Some aspects of ecology of water biota of the Namana river (Republic of Sakha (Yakutia))

Large mega-projects for the development of oil and gas reserves have a great impact on the state of natural ecosystems. The Namana river in hydrobiological terms was unexplored, earlier information about the studies of this river is absent in the literature. Therefore, due to the lack of knowledge of the territory, there are often difficulties in assessing the degree of negative impact. The published materials can be used to calculate the damage caused by the oil and gas complex to the ecosystems of the region. The aim of the work is to identify some aspects of the ecology of the water biota of the Namana river. A total of 40 samples were taken for the quantitative and qualitative composition of zooplankton. Material on ichthyology are 41 instance fish. The material was processed by conventional methods. Eight species of fish belonging to one class, three orders, six families and eight genera are established. The catches were dominated by species such as grayling and lenok, it is a medium-sized fish of interest to commercial and recreational fishing. The fauna of the fish of the investigated watercourse consists mainly of oxyphilic species of fish, demanding the purity of water, its temperature and high oxygen content. According to the survey data, the autumn migration of fish for winter positions takes place in a short time within a few days. Recreational fishing is developed on the river. In the same period of the direct catch was the most strong influence of anthropogenic impact on the fish fauna. In our catches have been absent for such a typical mountain streams species like taimen, which is also evidence of significant pressure of fishing. The autumn zooplankton of the Namana river basin is characterized by relatively low indicators of species diversity, abundance and biomass for the semi-mountainous rivers of Yakutia. The modern faunal composition of zooplankton of the studied watercourses is represented by 23 species belonging to 3 classes, 13 families, 21 genera. The basis of the species diversity is formed by branching crustaceans. The most widely represented by the number of species is the family Chydoridae. At the moment, oil and gas reserves are actively developed in the research area and it is obvious that the negative anthropogenic impact will have a multifactor nature, and in General will significantly increase.

река Намана, экология, водная биота, зоопланктон, ихтиофауна, водоток, нефтегазовый комплекс, ветвистоусые и веслоногие ракообразные, коловратки, оксифильность

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