Home – Home – Jornals – Contemporary Problems of Ecology 2024 number 6

Species composition and fatty acid composition, seasonal dynamics of biomass, production and productivity of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) of the zoobenthos of the Ob River and its tributaries, the Inya River and the Tula River were studied. Total contents of EPA and DHA in all taxa of zoobenthos were relatively high, except of Trichoptera, Bivalvia and Gastropoda. Values of the EPA and DHA contents felt in the ranges reported in literature for the relevant taxa from various habitats, which confirms the hypothesis about the principal contribution of the phylogenetic factor to the contents of EPA and DHA of zoobenthos. As found, a similarity of the species composition between the Inya River and the Tula River was lower than that between the Ob River and each tributary, which may be due to different hydrological features and types of bottom sediments, as well as a drift of benthic invertebrates from the tributaries into the main channel. The Ob River, the Inya River and the Tula River had nearly similar values of zoobenthos production and EPA and DHA of productivity, while they differed from these parameters of the Yenisei River and its tributaries reported in literature, which had another species composition of benthic invertebrates. As found, the EPA and DHA productivity, i. e., the biochemical quality of the fish food under similar values of the production of zoobenthos, was determined by the species composition of zoobenthos, which depended on the complex of environmental factors.