Abstract
Generation time is supposed to be an important factor for the evolution of host-parasite relationships. The shorter an organism’s generation time, the faster its potential rate of evolution. Thus, short-lived hosts (the generation time is equal to or only slightly longer than that of the parasite) can be thought as being involved in an arms race where new host defences select for new parasite offences and vice versa. On the other hand, long-lived hosts are unlikely to match the faster evolving attack possibilities of parasites. Therefore the evolution of “covenants” may account for the continued persistence of such host-parasite systems (Freeland 1986).
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