Composition, structure, and formation factors of bottom invertebrate communities in lakes of the southern Ob-Irtysh interfluve

The composition and structure of bottom invertebrate communities have been studied in 37 lakes of the southern Ob-Irtysh interfluve in 2008–2011. The aquatic fauna of these communities includes 146 species of eight classes. The influence of the main abiotic ecological factors (hydrophysical and hydro-chemical parameters of water, bottom substrate type) on the composition and fauna of bottom communities have been estimated. It is shown that hydrochemical factors determining the total salt content of the water, substrate type, and water transparency have the strongest effect on the level of bottom invertebrate community development.