Аннотация:Some features of morphogenesis species with different population strategies in destabilized environment were studied. 12 signs of the mandibles Clethrionomys glareolus (the climacteric species) and Microtus oeconomus (the pioneer species), inhabiting the early stages of succession after felling of spruce forests in the southern taiga were used. Significant differences of degree and the character of correlation development of signs compared the species were found at these conditions.