Cool and interesting. The authors study how an artificial replication mechanism evolves to cope with emerging faster-replicating parasites in a spatial setting

Cool and interesting. The authors study how an artificial replication mechanism evolves to cope with emerging faster-replicating parasites in a spatial setting. Extinction occurs in about half the cases due to quick emergence of the fast-replicating parasites, but if the system survives long enough, the authors observe long-term evolution of intricate replication mechanisms for coping with the parasites, including slower replication and higher mutation rates. Quoting from the OP: "Diverse ecosystems evolve, with relatively long replicators, subdued parasites, and large population densities. The replicators may even subdue parasites to such an extent that the parasites become rare, and then the replicators, not needing the defence against parasites any more, lose their complex countermeasures and become simpler and shorter; but new parasites emerge, reversing this trend again."