Begell House Inc.
Hydrobiological Journal
HYD
0018-8166
37
6
2001
The Ecological and Sanitary State of the Lybed River
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10.1615/HydrobJ.v37.i6.10
L. V.
Shevtsova
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine; Kyiv University of Management and Business
N. G.
Tkachuk
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
V. V.
Malafeyev
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
V. V.
Vasilkovskaya
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
The results of hydrochemical and microbiological studies of the Lybed river flowing through the center of Kiev are presented. The processes of transformation of organic contamination, and also of mineral forms of nitrogen, were studied. Water quality was assessed based on the ecological classification of the surface waters of land. The water of the Lybed river was assigned to the category of heavily contaminated waters.
Assessment of Cuproxyl Toxicity by the Method of Bioassay Using Cladocera
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10.1615/HydrobJ.v37.i6.20
E. P.
Shcherban'
National University of Bioresources and Nature Management, Kyiv, Ukraine
I. M.
Konovets
Institute of Hydrobiology
National Academy of Sciences of Ukraine
Kyiv, Ukraine
The toxicity of cuproxyl containing 10% CuSO4Ч5H2O, 10% aerosyl sorbent, and 80% water was studied by the method of bioassay using Daphnia magna Straus and Ceriodaphnia affinis Lilljeborg. The median lethal concentrations determined based on the results of acute experiments were 7.67 mg/L for Daphnia magna and 6.25 mg/L for Ceriodaphnia affinis. The toxicity threshold decreased with increasing the duration of exposure. The chronic lethal concentration of cuproxyl for Ceriodaphnia affinis (5 mg/L) caused the inhibition of reproduction of the test population in the third (III) and fourth (IV) generations. Under the action of sublethal concentrations of curpoxyl of 0.5 mg/L, 1.0 mg/L, and 2.5 mg/L the fecundity of Ceriodaphnia affinis decreased by 76.8%, 64.7%, and 58.0%, respectively.
Microbiological Studies of Water and Mucilaginous Biofilms in the Source of the Ob River in the Section Contaminated by Industrial Sewage
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10.1615/HydrobJ.v37.i6.30
G. P.
Polovinko
Institute of the Taxonomy and Ecology of Animals Siberian Department Russian Academy of Sciences Novosibirsk, Russia
In 1993-1994 in the source of the Ob river, the control waters were assigned to b-mesosaprobic zone, whereas the waters contaminated by industrial sewage were assigned to a-mesosaprobic zone. This fact suggests that the degree of purification of industrial sewage was insufficient. A high content of the main components of biofilms, including Geotrichum candidum and representatives of the order Mucorales, in the waters contaminated by industrial sewage suggests that industrial sewage significantly affects the development of biofilms.
Role of Picoplankton in Phytoplankton Communities of Freshwater Ecosystems (an Overview)
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10.1615/HydrobJ.v37.i6.40
T. M.
Mikheyeva
Belarusian State University, 4, Nezavisimosti Av., 220030 Minsk, Belarus
Ye. V.
Lukyanova
Scientific Research Laboratory of Hydroecology Belorussian State University Minsk, Belarus
During a year, the contribution of autotrophic picoplankton to the total numbers of cells and organisms of phytoplankton varies over a wide range. It accounts for 2-98% and 24-96%, respectively. The contribution of autotrophic picoplankton to the total numbers of phytoplankton during November - April is higher than that registered during the vegetation season (from May till October). The contribution of autotrophic picoplankton to the total biomass of phytoplankton, provided that the cell mass is 2 Ч10-9 mg, is not high (0.4-4.2%). From November till April, it is somewhat higher (3.8-24.7%). Unlike the absolute values of development of autotrophic picoplankton, its relative values do not correlate with the trophic level of the studied water bodies.
