Successions: Difference and Similarity of General Ecological and Hydrobiological Views

The article discusses the features of what is called “hydrobiological succession of flowing waters” in modern scientific literature. These features are associated with the dual nature of such changes: temporal (classical, inherent in a given geographical point) and spatial (“longitudinal”) successions (in the latter case, it is more accurate to speak of “clinal” changes—ecoclines, topoclines, etc.). This makes it possible, on one hand, to correct modern knowledge about flowing waters and, on the other hand, to contribute to a better understanding of succession as a general ecological concept.