Effect of Global Warming on Fish Population Parameters in Upper Volga Reservoirs

As a result of global warming, the average annual water temperature has significantly increased in the Upper Volga reservoirs. Warming and the subsequent deterioration of the oxygen regime has had a significant effect on most of the fish populations inhabiting temperate waters. This has led to chang...

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Bibliographic Details
Published in:Inland water biology 2024-08, Vol.17 (4), p.602-618
Main Authors: Gerasimov, Yu. V., Solomatin, Yu. I., Bazarov, M. I., Lapshin, O. M., Tsvetkov, A. I.
Format: Article
Language:English
Subjects:
Abundance
Animal population
Biodiversity
Biomedical and Life Sciences
Climate change
Dominant species
Fish
Fish populations
Freshwater & Marine Ecology
Geoecology/Natural Processes
Global warming
Growth rate
Ichthyology
Introduced species
Life Sciences
Lota lota
Oxygen
Pelagic zone
Population decline
Population structure
Reservoirs
Vendace
Water temperature
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Summary:As a result of global warming, the average annual water temperature has significantly increased in the Upper Volga reservoirs. Warming and the subsequent deterioration of the oxygen regime has had a significant effect on most of the fish populations inhabiting temperate waters. This has led to changes in the population structure of many fish species. Phenomena such as the disappearance or a sharp decline in the abundance of cold-water species (European smelt, vendace, burbot, and pike) in the Rybinsk Reservoir coincide with the period of warming. The disappearance of European smelt in the Rybinsk Reservoir and the favorable temperature regime has contributed to the appearance and rapid increase in the abundance of a Caspian invader, the Black Sea sprat, which has occupied the empty niche of the European smelt and became the dominant species in the pelagic zone of the Upper Volga reservoirs. Warming has resulted in a decrease in the abundance and the growth rate of burbot and pike. Climate warming has had an indirect effect on many species through oxygen deficiency or the transformation of the forage base (ruff, zander, perch, and roach), which has also led to a decrease in abundance and the growth rate.
ISSN:1995-0829
1995-0837
DOI:10.1134/S199508292470024X