Begell House Inc.
Hydrobiological Journal
HYD
0018-8166
40
6
2004
Influence of Environmental Conditions on Hatching Activity of Youth from Dormant Eggs of Polyphemus pediculus L.
13
10.1615/HydrobJ.v40.i6.10
L. G.
Butorina
Institute of Biology of Inland Waters of Russian Academy of Sciences, Borok, Yaroslavl' Region
The duration of period of development of resting eggs of P. pediculus, the rate and intensity of hatching and numbers of youth depend on the depth of location of resting eggs in the reservoir and ecological conditions during the period of rest of the population. The degree and the character of influence of the environmental factors over the viability of eggs and hatching of youngs are determined by the duration of cryptobiosis, the types of anabiosis, its duration, temperature and illumination.
Anthropic Changes in the Plant Cover of the Lakes Located within the Territory of the Cities of the Masurian Lakeland
21
10.1615/HydrobJ.v40.i6.20
G.
Checherska
Warmin-Masurian University, Olshtyn, Poland
Vegetation of 14 urban Masurian lakes was investigated. The method of macrophytoindication based on the structural and spatial analysis of vegetation of the littoral zone of the studied lakes made it possible to assess the extent of changes in their ecosystems in response to natural succession and anthropic load. It has been found that the value of phytocenotic diversity is the main parameter indicative of natural succession, whereas the index of synanthropization is indicative of anthropic changes in vegetation. The studied lakes were classified using the method of macrophytoindication.
Composition and Distribution of Zooplankton of the Cooling Pond of the Khmelnitsk Nuclear Power Station
10
10.1615/HydrobJ.v40.i6.30
Zooplankton of the cooling pond of the Khmelnitsk NPS was studied in summer 1999 and 2001. Data on the quantitative indices of development of zooplankton, on its species composition and distribution in the cooling pond are presented. It has been found that the distribution of zooplankton communities in the cooling pond was non-uniform.
Structure and Distribution of Meiobenthos in the Region of Methane Gas Seeps from the Black Sea Bottom
9
10.1615/HydrobJ.v40.i6.40
N. G.
Sergeyeva
Institute of Biology of Southern Seas National Academy of Science of Ukraine, Sevastopol, Ukraine
The taxonomic composition and numerical distribution of meiobenthos in the Black Sea gas seeps region to the southwest from the Crimean Peninsula were studied. The pattern of vertical distribution of meiobenthos along the O2/H2S gradient and its stratifications within the bottom ground testify to a wide diversity (representatives of 13 high-rank taxa) and intense quantitative development of meiobenthos at depths of 77−232 m. It is concluded that the environmental conditions, in particular, gas conditions formed around methane seeps, enable the adaptation of meiobenthos and promote its development.
Macrozoobenthos of the Upper Reaches of the Kakhovka Reservoir under Conditions of the Influence of a Large Industrial Complex
9
10.1615/HydrobJ.v40.i6.50
K. O.
Dombrovskiy
Zaporozhye National University Zaporozhye, Ukraine
T. A.
Kharchenko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
The modern ecological state of the canals of the upper reaches of the Kakhovka reservoir was assessed as a result of the study of biodiversity and structural indices of macrozoobenthos, and also as a result of bioindication of water quality.
Changes in the Structure of Macrozoobenthos of the Cooling Pond of the Chernobyl NPS in Response to a Decrease in the Thermal Load on its Ecosystem
9
10.1615/HydrobJ.v40.i6.60
N. S.
Severenchuk
Kiev National University; Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Results of long-term studies on the structure of macrozoobenthos of the cooling pond of the Chernobyl NPS were generalized. Changes in the species composition and quantitative indices of development of communities of benthic invertebrates were analyzed. It has been found that the species diversity and numbers of macrozoobenthos of the cooling pond increased as a result of the processes of ecological succession.
Assessment of the Ecological State of Reservoirs by Bacteriobenthos Criteria
7
10.1615/HydrobJ.v40.i6.70
N.
Dzyuban
Institute of Biology of Inland Waters of Russian Academy of Sciences, Borok, Russia
Data of long-term microbiological studies of bottom deposits of Upper Volga reservoirs are presented. The features of changes in structural and functional characteristics of bacteriobenthos in certain areas have been revealed. These features depend on physicochemical properties of water, bottom deposits, and the ecological state of water bodies as a whole.
Influence of the Rezina-Rybnitsa Industrial Complex on the Content of Mercury (II), Copper (II), Lead (II), and Cadmium (II) in the Dubossary (Dubasari) Reservoir of the Dniester (Nistru) River
17
10.1615/HydrobJ.v40.i6.80
G. G.
Muntyanu
Institute of Chemistry of the Academy of Sciences of Republic of Moldova
V. I.
Muntyanu
Institute of Chemistry of the Academy of Sciences of Republic of Moldova
The contents of mercury (II), copper (II), lead (II), and cadmium (II) in abiotic components of the environment (water, suspended matter, bottom deposits) of the Dubossary (Dubasari) Reservoir on the Dniester (Nistru) River, Republic of Moldova, was studied in 2000−2001. It has been demonstrated that the maximal concentrations of the metals under study were in the area comprising the Rezina−Rybnitsa industrial complex that produces 4.4 million tons of cement and 0.7 million tons of metal annually. In this area, the contents of studied metals in the soil exceed the background level 2−11 times. The metals are transferred into the reservoir in the dissolved and suspended forms with atmospheric precipitate.
Algicidic Properties of Polyphenols Depending on Their Molecular Structure
9
10.1615/HydrobJ.v40.i6.90
A. I.
Dakevich
Institute of Hydrobiology National Academy of Sciences of Ukraine, Kiev, Ukraine
Interrelations of the structure of polyphenols and their biological activity with respect to cyanobacteria and algae were under study. It has been found that polyphenols with hydroxyl groups in o- and p-positions possessing reductive properties are toxic to cyanobacteria. Oxidation of polyphenols to appropriate quinones is registered not only in the presence of polyphenol oxidase, but also in the sterile distilled water at pH 7.0.
Alkaloids of Nuphar lutea (L.) Smith. and their Influence on the Vital Activity of Cyanobacteria and Algae
13
10.1615/HydrobJ.v40.i6.100
O. V.
Balanda
Institute of Hydrobiology National Academy of Sciences of Ukraine, Kiev, Ukraine
V. A.
Medved'
Institute of Hydrobiology National Academy of Sciences of Ukraine Kyiv, Ukraine
Nuphar lutea (L.) Smith. is the most typical representative of higher aquatic plants capable of producing metabolites of alkaloid nature. In the rhizome of N. lutea, the contribution of these substances to the absolutely dry mass of the plant was 2.7%. Some amount of these biologically active substances is excreted into the aquatic environment. Alkaloids in association with other exogenous metabolites are capable of inhibiting the development of Cyanobacteria and other representatives of Procaryota. They influence the formation of specific algal and bacterial communities. The method of chromato-mass-spectrometry made it possible to establish that the complex of biologically active substances isolated from the rhizome of N. lutea consists of 14 components. In this case, 6 of them belong to alkaloids. Their contribution to the total mass of the substance was 41.97%. Results of experimental studies of the influence of alkaloids of N. lutea on the nitrate reductase activity of Cyanobacteria and algae are presented.