COMPARISON OF POPULATIONS OF HERBIVOROUS MAMMALS WITH DENSITY, TROPHIC, AND DENSITY-TROPHIC DEPENDENT TYPES OF REGULATION

Mathematical models of population dynamics of herbivorous mammals with three types of regulations are formalized and generalized. Variation of some population characteristics under influence of fodder vegetatio n productivity and population parameters are considered. Regulatory me chanisms and productivity characteristics of populations (biomass, pro ductivity, production formation efficiency) are analyzed for different types of regulation. Populations with mixed density and trophic depen dent regulation are shown to take intermediate position between those with density dependent and with trophic dependent regulations. The fir st type of regulation thus may be considered as more general one, whil e the two others are its extreme cases. Mechanisms of realization of t hese regulation types and their examples are considered.