Russian Journal of Ecosystem Ecology (Jun 2023)
TAXONOMIC COMPOSITION AND QUANTITATIVE CHARACTERISTICS OF MACROZOOBENTHOS OF THE YENISEI RIVER IN THE AREA OF THE VOROGOVSKY MULTI-ISLAND
Abstract
Background. Macrozoobenthos is an important component in the ecosystem of the Yenisei River, primarily as a fodder object of commercial fish species. The last complete description of the zoobenthos community of the Yenisei River (from the confluence of the Angara River to the estuary) is presented in the article of 1957. Accordingly, there is no more up-to-date information about the state of macrozoobenthos. The purpose of this work is to establish the taxonomic composition and quantitative characteristics of macrozoobenthos in the area of the Vorogovsky multi–island. Materials and methods. The study of the macrozoobenthos of the river was carried out at two sections (6 stations): in the districts of Verkhny Vygov Island and Monastyrsky Island. The samples of zoobenthos were selected and processed according to the methods generally accepted in Russian hydrobiology. All samples were taken in three repetitions. Results, conclusions. During the study, 41 species from 11 taxonomic groups were identified in zoobenthos, including oligochaetes, gastropods and bivalves, amphipods, water mites, mayflies, caddisflies, beetles and diptera. The average values of the density in the bottom community of the Yenisei River in the two studied areas fluctuated slightly: in the area of Verkhny Vygov Island, the average abundance and biomass amounted to 690±326 ind./m² and 3.08±2.28 g/m², in the area of Monastyrsky Island to 645±142 ind./m² and 2.98±0.86 g/m², respectively. According to the level of the development of the macrozoobenthos community, the section of the river belongs to the low-feeding type. The structural and functional basis of the bottom community of the Yenisei River in the area of Vorogovsky multi–island consists of amphipods, mollusks and oligochaetes.
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