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1.
The qualitative and quantitative composition of free-living marine nematodes have been studied in Vostok Bay (Peter the Great Bay, Sea of Japan). It is found that the population density of nematodes in the bottom sediments of Vostok Bay shows an uneven distribution. The mean population density equaled 56800 ± 23400 specimens/m2. A correlation has been revealed between the population density of nematodes and the substrate type. Altogether, 85 species of nematodes have been found; they were dominated by Sabatieria palmaris, Rhabdodemania orientalis, Araeolaimus parvibulbosus, Oncholaimium paraolium, Doryolaimopsis peculiaris, and Metachromadora itoi. Six taxocenoses of nematodes were distinguished, taking into account the species dominating in the population density and using cluster analysis of the obtained data. The dominating trophic assemblage of nematodes was “scrapers.” In general, the species composition of nematodes in Vostok Bay is characterized by the relatively great similarity with that in other areas of Peter the Great Bay (Sea of Japan). 相似文献
2.
Seasonal dynamics of population densities and the qualitative composition of meiobenthos were studied in a strait between
Popova and Reineke islands in Amurskii Bay (Sea of Japan). Two peaks of population density were revealed: a spring-summer
peak and an autumn peak. No correlation was found between the depth, qualitative characteristics of the ground, and population
density of meiobenthos. 相似文献
3.
The species composition and population densities of foraminifera were studied in scallop farming grounds in Alekseev Bight
(Amurskii Bay, Sea of Japan). Ninety-one species of foraminifera were identified; members of the Elphidiidae, Discorbidae,
and Ataxophragmiidae were numerically dominant. When the scallop mariculture farm was in operation, the species composition
of foraminifera in farming grounds was impoverished and their population densities were an order of magnitude lower than at
more distant locations. Between 1988 and 1995, after the liquidation of the farm, the species diversity and population density
of foraminifera in farming grounds increased, while there was a general decline of the foraminifera population in the bay.
The highest density and species diversity of foraminifera occurred on coarse silty sand and small silty pebbles, and the lowest
species diversity was found on silty sediment. 相似文献
4.
I. A. Kashin A. Yu. Zvyagintsev S. I. Maslennikov 《Russian Journal of Marine Biology》2000,26(2):89-97
We studied the fouling of piers and quays in Amurskii and Pos’et bays, the Sea of Japan. The main fouling communities and
groupings were identified. They were usually dominated by bivalves, the musselMytilus trossulus and the oysterCrassostrea gigas. The exotic speciesBalanus improvisus was found to naturalize in the fouling on the hydrotechnical structures of the Amurskii Bay. The qualitative composition
of the fouling of the structures examined was compared using cluster analysis. 相似文献
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Omel'yanenko V. A. Kulikova V. A. Pogodin A. G. 《Russian Journal of Marine Biology》2004,30(3):159-174
Russian Journal of Marine Biology - The composition and seasonal dynamics of meroplankton in Amurskii Bay (Sea of Japan) were studied for the first time. The total survey period exceeded two years.... 相似文献
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The concentrations of iron, copper, zinc, manganese, cadmium, and mercury in tissues and organs of Pacific herring, Far Eastern navaga, and spotted flounder from Amurskii Bay, Sea of Japan, were determined using an atom-absorption method. The distribution of these elements has been studied in organisms of the fish. The greatest concentration of iron, copper, cadmium, and mercury is found in the liver of the fish, manganese is mostly accumulated in the bone tissue, and zinc is found in the skin. Some specific features of metal accumulation in the fish of Amurskii Bay have been revealed. For example, the concentration of iron in the liver of herring and flounder significantly increased the mean concentration known from other areas. A sanitary–hygienic evaluation is provided for the recent levels of metal concentrations in these three species of commercially important fish. 相似文献
9.
