  We study the effect of mutations in a simple model of colonization, based on
Montecarlo simulations. When the population colonizes the whole available
habitat, a maximum population density is reached, which depends on the mutation
rate. Depending on the values of other parameters, such as selection pressure,
fecundity and mobility, there is an optimal value for the mutation rate for
which the colonization reaches the highest density. We also investigate the
survival probabilities under different conditions and its relation to the
mutation rate.
