If g N Z Et f N Z v gNt Zt t [fNt Zt v otherwise

Although marten abundance varies considerably less (Fig. 19.11) than was the case for fixed quota (Figs 19.5 and 19.6) or fixed proportion (Figs 19.8 and 19.9) policies, harvest varies even more according to this policy (Fig. 19.12).

Fig. 19.11 Predicted variation in marten abundance under a fixed escapement harvest policy, with an escapement (v = 723) appropriate to the maximum sustainable yield (H = 423 martens per year), starting from a population size of 400 animals in 1973.

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