Comparative analysis of fish aggregation in channel depressions of the Irtysh |
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| Authors: | D. S. Pavlov A. D. Mochek E. S. Borisenko A. I. Degtev E. A. Degtev |
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| Affiliation: | (1) Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prosp. 33, Moscow, 119071, Russia;(2) Petrozavodsk State University, Petrozavodsk, Russia;(3) Tobolsk Biological Station, Russian Academy of Sciences, Tobolsk, Russia |
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| Abstract: | We present the results of ichthyological studies in principal channel depressions of the Irtysh developing the notions on polyfunctional biological role of these formations. The study is made by means of a computerized hydroacoustic complex “Askor”. Quantitative estimation of the size composition, abundance, density, and spatial distribution of fish on water area of channel depressions in different seasons confirms the hypothesis of multifaceted biological significance of these formations. Universal traits in the organization of fish aggregations, specificity of distribution, composition, and seasonal dynamics of the fish population on the largest channel depressions of the Irtysh are revealed. |
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