Home – Home – Jornals – Contemporary Problems of Ecology 2010 number 4

In the phytoplankton of some studied waterbodies of the north-eastern part of West Siberia, Bacillariophyta belongs to the dominant group among 7 algae orders, with respect to the species diversity with the occurrence of the representatives of the class Centrophyceae from 27 up to 100 %. With the help of electron microscopy, the first complete data on the species composition of Centrophyceae class dominаting in the phytoplankton of Lake Delingde, the Delingde and the B. Kheta rivers were obtained (Aulacoseira - 3, Cyclostephanos - 1, Cyclotella - 5, Discostella - 1, Melosira - 1, Pliocaenicus - 1, Puncticulata - 1, Stephanodiscus - 6).
The list of the representatives of Centrophyceae class in River Taz was supplemented with Puncticulata radiosa. For the first time for the flora of West Siberia, the new species of Cyclotella genus were found: : C. arctica, C. comensis, C. vorticosa. This allowed us to define more exactly the ranges of these rare taxa and broaden the diagnoses of C. comensis and Stephanodiscus invisitatus.