or Ne = 11.6. Thus the fire caused a major reduction in the overall effective population size. The population experienced about the same amount of genetic drift over these three generations as an ideal Wright-Fisher population with an effective size of 12 individuals. One assumption is this analysis is that these animals approximate organisms that breed only once during their lifetimes. This assumption is often unmet for animals and additional reductions in the effective population size can arise if mating occurs between members of overlapping generations since related individuals can mate (see Nunney 1993 and an application in Ollivier & James 2004).

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