Taxonomic Composition of Ground Invertebrates and Their Ratio in Different Types of Deciduous Forests within Tobolsk District of Tyumen Region
The composition and spatial distribution of the surface & litterdwelling mesofauna in leaved forests the indigenous terrace of the Irtysh river are analyzed on the basis materials of accounting for invertebrates by soil traps. The surveys were carried out in 2005-2010 in three types of forests - aspen forest, lime forest and birch forest, located within Tobolsk district of the Tyumen region (southern taiga, Western Siberia). As a result, 281 species of invertebrates were identified in forests, about 50% of which were in the families Carabidae, Staphylinidae and Linyphiidae. Indicators of species richness and the dynamic activity of mesofauna was reduced in a series of aspen forest - lime forest - birch forest. In aspen forest there has been the highest concentration of Carabidae, Staphylinidae and Opiliones, in lime forest - Aranei, Curculionidae, Heteroptera and larvae Diptera, in birch forest - Silphidae and Lumbricidae. Dominant complex in all forests was represented by Coleoptera, the common dominant was Pterostichus oblongopunctatus (Fabricius, 1787). Greatest similarity of species composition, dynamics and abundance of individual groups of ground mesofauna in three types of forest was found between aspen forest and lime forest. Specificity of each community is given by, presence and relative abundance which is associated with the character of forest litter, grass-shrub layer and bordering forests biotopes.