Abundance and biomass of nano- and microplankton near large seaport cities

Degree of development of heterotrophic nano- and microplankton in various ocean harbors subject to considerable anthropogenic effects is evaluated. Qualitative composition of heterotrophic organisms is examined, data on relative abundances and biomass, degree of consumption and rates of reproduction of nano- and microplankton are presented. The role of these organisms in self-purification of inshore sea waters is analyzed.