Chrząszcze wodne (Coleoptera: Noteridae, Dytiscidae, Gyrinidae, Haliplidae, Hydraenidae, Helophoridae, Hydrochidae, Hydrophilidae, Dryopidae) jezior dystroficznych Wigierskiego Parku Narodowego
Year: 2026
Type: article
Abstract: Water beetles (Coleoptera: Noteridae, Dytiscidae, Gyrinidae, Haliplidae, Hydraenidae, Helophoridae, Hydrochidae, Hydrophilidae, Dryopidae) of dystrophic lakes of Wigry National Park. Dystrophic lakes constitute a unique and rare type of water bodies in the lowlands of Central Europe, characterized by low pH, high humic content and low biological productivity. In the Wigry National Park (NE Poland), 20 such lakes occur among 42 lakes of the Park. The aim of the present study was to complete the knowledge of the species composition of aquatic beetles inhabiting all dystrophic lakes of this area. Field investigations were conducted between 30 June and 10 July 2025, with qualitative sampling performed at several points along the shoreline of each lake.In total, 87 species of aquatic Coleoptera were recorded during the current survey. When combined with published and unpublished data, the fauna of dystrophic lakes of the Wigry National Park comprises 117 species representing nine families. The most species-rich family was Dytiscidae (69 species), followed by Hydrophilidae (22) and Haliplidae (8). The highest numbers of species were found in Suchar IV (55 species), Suchar III (54), Suchar V (54), Suchar I (51) and Lake Ślepe (46), whereas Suchar Zachodni (8) and Suchar Wschodni (12) were the poorest.Eurytopic species predominated (37.6%), but a considerable proportion of detritophilous (30.8%), acidophilous (19.7%) and tyrphophilous (8.5%) taxa was also recorded, reflecting the specific environmental conditions of dystrophic lakes. Of particular faunistic interest are records of the protected and umbrella species Graphoderus bilineatus, which forms a stable population in Lake Widne, as well as rare species such as Hydrovatus cuspidatus, Ilybius crassus, I. similis and Dryops anglicanus.The results demonstrate that dystrophic lakes of the Wigry National Park harbour an exceptionally rich and ecologically distinctive assemblage of aquatic beetles, emphasizing their high conservation value at both national and regional scales.
Authors: Czesław Greń, Krzysztof Sućko
Institution: Instytut Badawczy Leśnictwa
Language: Polish
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W7162774151
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