, 95053, Santa Clara, CA, USA

    M. Ikeda & D. D. Šiljak

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  1. M. Ikeda
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  2. D. D. Šiljak
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Research supported by U.S. Department of Energy under the Contract EC-77-S-03-1493.

On leave from Kobe University, Kobe, Japan.

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Ikeda, M., Šiljak, D.D. Lotka-Volterra equations: Decomposition, stability, and structure. J. Math. Biology 9, 65–83 (1980). https://doi.org/10.1007/BF00276036

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  • DOI: https://doi.org/10.1007/BF00276036

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