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

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

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v39.i1.70
11 pages

A Predominance of Lyngbya Contorta Lemm. and the Photosynthetic Activity of Phytoplankton in Brackishwater Meromictic Lake Shira

V. V. Zavoruyev
Institute of Computerized Simulation Siberian, Department of the Russian Academy of Sciences, Institute of Biophysics Siberian, Department of the Russian Academy of Sciences Krasnoyarsk, Russia
T. A. Zotina
Institute of Computerized Simulation Siberian, Department of the Russian Academy of Sciences, Institute of Biophysics Siberian, Department of the Russian Academy of Sciences, Krasnoyarsk, Russia

ABSTRACT

It has been found that in early spring and summer Lyngbya contorta Lemm. (Cyanophyta) dominates in phytoplankton of the pelagic zone of meromictic brackishwater Lake Shira. In 1998, its maximum contribution to the total biomass of phytoplankton was 80%. In 1996–1999, the average contribution of L. contorta to the total biomass accounted for 66%. The vertical distribution of phytoplankton was characterized by a stable stratification. Physical and chemical parameters of the environment, in which phytoplankton with a predominance of L. contorta possessed its photosynthetic activity were investigated. At the intensity of light of 0.2Ч10–3 W/m2 PhAR, and also at the concentration of hydrogen sulfide of 30 mg/L, L. contorta showed its photosynthetic activity. It was assumed that mass development of L. contorta in Lake Shira was conditioned by the increase in the intensity of the processes of biochemical transformation of matter in the near-bottom layer of water characterized by a high content of hydrogen sulfide occurring under the influence of anthropic load.