It was detected that Typha angustifolia Linnaeus, 1753, has a significant level of ecologic plasticity
under action of nitrate-nitrogen. It included alterations in production processes (increase in number of bines,
chlorophyll a and b concentration, potential seed productivity, general biomass, average height of plants) and
respiration metabolism (restoration of the oxygen consumption till initial values). Adaptation of the macrophyte
to anthropogenic load also resulted in enhancement of the excretory potency of the plant and in intensification
of its algaecide and sanative activities. In biotopes without the macrophyte the effects were not detected.