Seasonality of burden and prevalence of phototrophic (microalgal) epibionts Characidiopsis ellipsoidea, Colacium vesiculosum and Colacium sp. on dominating crustacean zooplankton (Daphnia longispina, Cyclops vicinus and Mesocyclops leuckarti) were studied in a small reservoir Bugach with cyanobacterial bloom. The correlations between the seasonal dynamics of prevalence and the dynamics of others biotic and abiotic factors were calculated. The conclusions were as follows. The substrate species, that determined the development of the epibionts on the three studied crustacean zooplankton, was Daphnia longispina (Cladocera). Despite intensive epibiotic infestation of crustacean zooplankton, epibionts did not appear to have caused non-consumptive mortality of the crustacean zooplankton. But they could have contributed to the Daphnia summer decline by increasing mortality due to its consumption by planktivorous fishes. The phototropic epibionts may successfully coexist with cyanobacterial bloom. The possible role of the epibionts in changing nutrient fluxes in pelagic food web is discussed.

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This joint work generalizes the results of the Krasnoyarsk water reservoir ecological monitoring held by the faculty, researchers and students of Krasnoyarsk State Universityа (at the moment Siberian Federal University) in 1977-2005. For the first time during the existence of the Krasnoyarsk water reservoir the many years monitoring survey resulted in the analysis of synchronously gained hydrological, hydro-chemical and hydrobiological materials; species compositions of phyto-, zooplankton, zoobenthos, periphyton have been listed; fish physiological biochemical characteristics have been given. Biota structural functioning organization, its productive-destructive dynamics have been shown. Regression equations have been calculated by quantitative link between average-vegetation and august values of the biota components' density, production and destruction. The complex evaluation of the water quality by its chemical and biological (bio-indication, bio-testing) descriptors has been done for the first time; the following systems modified for the Krasnoyarsk water reservoir have been developed: «system of saprotaxob analysis», «Woodiviss biotic index system», «Unified classifier of water quality assessment by chemical and biological values»; the ecosystem condition has been evaluated by many-year monitoring survey of phyto-, and zooplankton has been done and its ecological modifications have been determined. The mathematical aspects of the biota and water quality analysis and the computer model of the water reservoir ecosystem condition have been described for the first time. The monograph is aimed at professionals and students majoring in hydro-ecology, fish breeding industry, experts in environmental protection and use of water resources.