Begell House Inc.
Hydrobiological Journal
HYD
0018-8166
35
4
1999
The Role of Biota in Release of Nutrients from Bottom Sediments into Water (Review)
1-17
10.1615/HydrobJ.v35.i4.10
T. V.
Zhukova
Scientific Research Laboratory, The Belarus State University Minsk, Belarus
The article presents a review of methods and main results of investigations on the influence of biota on the early diagenesis of deposits, as well as onnutrient exchange between bottom sediments and the water column. Mechanisms and factors determining the exchange rate are discussed. The effect of biotic factor is of great importance, especially in littoral zones and shallow lakes.
Successions and Main Stages of Phytoplankton Formation in the Kremenchug Reservoir
18-24
10.1615/HydrobJ.v35.i4.20
V. I.
Shcherbak
Institute of Hydrobiology, National Academy of Sciences of Ukraine, 12 Prosp. Geroev Stalingrada, Kyiv 04210, Ukraine
Long-term research data (1960-1994) on structural and functional characteristics of phytoplankton in the Kremenchug reservoir have been analyzed in the retrospective aspect. Literature data, as well as original information obtained by the author, are used in this publication. Five stages of ecological succession and three types of phytoplankton formation in the reservoir were distinguished. They are related mainly to the changes in the role of phytoplankton in the Dnieper cascade in the course of building reservoirs (transformation of the formerly head Kremenchug reservoir into an intra-cascade reservoir). Autogenic succession is the main type of successions; it is determined by the bioproductional activity of phytoplankton.
Long-standing Changes in Species Diversity and Structure of Zooplankton in Taganrog Bay (Sea of Azov)
25-38
10.1615/HydrobJ.v35.i4.30
Ye. M.
Partaly
“Iliana” State Enterprise Mariupol, Ukraine
Changes in the species diversity and numbers of zooplankton in Taganrog Bay (Sea of Azov) during the period 1971−1991 are discussed.
Light-dependent Changes in Physiological Indices and Behavior Activity of the Rainbow Trout Salmo irideus
39-44
10.1615/HydrobJ.v35.i4.40
V. N.
Radchenko
Institute of Biology of the Southern Seas, National Academy of Sciences of Ukraine, Sevastopol, Ukraine
M. Yu.
Aleyev
Institute of Biology of the Southern Seas, National Academy of Sciences of Ukraine, Sevastopol, Ukraine
Changes in secretory activity of the pineal organ resulting from the rainbow trout (Salmo irideus) exposition under different lighting regimes (L:D − 12:12; 24:0; 0:24) were analyzed as the mechanisms caused variations in skin pigmentation, leukocyte formula, rates of somatic growth, degree of gonad maturation, as well as in manifestation of schooling, and rheotaxis. These experiments have definitely shown the role of pineal organ in regulation of fish individual life cycle.
Fish Viability during Ontogenesis in Dependence on pH of the Aquatic Environment
45-52
10.1615/HydrobJ.v35.i4.50
S. V.
Kruzhilina
Institute of Fishery, Ukrainian Academy of Agrarian Sciences, Kyiv, Ukraine
V. P.
Bil'ko
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Original and literature data about survival of fish embryos, larvae, fries, fingerlings and adults in dependence on pH of the environment are summarized. Basing on the obtained results, the optimal, suboptimal, and lethal pH limits were determined for fish.
Peculiarities of the Crucian Carp Lipid Metabolism at Multiple Spawning in Regulated Aquatic Systems
53-58
10.1615/HydrobJ.v35.i4.60
M. V.
Malinovskaya
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
V. A.
Klekot
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
Some indices of the crucian females lipid metabolism (total lipids, triacylglycerins, free fatty acids) were studied at multiple spawning in regulated aquatic systems. Dependence of these indices on the breeding temperature of females was determined, as well as influence of the two-week "wintering" on the lipids, triacylglycerins and free fatty acids accumulation in liver, gonads, and blood. The analysis of total lipids, triacylglycerins and free fatty acids in tissues of spawned and non-spawned females was performed. The relation with ichthyological indices was also established.
