Specificity of the seasonal dynamics of picoplankton communities in lotic aquatic ecosystems

Studies were carried out of the seasonal dynamics of quantitative parameters of picoplankton: the total number of bacteria, the number of bacteria with an active electron transport chain and their share in bacterioplankton, the number of autotrophic picoplankton, the content of chlorophyll a and its picofraction, as well as temperature and hydrochemical regimes in the waters of three stations with different levels biogenic pollution on the Moscow River. The highest values of all studied parameters were observed for waters at st. NKS is the zone of direct influence of the Kuryanovsky treatment facilities. A bimodal type of seasonal dynamics of picoplankton was observed: for autotrophic picoplankton, maximum abundance was observed at the end of April and June, for bacterioplankton – in July and October.