A formula to calculate the area of samples that would provide the necessary level of completeness for a species richness survey of a cenosis has been deduced. The model is based on a stochastic differential equation that describes random fluctuations in species abundance and on the assumption that a Poisson distribution of individuals in space occurs. The calculations are illustrated based on the example of the littoral polychaete taxocene in Vityaz Bay of Possiet Bay of the Sea of Japan. 相似文献
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O. N. Pavlyuk Yu. A. Trebukhova V. M. Shul'kin 《Russian Journal of Marine Biology》2003,29(6):341-347
The qualitative composition and distribution of the meiobenthos in Wrangel Bay (Nakhodka Bay of the Sea of Japan) depend on the bottom sediment grain composition and on the concentration of heavy metals in the ground. It was established that the meiobenthos in the bay was represented by 13 groups of animals (class, order) and was relatively evenly distributed. The nematodes dominated (50–80%), and their settlement density was slightly higher in silty ground than in silty–sandy ground. Forty-eight species of nematodes were found; Dorylaimopsis peculiaris, Viscosia stenostoma, Axonolaimus seticaudatus, Metasphaerolaimus japonicus, and Pseudosteineria inaequispiclata dominated in the silty–sandy sediments; Sabatieria pulchra, S. palmaris, Metalaimus pumilus, Sphaerolaimus limosus, and Oncholaimium ramosum dominated in the silty ground. A slightly expressed correlation of the settlement density with the ground type and lead concentration in the bottom sediments emerged for two species (S. pulchra and S. palmaris). 相似文献
13.
This paper studies the species composition and quantitative distribution of diatoms that belong to the genus Pseudo-nitzschia in the Russian waters of the Sea of Japan and the Sea of Okhotsk. In total, 11 species of this genus were found in the area, including 7 that are known as being potentially toxic. The highest concentrations of Pseudo-nitzschia microalgae (1.4 × 106–2.7 × 106 cells/L) were found in the summer and autumn in the Peter the Great Bay of the Sea of Japan and the lowest concentrations (2.5 × 102–1 × 104 cells/L) were found in the Sakhalinsky and Akademiya bays of the Sea of Okhotsk. The species diversity of potentially toxic diatoms was greatest (seven species) and the cell concentrations highest (over 6 × 105 cells/L) in the Peter the Great Bay, Sea of Japan, and in the Aniva Bay, Sea of Okhotsk. The density of potentially toxic species was highest near the northeastern coast of Sakhalin Island, in the Amur River estuary, and in adjacent waters. This paper also presents geographical distribution maps of Pseudo-nitzschia species and maps of the density distribution of potentially toxic microalgae over the studied area and identifies potential amnesic shellfish poisoning areas. 相似文献
14.
In Minonosok Bay, in a region of long-term industrial mariculture of mollusks, a steady biohydrochemical complex with increased organic matter content has been formed, in which the meiobenthos community was represented by a rather complete set of taxonomic groups of low population density. There were 16 groups (order, class) of the meiobenthos revealed, and the greatest population density was recorded in the central part of the bay under installations with suspended mollusks, (333000 ind./m2). Nematodes dominated in the eumeiobenthos; however, crustaceans prevailed in the bottom water layer and sediments at stations with increased oxygen content. Bivalves and gastropods dominated in the pseudomeiobenthos. Correlation analysis has revealed the dependence of the population density of the total meiobenthos and eumeiobenthos on the type of ground. There were 42 nematode species revealed; Axonolaimus seticaudatus, Enoplolaimus medius, Daptonema sp., Paracomesoma sp., and Oncholaimium paraolium dominated. Three nematode taxocens were discriminated by dominating species in the population density and results of cluster analysis of the data. Detritivorous nematodes prevailed in all types of ground. A correlation was found between the index of species diversity of nematodes and the content of organic carbon in the ground. 相似文献
15.
This study examines the seasonal dynamics of the activity of some antioxidant enzymes, the biotransformation enzyme glutathione-S-transferase, and levels of reduced glutathione and malondialdehyde in the liver of the flounder Liopsetta pinnifasciata from Amurskii Bay, Sea of Japan. The individual variability of biomarkers was fairly low. Significant sex differences were only found for superoxide dismutase. 相似文献
16.
