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Artificial Life

Spring 1997, Vol. 3, No. 2, Pages 81-100
(doi: 10.1162/artl.1997.3.2.81)
© 1997 Massachusetts Institute of Technology
Evolutionary Stagnation Due to Pattern-Pattern Interactions in a Coevolutionary Predator-Prey Model
Article PDF (9.25 MB)

We consider a spatially stmctured model of a coevolutionary predator-prey system with interactions in a one-dimensional phenotype space. We show that in phenotype space predators and prey organize themselves into distinct clusters of phenotypes called quasi-species. The prey quasi-species also cluster in patches in real space. As the prey quasi-species evolve away from the predator quasi-species (in phenotype space) the prey patch size reduces and the single predator quasi-species is inhibited from evolving toward either of the two prey species. We show that it is the interaction between the phenotype space patterns (quasi-species) and the real space patterns (patches) that inhibit the predators from evolving.