Meromixis and Seasonal Dynamics of Vertical Structure of Lake Uchum (South Siberia)
D. Y. ROGOZIN1,2, V. V. ZYKOV1, E. A. IVANOVA2, T. N. ANUFRIEVA2, Y. V. BARKHATOV1, E. B. KHROMECHEK1, I. Y. BOTVICH1
1Institute of Biophysics, Siberian Division, RAS, 660036, Krasnoyarsk, Akademgorodok, 50/50
2Siberian Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
Keywords: меромиксия, сероводород, стратификация, соленое озеро, фототрофные серные бактерии, фитопланктон, зоопланктон, донные отложения, meromixis, hydrogen sulphide, stratification, salt lake, phototrophic sulfur bacteria, phytoplankton, zooplankton, bottom sediments
Abstract
For the first time the seasonal dynamics of the vertical structure of small salt Lake Uchum, located in the steppe arid zone of the South of Siberia (the Krasnoyarsk Krai), has been studied in detail. It is shown that this lake is a meromictic water body. A heterogeneous vertical distribution of plankton organisms and a dense population of purple sulfuric bacteria in the redox zone were revealed. The taxonomic composition and seasonal dynamics of phyto- and zooplankton were described. Presumably, the meromixis of Lake Uchum is due to the inflow of fresh water to the surface of the saline water body during the rise of its level in the early 20th century, similar to Shira and Shunet lakes located nearby. The processes of salt displacement into the solution during the formation of ice, as well as the precipitation of salts in the winter, also contribute to the maintenance of permanent stratification. Obtained information on the current state of the lake can be useful for reconstructing the climate by bottom sediments, as well as for creating models of water quality and studying the therapeutic properties of lake mud.
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