Diversity of Oligochaeta fauna in small water bodies of the middle taiga zone
The paper considers species composition, fauna diversity and distribution of Oligochaeta in small water bodies of the middle taiga subzone on sample of the Vychegda River. Very diverse are small tributaries with dense grounds covered with algae and mosses and with high flow rate. Low diverse are rivers with sandy grounds. Species composition of Oligochaeta depends on ecological factors as water chemical composition, flow rate, presence of bottom fouling, ground composition, less on depth and temperature. Small rivers even in one geographical zone have a specific complex of conditions for formation of a unique complex of species in every particular water body.