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Scaling in a Multispecies Network Model Ecosystem

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  • Ricard V. Solé
  • David Alonso
  • Alan McKane
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    Abstract

    A new model ecosystem consisting of many interacting species is introduced. The species are connected through a random matrix with a given connectivity . It is shown that the system is organized close to a boundary of marginal stability in such a way that fluctuations follow power law distributions both in species abundance and their lifetimes for some slow-driving (immigration) regime. The connectivity and the number of species are linked through a scaling relation which is the one observed in real ecosystems. These results suggest that the basic macroscopic features of real, species-rich ecologies might be linked with a critical state. A natural link between lognormal and power law distributions of species abundances is suggested.

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    Bibliographic Info

    Paper provided by Santa Fe Institute in its series Working Papers with number 99-08-060.

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    Date of creation: Aug 1999
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    Handle: RePEc:wop:safiwp:99-08-060

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    Keywords: Ecosystems; scaling; power laws;

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