Approaches to allocation of dimensional classes and definition of dimensional structure indicators of phytoplanktonic communities at Volga basin

Methods of numerosity transformations of various sizes phytoplankton cells in the integrated indicator, char-acterizing dimensional structure of test are offered. Principles of splitting the samples into dimensional classes are offered, the principle allowing optimally to distinguish influence on various indicators of factors dimen-sional structure, responsible for ecological troubles, are chosen. Methods are necessary for application the in-dicators for the purpose of bioindication the water quality.