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Hydrobiological Journal
SJR: 0.227 SNIP: 0.575 CiteScore™: 0.24

ISSN Imprimir: 0018-8166
ISSN En Línea: 1943-5991

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Hydrobiological Journal

DOI: 10.1615/HydrobJ.v49.i3.40
pages 41-57

Centric Diatoms (Centrophyceae) of the Lower Reaches of the Oka River (Russian Federation)

S. I. Genkal
I.D. Papanin Institute for Biology of Inland Waters of RAS, Settle Borok, Nekouz District, Yaroslavl Region 152742, Russia
A. G. Okhapkin
Nizhniy Novgorod State University Nizhniy Novgorod, Russia; Institute of Biology of Inland Waters Russian Academy of Sciences Borok, Russian Federation


A total of more than 30 species and varieties of centric diatoms of 10 genera was found in phytoplankton of the lower reaches of the Oka River. They included algae species − new for the flora of the river (Actinocyclus normanii, Contricridra weissflogii, Cyclotella ambigua, C. choctawhatcheeana, C. marina, Stephanodiscus delicatus, S. volgensis, Thalassiosira faurii, and T. incerta), and also for the flora of Russia - Cyclotella marina. Both freshwater and brackish water algae species, and also brackish water and freshwater organisms, were found among representatives of Centrophyceae. This phenomenon is accounted for by the dynamics of abiotic conditions (climatic changes, the increase in water salinity, in the degree of contamination, and also in the trophic level) registered in water bodies of the Volga River basin from the second half of the XX century.

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