Pigment characteristics of summer epiphyton in reservoirs of the Upper Volga
This study considers the pigment composition of epiphyton in reservoirs of the Upper Volga and is based on observations made in 2005, 2010, 2013-2015. It is shown that the concentration of chlorophyll a in epiphyton varies in a wide range thus characterizing heterogeneity of epiphyton distribution in the littoral of water bodies. Epiphyton development in the reservoirs under study is assessed based on the chlorophyll a content. It is established that the chlorophyll concentrations in epiphyton increase from less productive by trophic level Uglich and Rybinsk reservoirs to a more productive Ivan'kovo Reservoir. The intensity of epiphyton development on macrophytes in the Rybinsk Reservoir decreased from 2010 to 2015 that was associated with climatic conditions of the years of observations.