Abstract
Materials on the aquatic invertebrate fauna in the Maly Patok River basin (the western slopes of the Subpolar Urals) have been presented. These water bodies, which maintain the natural hydrological regime, are located on the territory of the Yugyd-Va National Park. A total of 108 taxa (except for Chironomidae) in the zoobenthos samples and the invertebrate qualitative collections taken in the summer periods in 1996, 2000–2007, and 2017 are identified. Among them, amphibiotic insects prevail in the watercourses, while oligochaetes and mollusks dominate in the lakes in regards to number of species. Mayflies of the families Baetidae and Heptageniidae, stoneflies of Perlodidae, caddisflies of Rhyacophilidae and Apataniidae, and the Elmidae beetles are mostly present in the rivers. Oligochaetes of Naididae and mollusks of the families Planorbidae and Sphaeriidae are most abundant and diverse in the lakes. The most frequent species have Palearctic (29.0%) and Holarctic (25.5%) habitat ranges. In addition to the widespread European species, some species are recorded that have the largest part of their ranges in Siberia. Rare species in the fauna composition have been revealed.
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