Extinction events and species lifetimes in a simple ecological model

Details Extinction events and species lifetimes in a simple ecological model Extinction events and species lifetimes in a simple ecological model

1998-05-18

arxiv.org/abs/adap-org/9805002v1

Phys. Rev. Lett.81, 5011 (1998)

Physics

Condensed Matter

Statistical Mechanics

4 pages RevTex, including 3 postscript figures

Scientific paper

10.1103/PhysRevLett.81.5011

A model for large-scale evolution recently introduced by Amaral and Meyer is studied analytically and numerically. Species are located at different trophic levels and become extinct if their prey becomes extinct. It is proved that this model is self-organized critical in the thermodynamic limit, with an exponent 2 characterizing the size distribution of extinction events. The lifetime distribution of species, cutoffs due to finite-size effects, and other quantities are evaluated. The relevance of this model to biological evolution is critically assessed.

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