The taxonomic proportions graphical analysis usage in the study of Moscow river phytoplankton

The method of graphic analysis elaborated for the lake ecosystems is described. Subsequently the similar regularities were established to the flowing water bodies. When analysing the taxonomic structure three scenarios of the transformation of freshwater diatom assemblages were allocated. Two scenarios develop in reply to the impact on the ecosystem from without. The third scenario could develop in the ecosystem, if changing the physicochemical properties of the aqueous medium or morphometric parameters of the reservoir. The taxonomic composition of phytoplankton communities in the Moscow River was studied in the area of Moscow megalopolis during 2006-2012. The samples were collected in 34 km length section of Moscow megalopolis impact zone. To analyze the structural transformation we estimated the total number of species and abundance of phytoplankton, and also used the analysis of taxomonic structure of diatom complexes with and without taking into account rare taxa. The basic regularities of spatial transformation of river phytoplankton were revealed.