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We introduce a model to study the impact of catastrophes on evolutionarypaths. If we do not allow catastrophes the number of changes in the maximumfitness of a population grows logarithmically with respect to time. Allowingcatastrophes (no matter how rare) yields a drastically different behavior. Whencatastrophes are possible the number of changes in the maximum fitness of thepopulation grows linearly with time. Moreover, the evolutionary paths are a lotless predictable when catastrophes are possible. Our results can be seen assupporting the hypothesis that catastrophes speed up evolution by disruptingdominant species and creating space for new species to emerge and evolve.

Evolutionary paths under catastrophes