The Bottom Sediments as a Factor Affecting the Russian Desman Habitat Conditions in the Floodplain Lakes of the Sura River Basin
https://doi.org/10.31857/S0869607122010049
Abstract
The studies of the role of floodplain waterbodies’ bottom sediments in the Russian desman (Desmana moschata Linnaeus, 1758) life are not numerous and even controversial. The paper presents the data on the composition and properties of the bottom sediments in the floodplain lakes in the Prisursky State Nature Reserve buffer zone (the Sura river lower course, the Middle Volga Region). The ground survey including the surface and core sampling according to bathymetry was carried out in the reservoir areas inhabited by desman. The clayed silt with the silt and light aleurite fractions prevalence and with the organic mat ter content of 2.1–26.8% predominates. The grain size composition reflects the mild flow dynamics in the Sura river lower course floodplain during the spring flood, which results in alluvial light fractions deposition on the lakes’ bottom. Desmans prefer the sediments with the density of 1.0 g/cm3 and more for burrowing operations. The average nitrogen content in the sediments in the floodplain lakes of the Sura basin reaches 0.27%, the average phosphorus content is 0.24%. The thickness of the lakes’ deposits varies from 30 to 100 cm and even more, that make possible to estimate the average rate of the sediment accumulation as 2– 3 mm/year, and the relative age of the deposits (and the lakes) as 200–300 years. In studied lakes, the bottom sediments composition and properties as well as the sediment accumulation conditions in combination with production characteristics meet the ecological requirements of the Russian desman: there are conditions for underwater burrowing operations and supply of matter and energy for the development of hydrobionts, which are the food resource for desman.
About the Authors
D. V. Ivanov
Research Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences
Russian Federation
Russian Federation
Kazan
I. I. Ziganshin
Research Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences
Russian Federation
Russian Federation
Kazan
E. V. Osmelkin
Prisursky State Nature Reserve
Russian Federation
Russian Federation
Cheboksary
V. N. Podshivalina
Prisursky State Nature Reserve;
Chuvash State University
Russian Federation
Russian Federation
Cheboksary
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Review
For citations:
Ivanov D.V., Ziganshin I.I., Osmelkin E.V., Podshivalina V.N. The Bottom Sediments as a Factor Affecting the Russian Desman Habitat Conditions in the Floodplain Lakes of the Sura River Basin. Proceedings of the Russian Geographical Society. 2022;154(1):48-60. (In Russ.) https://doi.org/10.31857/S0869607122010049
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