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1.
Long-standing variations in the structure of bottom sediments within typical habitats of the aquatic life are characterized using the Volzhskii Pool of the Rybinsk Reservoir as an example. The role of hydrodynamic processes of the littoral zone in the formation of the ground complex of shallow water areas of the pool is discussed. The trends in variation in the quality of bottom substrate in fish habitats are analyzed. The peculiarities of long-standing variations in the distribution of types of bottom sediments in the entire reservoir are shown. 相似文献
2.
Water Resources - New data on the contents of plant pigments and organic matter in bottom sediments of channel, floodplain and estuarine biotopes of the Gorky Reservoir (upstream Volga, Russia) are... 相似文献
3.
Relationships between the principal characteristics of benthic communities, physical characteristics of soil, depth, current rate, and the concentration of pollutants in the soil and water of the Gorky and Cheboksary reservoirs are investigated. Numerous significant correlations are found to exist between these characteristics. It is recommended that the assessment of water quality by characteristics of benthic communities should be made with a great caution. 相似文献
4.
Accumulation of Polychlorinated Biphenyls in the Sheksninskii Pool of the Rybinsk Reservoir 总被引：1，自引：0，他引：1
Specific features of polychlorinated biphenyl (PCB) distributions in bottom sediments, benthos, and fish of the Sheksninskii Pool of the Rybinsk Reservoir are discussed. It is shown that 95% of the total PCB is accumulated in bottom sediments. Mapping of PCB-polluted bottom sediments with allowance for the sediment type and bed relief is proposed. The obtained data along with coefficients of accumulation in the bottom sediments–benthos–fish chain were used to evaluate the maximum concentration of PCB in bottom sediments at which the environmental risk of fish metabolism disturbance will be minimum. It is shown that once the PCB discharge into the water body is completely eliminated, their presence in the system will still be an ecological hazard for 25–30 years. 相似文献
5.
Kurazhkovskii A. Yu. Kurazhkovskaya N. A. Klain B. I. Zakonnov V. V. 《Water Resources》2002,29(5):506-509
Physical properties of cores taken from sediments in the channel zone of the Volga Stretch in the Rybinsk Reservoir are studied. The physical properties of the sediments are shown to be related to the evolution of geomorphological processes and the amount of organic matter in the sediment. Variations in the physical properties were used to recognize synchronous formation of sediment horizons corresponding to certain formation stages of the reservoir soil complex and anomalous environmental and climatic events. Three stages of channel sedimentation are established based on characteristic behavior of magnetic parameters and organic matter content. The magnetic parameters of sediments are shown to allow data reconstruction on some environmental and hydrological processes. 相似文献
6.
Water Resources - First data on the concentrations of plant pigments in the top layer of bottom sediments are given for a large, shallow, moderately overgrown by macrophytes (21.5%) the Kostromskoe... 相似文献
7.
The results of studies of the vertical distribution of SP (the sum of chlorophill a and pheopigments) and the rate of silting of the Rybinsk Reservoir since its filling in 1941 up to 2009 are studied. The range of pigment concentrations (7–232 μg/g of dry residue) in core sample layers includes the values typical of all types of trophic conditions of water bodies, but the majority of values (81%) refers to the categories of mesotrophic and eutrophic. The mean concentrations of pigments in core samples over the periods between soil surveys, which were carried out in 1955, 1978, 1992, and 2009, averaged 525.4, 248.8, 200.6, and 142.3 mg/(m2 year), respectively. The mean rates of silting at the stations under study decreased from survey to survey from 13.6–17.9 to 3.5–5.3 mm/year. A direct positive relation was found to exist between the mean annual concentrations of pigments in core samples and the rate of silting at higher values of the indices in lakelike reaches in comparison with river-type reaches. 相似文献
8.
Bioassay methods are used to assess the toxicity of bottom sediments in the main watercourses of the Selenga River basin and Lake Orog in Mongolia. Toxic bottom sediments are found in a brook in the region of the Erdenet Mining and Concentration Complex, as well as in the Eroo and Bukhlyn rivers, which experience the effect of intense gold mining. The conclusion is drawn that the Selenga River water flowing from the territory of Mongolia cannot directly affect the quality of water in Lake Baikal. 相似文献
9.
Water Resources - The paper describes a method of graphical analysis developed for freshwater ecosystems. The method was first used to analyze the structure of phytoplankton communities in the... 相似文献
10.
Water Resources - The physicochemical characteristics of bottom sediments in inland water bodies in the Central and Southern Vietnam are presented for the first time, including particle-size... 相似文献