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Hydrobiological Journal

ISSN Print: 0018-8166
ISSN Online: 1943-5991

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v41.i5.10
pages 3-7

Some Structural and Functional Peculiarities of the Ecosystems of the Main Mountain Tributaries of the Danube River Basin

M. I. Cheredarik
Chernovtsy National University, Chernovtsy Regional Soviet of the Ukrainian Society of Nature Conservation, Ukraine
V. I. Korolyuk
Chernovtsy National University, Chernovtsy Regional Soviet of the Ukrainian Society of Nature Conservation, Ukraine

ABSTRACT

It has been found that hydrological peculiarities of some mountain tributaries of the Danube River, including the Prut, Siret, and Cheremosh rivers, are responsible for a rather low primary production. In all seasons decomposition predominated over production. Only in some cases, the index of the intensity of self-purification (A/R) was higher than 1 (1.05−1.10). For the most part phytoplankton net production was characterized by negative values, which testifies that allochthonous organic matter was of considerable importance in the energetic supply of the ecosystem.