Structure of terrestrial invertebrates community of meadow ecosystems in south taiga

The analysis of the dynamics of communities of invertebrate inhabitants of the grass stand in the meadow ecosystems in the period from 2010 to 2015 is presented. During the research period 419 species of invertebrates from 104 families were registered in the investigated areas. The total number of invertebrate inhabitants of the herbage varied from 620.4±65.6 to 1147±214.3 ind./100 sweeps. Leading largest groups are Hemiptera and Diptera, comprising over 50% of the whole complex of inhabitants of the herbage (chortobionts). Taxonomic compositions of plants and chortobionts of the investigated sites of grassland ecosystems were compared according to the index of Czekanowsk¬-Sørensen. The similarity of association of some sites in clusters on structure of communities of vascular plants and invertebrates is noted. The analysis of terrestrial invertebrate communities by the main component method makes it possible to determine the factors that influence the structure of the invertebrate population. Over 60% of the total dispersion is determined by the first three axes of the principial components. The first component is related to the characteristics of the plant community (the number of plant species, the Shannon diversity index and the height of the grass stand), it affects the groups Hymenoptera, Diptera and Aranei. The second component characterizes the peculiarities of the moistening regime and richness of soils and determines abundance of Orthoptera. The third component includes meteorological factors (air temperature and precipitation), it determines abundance of Orthoptera, Heteroptera and Homoptera.