Composition and Structure of Benthal Algocenoses of a Large Eutrophic River (Example of the Oka River, Russia) II. Abundance Indicators and Species Diversity of Communities

Abstract

The indicators of quantitative development (abundance, biomass) and spatial heterogeneity of the characte-ristics of the species structure (species diversity, evenness, dominance) of the benthal algocenoses of the mouth of a large eutrophic-hypertrophic river in the period after the recession of the flood are characterized. The similarity and difference in the species structure in different types of benthal communities with a more complex organization of epilithon and epiphyton at the initial stage of substrate colonization was demonstrated. Relationships of these indicators with the determining factors of the environment in the absence of biogenic limitation were revealed.