Two new locations of Isoёtes setacea Durieu (Isoёtaceae, Lycopodiophyta) are described, along with the results of a hydrochemical study of the aquatic environment in the ecotopes of this species, and a coenotic features of plant aggregations in which it is involved on the territory of the Numto Natural Park in the Khanty-Mansiysk Autonomous Okrug. Based on the hydrochemical analysis, the hydrogen ion concentration (рН) of water in the I. setacea ecotopes is 5.6 to 6.2, water color is 13 to 34 degrees of the chrome-cobalt scale, overall mineralization of water is 0.01 g/dm3, overall hardness is 0.04 to 0.09 meq/dm3. The content of oil products (petroleum hydrocarbons) is within 0.03 mg/md3. The concentrations of soluble forms of heavy metals are within the following ranges: Fe: 7.9 to 1,299.4 µg/dm3, Pb: 0.07 to 0.24 µg/dm3, Ni: 0.00 to 0.09 µg/dm3, Zn: 16.08 to 32.10 µg/dm3, Cd: 0.03 µg/dm3, Cr: 0.22 to 1.59 µg/dm3, Cu: 0.13 to 1.77 µg/dm3, Mn: 5.56 to 40.01 µg/dm3. It has been confirmed that I. setacea is linked to clear, acidic, sweet, very soft waters with low concentrations of oil products and dissolved forms of heavy metals (except for Fe). Ecological tolerance of I. setacea to elevated levels of dissolved forms of Fe reflects its adaptation to hydrochemical environment of the water bodies of the northern West Siberian Plain where surface waters with high Fe levels are common. The populations of Isoёtes setacea have been found to be linked with plant aggregations belonging to three associations: 1. Batrachospermum vagum + Isoёtes setacea; 2. Carex rhynchophysa + Carex lasiocarpa ; 3. Sparganium minimum. The discovered populations of I. setacea are recommended for bioecological monitoring as a model subject.
Isoёtes setacea, Isoёtaceae
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