Begell House Inc.
Hydrobiological Journal
HYD
0018-8166
42
4
2006
Ciliata, Other Protozoa, and Microinvertebrates of Floodplain Water Bodies of the Dnieper Reservoirs
3-36
10.1615/HydrobJ.v42.i4.10
A. A.
Koval'chuk
Uzhgorod National University Uzhgorod, Ukraine
A total of 227 taxa of free-living Ciliata was found in floodplain water bodies of the Dnieper reservoirs in 1982−1985. It has been found that pH of water essentially influences the quantitative indices of plankton Ciliata development. The highest quantitative indices of Ciliata development were observed in summertime in the water bodies of the first group. To specify the classification of the studied water bodies, the discriminant analysis of the quantitative indices of development of microinvertebrates of 6 groups was used. Nematoda and Rotatoria dominated in terms of the quantitative indices of their development. Among protozoo- and microzoobenthos, Ciliata predominated in terms of their functional significance. Ciliata, and Copepoda predominated in terms of their functional significance in periphyton.
Epiphyton Algae Groups of Potamogeton crispus L. within the River Section of the Kanev Reservoir
37-44
10.1615/HydrobJ.v42.i4.20
O. S.
Tarashchuk
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Phytoepiphyton of Potamogeton crispus L. occurring in the main riverbed, and also in additional water bodies, of the river section of the Kanev reservoir was studied for the first time. Bacillariophyta dominated in terms of their numbers and biomass. Cocconeis placentula dominated in the main riverbed, Melosira varians - in Obolon Bay, whereas Staurosira construens - in the Desenka river. The total numbers and biomass of phytoepiphyton, and also the complex of dominant species, depended on the speed of water flow. The quantitative indices of phytoepiphyton development increased with decreasing the speed of water flow. Autochthonous organisms dominated over autochthonous organisms in terms of their species composition, numbers, and biomass.
Present-Day State of Macrophytobenthos of Shelf Zones of the Black Sea (Southeastern Crimea)
45-51
10.1615/HydrobJ.v42.i4.30
N. S.
Kostenko
Karadag Nature Reserve, National Academy of Sciences of Ukraine, Kurortne, Autonomous Republic of Crimea, Ukraine
Ye. A.
Dikiy
Karadag Nature Reserve, National Academy of Sciences of Ukraine, Kurortne, Autonomous Republic of Crimea, Ukraine
A. A.
Zakletskiy
National University "Kyiv-Mohyla Academy", Kyiv, Ukraine
Based on the analysis of samplings obtained at the depths 0.5−15 m, the description of macrophytobenthos in the southeastern coastal zone of Crimea is given. It is shown that autochthonous oligotrophyc plant communities are persisted in the area of Karadag although they are partially transformed because of anthropogenic eutrophication. Original oligotrophyc phytocenoses are preserved also in some places of Feodosiya Bay, the aquatic area subjected to high anthropogenic impact. Currently, maximally undisturbed native phytocenoses still occur near the Meganom Peninsula that may be considered as a standard.
Peculiarities of Plankton of Lake Chany (the Western Siberia, Russia)
52-61
10.1615/HydrobJ.v42.i4.40
V. I.
Yermolayev
Central Siberian Botanical Gardens, Siberian Branch of the Russian Academia of Sciences, Novosibirsk, Russia
L. S.
Vizer
"Gosrybtsentr" Department, Western-Siberian Scientific and Research Institute of Aquatic Bioresources and Aquaculture, Novosibirsk, Russia
Lake Chany represents a large natural plain water body with a high water salinity located in the Southwestern Siberia. A total of 230 species of phytoplankton and 122 species of zooplankton was found in the lake. Lake Chany includes five connected sections differing in the degree of water salinity. The species composition of plankton, its numbers, biomass, and production were studied in each section of the lake. It has been found that water salinity is one of the main ecological factors influencing the development of plankton in Lake Chany. The increase in the degree of water salinity is accompanied by a decrease in the species diversity of phyto- and zooplankton, and also by changes in their numbers and biomass.
Peculiarities of the Response of Plankton Algae to the Substances Extracted from the Rhizome of Nuphar lutea (L.) Smith
62-73
10.1615/HydrobJ.v42.i4.50
T. F.
Shevchenko
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
It has been found that the water soluble substances of the rhizome of Nuphar lutea (L.) Smith essentially influence the growth of plankton algae, and also their photosynthetic and nitrate reductase activity. As a consequence, the indices of water quality, and also the structure of phytoplankton communities, significantly change. In this case, the quantitative indices of plankton algae development, primary of Cyanophyta, and their species diversity decrease.
Trophic Structure of a Microbial Community in a Small River
74-81
10.1615/HydrobJ.v42.i4.60
N. G.
Kosolapova
Institute of Biology of Inland Waters, Russian Academy of Sciences, Borok, Russian Federation
Z. M.
Mylnikova
Institute of Biology of Inland Waters, Russian Academy of Sciences, Borok, Russian Federation
D. B.
Kosolapova
Institute of Biology of Inland Waters, Russian Academy of Sciences, Borok, Russian Federation
Seasonal dynamics of abundance, species diversity, and trophic structure of the protozoan community, as well as seasonal variations of quantitative characteristics of bacterioplankton were investigated in different sections of the Latka River (a small tributary of the Rybinsk Reservoir on the Volga, Yaroslavl Region). It was demonstrated a clear influence of environmental differences on trophic interrelations already within different sections of that small river.
On the Mechanism of Action of Easily Oxidizable Phenols on Photosynthetic Activity of Algae
82-92
10.1615/HydrobJ.v42.i4.70
Absorption of exogenous oxidized polyphenols by algal cells is responsible for changes in their photosynthetic activity. Under conditions of subacidic reaction of cytoplasm, quinones are reduced at the expense of hydrogen ions formed as a result of water photolysis in the photosystem II. Cyclic and non-cyclic photophosphorylation is inhibited under such conditions. The algal cell becomes energetically exhausted. The photosynthetic activity of blue-green and green algae is inhibited at different concentrations of quinones dissolved in water.
Principles of Methods for the Assessment of the Ecological Status of Water Bodies using Microphytobenthos
93-106
10.1615/HydrobJ.v42.i4.80
Approaches to the use of microphytobenthos to estimate the ecological status of water bodies are presented. It is suggested that the taxonomic and ecomorphological structure and quantitative parameters of microphytobenthos communities are feasible to use for ecological assessment of water bodies.