Structure and functioning manner of the ecosystems in the upper French Rhdne. VII. The hydrographic complex of the 'L6ne des P~cheurs" a former bed of the Rh~neThe hydrological analysis of one of the old meanders of the french upper Rh6ne, called the 'L6ne des PScheurs', is carried out from September 1976 to November 1977. The principal components analysis of the physico-chemical characteristics of the water shows an ecological tripartition along the longitudinal axe of the '16ne', according to the mixing processus of two types of waters, the one influenced by the lateral underflow, the other flowing in from the Rh6ne, and related with the overflow. Partitional analogies are also noted between the structure of phytoplanctonic community and the hydrological environment.
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