Abstract
The article is devoted to the study of the productivity of mixed cultures of microalgae Desmodesmus armatus (Chod.) Hegew. and Acutodesmus dimorphus (Turpin) Tsarenko. Algae were mixed in the following ratios: D/A (1:1), D/A (1:2) and D/A (2:1). The efficiency of mixed cultures growing was compared with that for monocultures of D. armatus and A. dimorphus. Mono- and mixed cultures of algae were grown in Tamiya for 21 days, in a climatic room. Every three days, the amount of biomass was analyzed according to the density of the culture. By the end of the stationary growth phase, the biomass productivity of mono- and mixed algal cultures was analyzed. It was noted that the largest amount of biomass accumulates in the mixed D/A culture (1:1) on the 12th day of cultivation. The nutrient content in the mixed cultures biomass depends on cultivation conditions and does not significantly differ from that for monocultures of both species. The highest amount of total protein was observed in the mixed D/A culture (1:1). The content of chlorophyll a and b differs slightly in the three variants of mixed cultures and is at the level of the monoculture indicator. The content of carotenoids conclusively decreased in 1.6 - 1.8 times in mixed cultures as compared to monocultures. The biomass of a mixed culture of D. armatus and A. dimorphus in a 1: 1 ratio can be used to grow the freshwater zooplankton.
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