Industrial areas in proximity to the Vodny settlement in the Komi Republic, Russia, have been contaminated by uranium mill tailings and radium production wastes. These areas, exhibiting high activity concentrations of naturally occurring radionuclides in soils, constitute a field laboratory where the effect of combined chronic exposures to α-, β-and γ-emitting radionuclides on natural plant populations can be studied. The aim of the present work was to determine dose-effects relationships and the range of doses that cause biological effects in natural populations of plants and animals inhabiting the study area. The significant biological effects were found to observe at weighted absorbed doses equal to n⋅10-3 Gy/day. Unlinear models fit the relationship between weighted absorbed dose and biological effect level observed in plants and animals better than the linear one.