Epiphytic Ciliata of the Dnieper Reservoirs
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10.1615/HydrobJ.v37.i6.50
A. A.
Koval'chuk
Uzhgorod National University Uzhgorod, Ukraine
The species composition, distribution, quantitative development, and functional activity of epiphytic Ciliata occurring in the Dnieper reservoirs were studied. The samples of epiphytic Ciliata were taken from 12 species of higher aquatic plants. Based on literature and original data, it was inferred that epiphytic Ciliata are of minor importance in transformation of organic matter.
Changes in the Structure of Phytoplankton under the Influence of Urea
13
10.1615/HydrobJ.v37.i6.60
T. F.
Shevchenko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Heavy pollution of water by urea results in essential changes in the structure of phytoplankton. Cyanophyta proved to be most sensitive to the influence of high concentrations of ammonium. The quantitative indices of development of Cyanophyta decreased, whereas the numbers and biomass of Chlorophyta, primarily of Volvocales, increased with increasing the content of NH4+, ions in water.
Dynamics of the Content of Different Forms of Nitrogen in the Medium Used for Intensive Cultivation of Chlorella
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10.1615/HydrobJ.v37.i6.70
Data on dynamics of the content of ammonium, nitrate, and nitrite in the A-5 and Tamiya nutrient media used for extensive, semi-periodic, and intensive cultivation of Chlorella are presented. Based on the results obtained, it has been concluded that the culture of Chlorella possesses unique adaptive reactions allowing the uptake of all forms of nitrogen available in the medium in sufficient amounts.
Regularities of the Functioning of Bacteria of the Kremenchug Reservoir
13
10.1615/HydrobJ.v37.i6.80
L. Ye.
Mikhaylenko
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
L. I.
Bagnyuk
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Specific stages of succession of bacterioplankton were revealed as a result of long-term investigations. Each of these stages was conditioned by the influence of appropriate abiotic and biotic factors. The stages revealed were characterized by certain structural and functional indices. The main regularities of decomposition of organic matter in bottom sediments were determined. During the period of intensive anthropic load their enzymatic activity is a reliable indicator of the capacity of the bed of the reservoir for self-purification.
Microorganisms of Fouling of Anionite of Water Treatment Setups of Thermal Power Stations
12
10.1615/HydrobJ.v37.i6.90
A.
Sventetskiy
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
G. N.
Oleynik
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Morphological forms of microorganisms found in the fouling of anionite of water treatment setups of thermal power stations are described. They include algae, Protozoa, iron bacteria, various rods, and filamentous forms of microorganisms. It has been found that the density of bacteria on a particle of anionite with the area of 0.549 mm2 accounts for 34-44 thousand cells.
Dynamics of the Content of Nutrients and Organic Matter in Some Tributaries of the Dnieper River Depending on the Development of Phytoplankton
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10.1615/HydrobJ.v37.i6.100
T. A.
Vasilchuk
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Seasonal dynamics of the content of nutrients and organic matter were studied in some tributaries of the upper reaches of the Dnieper river depending on the intensity of development of phytoplankton. The results obtained make it possible to predict changes in the hydrochemical and hydrobiological regime of watercourses.
Peculiarities of the Heterotrophic Activity of Bacterioplankton in the Estuary of the Neva River (Neva Bay and the Eastern Part of Finish Bay)
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10.1615/HydrobJ.v37.i6.110
V. G.
Drabkova
Institute of Limnology Russian Academy of Sciences, St. Petersburg, Russia
Z. G.
Kaurova
Institute of Limnology Russian Academy of Sciences, St. Petersburg, Russia
N. L.
Khlopotina
Institute of Limnology Russian Academy of Sciences, St. Petersburg, Russia
In September 1994 and 1995, and also in September and October 1996, Neva Bay and the eastern part of Finish Bay were studied with the aim of determining the quantitative indices of bacterioplankton and its activity. This area of water, with the exception of coastal sections and some bays, was characterized by insignificant development of phytoplankton. At the same time, the intensity of heterotrophic microbiological processes responsible for self-purification of water was rather high. This phenomenon was registered even in October at a low temperature of water.
Contents for 2001
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10.1615/HydrobJ.v37.i6.120