Ecolab, Webworld and self-organisation

Details Ecolab, Webworld and self-organisation Ecolab, Webworld and self-organisation

2004-04-06

arxiv.org/abs/nlin/0404011v1

Artificial Life IX, Pollack, J. et al., (Cambridge, MA: MIT Press), 358-363. (2004)

Nonlinear Sciences

Adaptation and Self-Organizing Systems

Accepted for Artificial Life IX. Final MS

Scientific paper

Ecolab and Webworld are both models of evolution produced by adding evolution to ecological equations. They differ primarily in the form of the ecological equations. Both models are self-organised to a state where extinctions balance speciations. However, Ecolab shows evidence of this self-organised state being critical, whereas Webworld does not. This paper examines the self-organised states of these two models and suggest the likely cause of the difference. Also the lifetime distribution for a mean field version of Ecolab is computed, showing that the fat tail of the distribution is due to coevolutionary adaption of the species.

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