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The Evolution of Diversity in Replicator Networks

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Abstract

Novel species are introduced into a network of interacting replicators either (i) as mutants of members of the network or (ii) as unrelated immigrants. We consider the meta-population dynamics of such a system. In the first case, the appearance of mutants leads to a slow growth of the replicator network, proportional to the logarithm of the number of mutation events. Surprisingly, replicators evolved by mutant incorporation are always permanent, despite the fact that permanence is, in general, a very rare phenomenon. In the second case, immigrants lead to frequent breakdowns of the entire network and, hence, to complete extinction. In both cases, individual species are short-lived, the distribution of survival times is exponential.

Suggested Citation

  • Robert Happel & Peter F. Stadler, 1997. "The Evolution of Diversity in Replicator Networks," Working Papers 97-07-061, Santa Fe Institute.
  • Handle: RePEc:wop:safiwp:97-07-061
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