Composition and Structure of Benthic Algocenoses of a Large Eutrophic River (Using the Example of the Oka River, Russia): II. Abundance Parameters and Species Diversity of Communities

Abstract—The quantitative (abundance and biomass) development and spatial heterogeneity of the species structure (species diversity, evenness, and dominance) of benthic algocenoses in the mouth of a large eutrophic–hypertrophic river after flood recession are characterized. The similarity and difference in the species structure of different types of benthic communities with a more complex organization of epilithon and epiphyton at the initial stage of substrate colonization is demonstrated. The relationship between these parameters and the determining factors of the environment in the absence of nutrient limitation are revealed.