The dynamics of the number of rodents in the territory of landscape and ecological provinces of the south of Tyumen region

In the study the indicators of species richness, dominance structure, population dynamics miсromammal communities in five landscape-ecological provinces within the south territories of Tyumen Region are analysed. For small mammals caught by Gero's dies the indicator of abundance (number), i.e. the number of small animals who got for days of work of 100 traps was used (for 100 trap-nights). Species richness is represented by a maximum of 9 species of animals, mostly found 5-6, 3-4 species, depending on the habitat area. So, in the territory of Tobol-Ural province the greatest specific variety of small rodents to the values of which the indexes of Margalef and Menkhinik testify is recorded. The smallest quantity of the caught types is noted in Tobol-Irtysh province (1 species during a registration season). The structure of dom-ination in the studied territories differs in specific structure and the quantity of prepotent and sub-dominant types. So, in the territory of four provinces red vole (Myodes (Clethrionomys) rutilus) plays dominating role. Field mouse (Apodemus agrarius) and ordinary common shrew (Sorex araneus) also often become prepotent types. Berger-Parker's in-dex for red vole reaches the value of 0.62 in Ishim province (2008); for ordinary common shrew - 0.6 in the territory of Privagay-Irtysh province in 2002. The analysis of dynamics of number of communi-ties of small rodents allows allocating two land-scape and ecological provinces with slight increase of quantitative indices (Tobol-Ishim Entre Rios and the Tobol-Ural province). In three other provinces the reduction of the number of species for the stud-ied period in 12 years (1999-2012) has been ob-served. The fluctuations of number have various amplitudes; the maximum amplitude is noted in dynamics of the number of rodents in the territory of Tobol-Irtysh province, with 30 frequency rate. The period of fluctuation makes 2-3 years and 6-7 years. The number peak in 2006 was registered in three provinces: Tobol-Ural, Ishim, Tobol-Irtysh.