Centric Diatoms (Centrophyceae, Bacillariophyta) in Watercourses and Waterbodies in the Southeast of the West Siberian Plain and the Polar Ural
S. I. Genkal1, R. Y. Romanov1
1 I.D. Papanin Institute for Biology of Inland Water RAS
2 Central Siberian Botanical Garden SB RAS
genkal@ibiw.yaroslavl.ru
Keywords: phytoplankton, waterbodies and watercourses, West Siberian Plain, Polar Ural, the Ob, the Irtysh, Bacillariophyta, Centrophyceae
Pages: 541-555
Abstract
The study of phytoplankton from rivers and lakes in the southeast part of the West Siberian Plain and the eastern macrosclope of the Polar Ural with the help of scanning electron microscopy has revealed 25 taxa of Bacillariophyta from the class Centrophyceae (Aulacoseira - 7, Cyclostephanos - 1, Cyclotella - 4, Discostella - 2, Melosira - 1, Puncticulata - 1, Stephanodiscus - 7, Thalassiosira - 2), including new species for the flora of the investigated waterbodies. The revision of the species composition of Centrophyceae in waterbodies and watercourses in the southeast part of the West Siberian Plain has allowed more exact identifying the taxonomic spectrum of this class. At present the list includes 55 species, varieties and forms. During the first studies conducted in rivers and lakes of the Lyapin River basin (Polar Ural) 16 species of centric diatoms belonging to the genera Aulacoseira, Cyclostephanos, Cyclotella, Discostella, Puncticulata, Stephanodiscus have been recorded.
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