We investigated theoretically and empirically the population dynamics of calliphorid dipterans collected in three areas with different urbanization profiles. Three mathematical models were combined to describe the population dynamics of blowflies, focusing on population growth, local migration and interspecific competition. Monthly collections were made in three municipalities in São Paulo State, Brazil, for twelve months, employing traps. Calliphorid dipterans were the most abundant among the necrophagous flies. The population dynamics of the two most abundant species, C. megacephala and C. albiceps, were investigated with modelling.

Results/Conclusions

Population behaviors were strongly influenced by demographic values, probably originating from endogenous factors combined with exogenous and seasonal factors in the different localities. Migration had a stabilizing effect on the populations of both species. Demographic stochasticity influenced local extinctions, revealing the more susceptible populations. The parametric space of interspecific competition coefficients and migration were investigated, indicating areas where competitive exclusion was prone to occur. The results raise interesting questions about community dynamics, suggesting future studies on metacommunities.