Distribution, ecology and coenotic value of chara tomentosa l. (charophyta) in the west Siberian plain

About the authors:

Tatyana V. Sviridenko, Senior Researcher, Scientific Research Institute of the Ecology of the North, Surgut State University; tatyanasv29@yandex.ru

Boris F. Sviridenko, Dr. Sci.(Biol.), Head Researcher, Scientific Research Institute of the Ecology of the North, Surgut State University; bosviri@mail.ru

Abstract:

YInformation on the distribution, ecology and coenotic role of Chara tomentosa (Charophyta) in the West Siberian Plain is summarized. Overall in this territory, 15 locations of the species are known in water bodies of the steppe and the forest-steppe belts. The species occurs in lakes, bays of rivers and water reservoirs, mainly at depths of 0.8 to 2.5 m, on grey and black muds, clear and mudded sands, coarse detrital muds, reed peat, or flooded soil. Water mineralization in the ecotopes is 0.43 to 2.80 g/dm³, overall hardness is 1.6 to 13.1 meq/dm³, рН is 7.2 to 8.4. It is shown that C. tomentosa exhibits the patient strategy being involved in the formation of stable phytocoenoses where it can occasionally be the dominant (a co-dominant). Detrital muds are shown to be the place where the rhizoid-free form of C. tomentosa exhibits edificatory properties and dominates in stable coenoses involving flowering hydrophytes Phragmites australis, Nymphaea candida, Potamogeton pectinatus, Myriophyllum verticillatum, Najas marina. Rare vegetation aggregations with C. tomentosa, that should be protected in the West Siberian Plain, have been found in the lakes Ulyanovskoe and Bolshie Chany in the Novosibirsk Region (the Russian Federation) as well as in the lakes Zharkain and Sassykkol (the Republic of Kazakhstan).

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