Распределение хлорофилла в водной толще водохранилищ верхней волги в условиях гомотермии

Abstract

Vertical distribution of phytoplankton (chlorophyll-a, CHL) was investigated in August 2015 at 25 stations in Ivankovo, Uglich, and Rybinsk reservoirs (Upper Volga, Russia) using the submersible fluorometer Fluoroprob bbeMoldaenke. Three types of CHL vertical distribution were identified under homothermy. Gradual CHL decline in the water column at the upper site of reservoirs; a sharp decline at a certain depth of the majority of river sections; uniform distribution opposite the mouth of a small river (river Kashinka in Uglich Reservoir), as well as at the open lake-like sites of the Rybinsk reservoir under the wind mixing