FORMATION OF THE LAKE TYPE ECOSYSTEM IN SEMIDESERT ZOON: TAYSHIR RESERVOIR IN THE ZAVKHAN RIVER (WESTERN MONGOLIA)
On the basis of materials collected in the Tayshir Reservoir after its formation, plankton and benthos production were estimated. Species ratio, growth and diets of fish have been considered also. High abundance and increasing of maximum sizes of Potanin's altai osman ( Oreoleuciscus potanini ) are revealed. The benthic organisms dominated in food of all three species of fish: Potanin's altai osman, Mongolian grayling ( Thymallus brevirostris ) and Siberian stone loach ( Orthrias barbatulus toni ) which inhabited the Tayshir Reservoir.