Given our choice of initial stock sizes and parameter values, stable cyclic
dynamics develop with population size fluctuating around 1,000 individuals
(Fig. 39.6). These fluctuations are due to the stochastic weather function and vary
between runs (Fig. 39.7). Changing the initial population in each of the stocks does
not change the timing of that cycle, only its magnitude. The cycle is in delayed
synchronization with the fluctuation of the habitat quality: peaks in stock population size are delayed by about 1.5 years following a peak in habitat quality
(Fig. 39.8).
Slightly modify the parameters for hunting and predation-induced death rates
and you will find that even small changes can have large impact on the population.
Similarly, small modifications of weather-induced mortality can have devastating
Fig. 39.3
360
39 Quail Movement
dynamics develop with population size fluctuating around 1,000 individuals
(Fig. 39.6). These fluctuations are due to the stochastic weather function and vary
between runs (Fig. 39.7). Changing the initial population in each of the stocks does
not change the timing of that cycle, only its magnitude. The cycle is in delayed
synchronization with the fluctuation of the habitat quality: peaks in stock population size are delayed by about 1.5 years following a peak in habitat quality
(Fig. 39.8).
Slightly modify the parameters for hunting and predation-induced death rates
and you will find that even small changes can have large impact on the population.
Similarly, small modifications of weather-induced mortality can have devastating
Fig. 39.3
360
39 Quail Movement