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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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Volumen 55, 2019 Volumen 54, 2018 Volumen 53, 2017 Volumen 52, 2016 Volumen 51, 2015 Volumen 50, 2014 Volumen 49, 2013 Volumen 48, 2012 Volumen 47, 2011 Volumen 46, 2010 Volumen 45, 2009 Volumen 44, 2008 Volumen 43, 2007 Volumen 42, 2006 Volumen 41, 2005 Volumen 40, 2004 Volumen 39, 2003 Volumen 38, 2002 Volumen 37, 2001 Volumen 36, 2000 Volumen 35, 1999 Volumen 34, 1998

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

SINOPSIS

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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