(1) A model of population regulation by emigration is developed based on and temporal heterogeneity of natural environments; (ii) unequal resource pa among individuals of single species populations. This latter phenomenon has viously been taken into account by theoretical ecologists, although it is of basic tance for regulation of population density. (2) Unequal resource partitioning increases the stability of a confined popu allows emigration of some population members into suboptimal and hostil evolve by individual selection. (3) In a local habitat supplied by a constant inflow of food, animal density is lo food density is higher when emigration occurs, than without emigration. (4) Regulation of population density by emigration allows for the adjustme density to the amount of food, in such a way that mortality is not directly due shortage but to other agents (predators, adverse weather conditions, etc.). (5) Animals with overlapping generations and cyclic changes in population dens emigrate at lower density level, than that determined by food supply at any given time. At high densities such populations can also exhibit reduced reproductio under certain circumstances can be considered as an adaptation. (6) Population outbreaks are thought of as a failure of population regula emigration resulting from spatial homogeneity of the environment. Hom diminishes both differences among individuals in local populations and dif between local habitats and their surroundings, these in turn can make regu emigration impossible

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