Changes in the structure of ichthyofauna in water bodies of Kaluga oblast over the past few decades |
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Authors: | Yu S Reshetnikov T N Dyakina V V Korolev |
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Institution: | 1.Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The structure of the ichthyofauna in water bodies of Kaluga oblast has undergone significant rearrangements over the past
20 years. The abundance of some species has increased, while that of other species has decreased; spontaneous dispersal of
some fishes is underway. Synchronous fluctuations of fish abundance (“waves of life”) take place simultaneously in the Western
Dvina, Dnieper, and Volga basins. These processes differ in intensity depending on fish species and are conditioned by a number
of factors, including changes in hydrological regimes of rivers, improvement of the ecological state of small rivers, and
increased poaching pressure. The results of monitoring the ichthyofauna fauna of small rivers are used as an example to trace
the routes of fish dispersal and discuss changes in the composition of fish communities. |
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