O. N. Pavlyuk T. V. Preobrazhenskaya T. S. Tarasova 《Russian Journal of Marine Biology》2001,27(2):105-110
We performed a comparative analysis of the taxonomical composition and population density of the meiobenthos and substrate types of Alekseev Bight, Sea of Japan, throughout the period when a plantation for mariculture of Japanese scallop was exploited in the bight and for a decade after the plantation had been removed. We found that silting of substrates in the bight decreased and the number of taxonomical groups that constituted the meiobenthos increased. The nematodes that, earlier, dominated the meiobenthos in terms of population density were later exceeded by foraminiferans, the species diversity of which increased. Changes are revealed in the composition of the dominant species of these groups. 相似文献
17.
For the first time, year round and long-term seasonal research on the composition, phenology, and population dynamics of pelagic
larvae of bottom invertebrates were conducted in the Vostok Bay of the Sea of Japan. Larvae of 98 taxa of various ranks were
found. The larvae of bivalves and polychaetes were the most diverse. The larvae of bottom invertebrates occurred in plankton
year-round. Their density was at its minimum in January (less than 100 ind./m3), and its maximum from June to November (more than 1000 ind./m3). The larvae of polychaetes dominated in the autumn and winter seasons, whereas bivalve and gastropod larvae dominated in
the spring and summer seasons. It was shown that the proportion of pollution tolerant meroplankton larvae of the Polydora and Pseudopolydora genera was high in the Vostok Bay, and could indirectly indicate increasing anthropogenic pressure in the area. 相似文献
18.
O. N. Pavlyuk Yu. A. Trebukhova L. S. Belogurova 《Russian Journal of Marine Biology》2007,33(4):213-221
The effect of the Razdol’naya River on the littoral and sublittoral nematode community was studied in the innermost part of the Amursky Bay. Thanks to the seasonal abundance of juveniles of macrobenthic animals, pseudomacrobenthic species prevailed in the meiobenthos littoral community. Juvenile amphipods dominated (39.5%), the percentage of nematodes was 18.4% (45 species). The nematodes dominated in the meiobenthos community (65.7%, 71 species) at the sublittoral zone. The similarity of the species structure of littoral and sublittoral nematodes reached 36.5%. Low population density (2.6±1.7 thousand ind/m2) and poor species diversity of nematodes (7 species), the dominating form being Oncholaimium paraolium, were recorded at the littoral zone, which was subjected to direct riverine influence (1‰salinity). The correlation analysis revealed no relationship between salinity and population density of nematodes at the littoral zone. At the sublittoral zone (at stations of salinity less than 2.85‰) the parameters of population density (73.9±32.3 thousand ind/m2) and species diversity (12 species) of nematodes were the lowest, Parodontophora timmica dominated. A poor expressed dependence between the density of nematode populations and salinity was revealed. The correlation between the average size of ground particles and population density of nematodes was recorded. The greatest similarity of the species structure of littoral and sublittoral nematodes (26.67%) was recorded on gravel-sand bottoms. 相似文献
19.
The development of the diatomChaetoceros salsugineus from Amurskii Bay in the Sea of Japan was investigated in laboratory culture. It is shown that the intraspecific taxaC. salsugineus f.salsugineus, C. salsugineus f.curtus, andC. salsugineus f.solitarius correspond to particular stages in the development of this species in culture. Problems of the taxonomy and biology of this
species are discussed. It is assumed that the life cycle ofC. salsugineus includes a benthic stage represented by resting cells. 相似文献
20.
S. I. Kozhenkova 《Russian Journal of Marine Biology》2009,35(4):263-278
A general list of the flora of Vostok Bay (Sea of Japan) compiled on the basis of original and literature data includes 161
species, among them 25 green algae, 42 brown algae, 90 red algae, and 4 species of seagrass. In the period from 2000 to 2004,
114 species of macrophytes (19 green algae, 29 brown algae, 63 red algae, and 3 species of seagrass) were found in Vostok
Bay; 19 species of algae were first records for this bay. On the whole, the flora of Vostok Bay is dominated by warm-water
species, among which Asian low-boreal species occupy the leading position. The flora of Vostok Bay is changing under the influence
of global climatic and local anthropogenic factors. In recent years, there is a tendency for the proportion of warm-water
species to increase. The local anthropogenic influence on the flora of Vostok Bay has caused changes in the species composition
of plant communities. 相似文献