The communities of macrophytes: typology, dynamic, production

Abstract

The vegetation of hydrosystems has particularities in its micro-distribution (often discontinuous carpet, belts, pluri-stratification) depending on ecological factors. In rivers and streams, space and time dynamics are marked by the hydrological cycle which determines the variations of cover, and thus of production by macrophytes. Some figures of biomass and macrophytic production in river are given assessing their huge variability. A deterministic diagram of the distribution of the species and communities in the watercourses is drawn up. The phytosociological scheme of the main communities is pointed out.