The morphotypical diversity in the structure of chewing tooth surfaces M3 of red vole (Clethrionomys rutilus Pallas, 1779) (Rodentia, Cricetidae) in north and middle taiga of Tyumen oblast

The analysis of a structure of chewing surface М3 of the red vole of northern and average taiga of the Tyumen region has shown that in northern taiga red voles have more difficult structure of chewing surface М3, in comparison with an average taiga. That is an adaptation to food with higher percentages of seed and non-green fodder. The same tendency was noted for the areas located in the watershed, compared to the flood plain. A variety of morphotypes M3 in the northern taiga poorer than average. Chewing surface of tooth M3 juveniles red vole is characterized by higher complexity than the adult individuals, that is connected with abrasion of the tooth crown and a decrease in the number of incoming angles.