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  • The number of susceptible trees increases with the growth of new susceptible trees and decreases due to infestations originating either inside the patch or from other patches, thus: Si(t+1)=Si(t)−numS to I,i(t)+num0to S,i(t)−numS to IT,i(t)(15) The infested trees increase correspondingly increase due to spread of infestation, but their number decreases when infested trees die: Ii(t+1)=Ii(t)+numS to I(t)−numI to R(t)+numS to IT(t)(16) Finally, transitions between the numbers of local and transport strategists are given by NL,i(t+1)=NL,i(t)−numL to T(t)+numT to L(t)(17) NT,i(t+1)=NT,i(t)+numL to T(t)−numT to L(t)(18) Baseline parameter values were obtained from empirical data concerning tree species, forest pest infestations, and firewood costs (Table 2).
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