Simulation parameters dialog - population dynamics
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These options will allow you to make the simulated population either open or closed.
Births and deaths/Immigration and emigration: check the tickbox if you want the population to change during the simulation.
Death rate: Enter a value for the proportion of the population that will die or emigrate between sampling periods.
Birth rate: Enter a value for the proportion of the population that will be born or immigrate between sampling periods.
Setting very high birth and death rates, or rates that differ significantly, can lead to rapid extinction of the entire population, or massive proliferation of the number of individuals. The latter can cause the performance of your computer to slow down while the simulation is in progress.