In 2015, the researchers held field studies of 98 water bodies of the West Siberian Plain and held a simultaneous study of the aquatic macrophyte biodiversity and water parameters in aquatic ecotopes of Tyumen Region (including Khanty-Mansiysk Autonomous Area) and Omsk Region, covering the territory from 54°20′ N to 61°40′ N and from 63º30′ E to 74º50′ E. The work was aimed at improving the system of phytoindication of the water qualitative condition based on the data on the ecological tolerance of aquatic macrophytes belonging to different systematic groups. In total, the researchers identified 138 species of macroscopic aquatic plants belonging to 72 genera, 46 families, 8 groups, including 1 species of Rhodophyta, 7 of Charophyta, 31 f Chlorophyta, 5 of Xanthophyta, 12 of Bryophyta, 1 of Equisetophyta, 2 of Polypodiophyta, 79 of Magnoliophyta. For these species, рН, mineralization and water hardness ranges (and individual values) were given within the studied aquatic ecotopes located in the West Siberian Plain. New data obtained in Khanty-Mansiysk Autonomous Area support the occurrence of some species in ecotopes with acidic environment and low concentration of salts, i.e. in extremely fresh and very soft waters. Corrections were made to previously described рН ranges and halotolerance limits toward more acidic, extremely fresh, very soft waters for Equisetum fluviatile, Nuphar lutea, Nuphar pumila, Nymphaea candida, Nymphaea tetragona, Persicaria amphibia, Hippuris vulgaris, Alisma plantago-aquatica, Eleocharis palustris, Potamogeton gramineus, Phragmites australis, Sparganium angustifolium, Sparganium emersum. The materials obtained in the southern areas of the West Siberian Plain revealed the ability of Spirogyra decimina, Zannichellia repens to withstand alkaline environment, higher mineralization and water hardness as compared to previously known parameters. As for the species found in the West Siberian Plain for the first time ( Nitella syncarpа, Spirogyra daedalea, Spirogyra dictyospora, Spirogyra rugulosa, Spirogyra subcolligata, Vaucheria aversa, Chaetophora incrassata ), as well as species remaining underexplored within their areas ( Zygogonium ericetorum, Percursaria percursa, Salvinia natans, Ruppia maritima, Najas marina ), the researchers obtained new data that significantly updates previously known information on the tolerance to the discussed aquatic environment factors.
gidromakrofity, ekologicheskaya tolerantnost', faktory vodnoy sredy, aktivnaya reakciya, mineralizaciya, zhestkost', vodnye ob'ekty, Zapadno-Sibirskaya ravnina
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