Cadmium in Surface Waters: the Contents, Form of Presence, Toxic Effect
59-77
10.1615/HydrobJ.v35.i4.70
I. V.
Iskra
Institute of Hydrobiology, National Academy of Sciences of Ukraine, Kiev, Ukraine
On the base of the literature materials and author's original research, a review of information about the contents, forms of migration, distribution regularities, and toxicity of cadmium compounds in natural surface water is presented.
Mathematical Modelling of Nitrogen Circulation in Freshwater Ecosystems
78-95
10.1615/HydrobJ.v35.i4.80
V. A.
Dobrynskiy
Institute of Hydrobiology of National Academy of Sciences of Ukraine, Kyiv, Ukraine
I. V.
Rogal
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine
A mathematical model of nitrogen circulation inside a freshwater ecosystem is proposed. The model consists of seven components. They are: water soluble organic and inorganic nitrogen compounds, nitrogen of detritus, nitrogen of phytoplankton and three types of bacterial nitrogen. Using this model, special features of nitrogen circulation inside oligotrophic lakes and other freshwater oligotrophic reservoirs are studied. It is shown that in the given case processes of biotransformation of nitrogen substances, which are connected with phytoplankton and bacteria, run independently one from another.
Parasitological study of Epischura baicalensis (Crustacea: Temoridae) in Lake Baikal
96-110
10.1615/HydrobJ.v35.i4.90
O. T.
Rusinek
The Baikal Museum, Siberian Branch of the Russian Academy of Ssciences, Listyanka, Russia
M. P.
Bakina
Limnology Institute, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia
A. N.
Nikolskiy
Limnology Institute, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia
During the years 1991−1992 the natural infestation of a Baikalian plankton crustacean Epischura baicalensis by procercoids of the genus Proteocephalus was analyzed. It was stated that the infestation by proteocephalus can occur starting from the third copepodite stage on. The general annual infectivity of E. baicalensis by procercoids is 0.1334 %. The most infested were females of Epischura (0.3891 %), the third copepodite stages were least invaded (0.0038 %). The average number of procercoids of the genus Proteocephalus in the Baikal is 2.7 individuals/m3. The data are reported on the yearly infestation dynamics, and dimensions of some body parts of the proteocephalus procercoids. The life span of parasites in the winter-spring generation of Epischura is 8−9 months, and 10 months in the summer crustacean generations.
Trematodes of Some Species of Small Freshwater Bivalved Mollusks from the Mouth of the Desna River
111-115
10.1615/HydrobJ.v35.i4.100
In three species of small freshwater clams (superfamily Pisidioidea) which are common in the mouth of the Desna River, seven species of trematodes (families Allocreadiidae, Gorgoderidae, Echinostomatidae) parasitize. These freshwater mollusks are hosts for rediae, cercariae, and metacercariae of the trematodes investigated. Seasonal changes of invasion were ascertained. Cases of combined invasion by two trematode species in the same host were registered.
Study of Water Filtration Rate by Baikal Sponge, using Radiocarbon Method
116-118
10.1615/HydrobJ.v35.i4.110
D. I.
Stom
Scientific-Research Institute of Biology Irkutsk State University Irkutsk, Russia
T. A.
Gil'
Research Institute of Biology, Irkutsk State University, Irkutsk, Russia
T. F.
Kazarinova
Research Institute of Biology Irkutsk State University, Irkutsk, Russia
The data of laboratory experiments with Baikal sponge, Lubomirskia baicalensis, are presented. The filtration rate was registered not only for samples taken from different individuals, but also for fragments of the same individuals, depending on their physiological state and exposition rate.
Some Aspects of Interaction of Unio tumidus and Unio pictorum (Bivalvia, Unionidae) Populations with their Parasites and Commensals
119-122
10.1615/HydrobJ.v35.i4.120
The effects of Unionidae bottom settlement composition on the indices of invasion by Aspidogastrea and Ciliata have been studied. Some peculiarities of functioning of the "parasite-host" system, provided that the strict host-specificity of parasite is absent, are shown.