Dynamics of water blooming in the area in front of the Kuibyshev reservoir dam

The results of studies of the vertical distribution and seasonal dynamics of phytoplankton development by chlorophyll a in the dam part of the Kuibyshev reservoir in the summer of 2012 are presented. The analysis of the nature of the formation of “flowering” of water by temperature and other physic-chemical indicators is carried out. It is shown that the dynamics of phytoplankton growth has a multi-peak structure, due not only to fluctuations in the thermal regime, but also to the nature of the vertical distribution of mineral phosphorus. Each peak of intensive phytoplankton growth reduces the concentration of phosphates in the photic layer of water to minimum values, causing its deficiency and a further decline in the “flowering” of water. In the inter-peak period, as a result of turbulent exchange, the concentration of phosphates is leveled in depth and then, under favorable conditions, everything repeats at a new stage of phytoplankton development. The data obtained demonstrate the mechanism of phytoplankton response to changes in environmental factors.