Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 16

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1

Water level forecast for the Pomeranian Bay from the hiromb model

100%
Kalas M., Staskiewicz A., Szefler K.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
39-57
EN
Water level 48-hour forecast data for the Pomeranian Bay, obtained from the operational model ?HIROMB?, have been compared with the coastal water level records. The gauges of Mrzezyno, Dziwnow, Koserow and Sassnitz as well as 0-24 hours and 24-48 hours forecast for the appropriate grid nodes have been analysed. An overview of different statistical criteria has been done. The statistical analysis has shown a satisfactory agreement between the forecast and observed data. However, the problem of the common reference level for the all gauges remains still unsolved.
2

Water cooling, ice formation and some physical properties of sea ice in Puck Lagoon

100%
Urbanski J. A.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
87-98
EN
In Puck Lagoon the net long-wave radiation is the dominant heat flux causing water to cool during winter. Ice formation depends mainly on wind conditions. Since the temperature of Puck Lagoon ice is almost always higher than ?8?C, solid salt crystals are not present in the ice. The mean salinity of the sea ice is 1.57 psu with a maximum of 4.84 psu. The ice porosity ranges from 0.3% to 7.7% and strongly influences the thermal conductivity of the sea ice in Puck Lagoon. Puck Lagoon is situated in the shallow western part of the Gulf of Gdansk and is about 100 km2 in area. The mean depth is 3.5 m and the salinity can approach 8 psu. The total range of the instantaneous water level is about 1 m. Sea ice forms in Puck Lagoon every year. From 1950 to 1990 there was ice cover on an average of 60-80 days (Szefler 1993). Long periods of fast ice (about 70 days) are typical in this area. The mean date of the first ice in the lagoon is 15 December. The thickness of this first ice increases until March, the average maximum thickness being about 30 cm.
3

Nutrient status in the Szczecin Lagoon - past, present and future prospects

100%
Pastuszak M., Wielgat M., Sitek S.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
59-86
EN
Nutrient concentrations and their annual/interannual variability in the Szczecin Lagoon are shaped by variable riverine water/nutrient discharges and bio-geochemical processes in the Lagoon which modify the dissolved/suspended matter introduced. On an interannual scale, nitrate and phosphate concentrations in the Lagoon in 1969-97 displayed quite considerable variability, with maxima of NO3 coinciding with minima of PO4 concentrations. Both NO3 concentrations in the Lagoon and total nitrogen loads showed a strong positive correlation with the water volumes discharged (r = 0.73 and 0.82, respectively). This dependence was much weaker and negative for PO4 (r = - 0.51), and weak and positive for total phosphorus loads (r = 0.35). It would appear, therefore, that in the catchment area of the Oder River, nitrogen sources are mainly diffuse, while phosphorus is derived from point sources. There was a considerable predominance of nitrates in the inorganic nitrogen pool, but the presence of ammonium in large concentrations in winter and summer was also evident. Among the inorganic nutrient species, nitrates exhibited the highest transformation rate into organically bound forms (over 60%) while passing through the Lagoon. The mechanisms responsible for the nutrient transformation patterns in the Lagoon - temperature, in particular - are discussed in the paper. Phytoplankton production in the Lagoon appeared to be phosphorus-limited in spring and nitrogen-limited in summer.
4

Monitoring of the cardiac activity of the Baltic isopod Saduria entomon exposed to hypoxia, using non-invasive, computer-aided techniques

100%
Miac J.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
115-124
EN
The repertoires of physiological responses which invertebrates possess play a major role in determining their distribution and survival potential. In the present study the effect of severe hypoxia on the heart rate of S. entomon has been investigated. Saduria entomon are often exposed to extended periods of severe hypoxia and anoxia in their natural habitats. The animals were exposed to conditions of a reduced level of oxygen (< 10% O2 saturation) for 24 hours. The experiment confirms that the pattern of their heart rate changed considerably with time and experimental condition. Under hypoxic condition a steady, regular heart rate was observed and the variability of beat rate decreased in comparison with normoxic one. The mean heart rate of the unburied animals in normoxia was higher than that of the buried S.entomon with considerably lower inter-individual variability. The mean heart rate of animals in hypoxic conditions was similar for all individuals (41.66 ? 2.03 (mean ? SD)), but not significantly different in normoxic conditions (Student t-test, p > 0.05).
5

Halotolerance phenomena in Synechocystis sp. from the North Sea

100%
Mishra S., Krumbein W. E., Palinska K. A.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
3-12
EN
Microorganisms modify their biochemical composition in response to environmental factors, including nutrient availability, light, temperature and salinity. This research was carried out in order to establish ways of modifying the biochemical composition of marine cyanobacteria through the optimization of environmental parameters e.g. light, temperature and salinity. The effect of salinity stress in combination with variable temperature and light intensity was studied on Synechocystis sp., strain Ol 86, isolated from the North Sea. In nature, all microorganisms are exposed to different factors. Hence, we considered all the essential factors together in different groupings. Experiments were conducted at three different temperatures, two different light intensities and four different salinities. The influence of these factors on the growth and physiology of cyanobacteria from a microbial mat of the North Sea is reported.
6

Studies on the formation and disintegration of grounded ice hummocks in sheltered areas of the southern Baltic coast

100%
Girjatowicz J. P.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
3-16
EN
Certain ice-related processes and phenomena associated with formation and disintegration of grounded ice hummocks in sheltered areas are discussed. The descriptions and discussion are based on the author?s research carried out over many years in the southern Baltic coastal lagoons. The first part of the paper focuses on the hummocking process which may be invoked to explain the formation of high (up to 10 m above the water level) hummocks. Conditions necessary for hummocking are described and the areas and seasons during which hummocks occur are indicated. In the second part of the paper, the rate at which the hummock height is being reduced during: 1. windless weather with below-zero air temperature, and 2. windy weather (strong wave action) and above-zero air temperature, is discussed. The formation of the so-called ice depression around a hummock is described as well. In the concluding part, attention is being paid to destructive effects of ice in the area affected by hummocking
7

Verification of the model of a solar energy radiation input to the sea surface against actinometric data

100%
Krezel A., Kozlowski L.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
17-38
EN
Data on the planetary albedo which were registered in Channel 0.4 - 1.1 mum (VIS) by the geostationary satellite METEOSAT were used to determine a quantitative characteristic of a cloud cover over the Baltic Sea area. By applying the obtained results and the input data generated by the model of the Interdisciplinary Centre for Mathematical and Computational Modelling of the Warsaw University, calculations of irradiance on the sea surface were done using the model of radiation transmission in the Baltic Sea atmosphere. The results were compared to the actinometric data that were continuously recorded by the Gdansk Maritime Institute?s measuring buoy that was anchored at 18?31.094?E and 54?56.157?N. It was noted that the application of ICM model information on the atmosphere to the solar radiation transmission model results in decreasing the calculated irradiance values by approximately 15% in relation to the measured values. If cloud cover data in the input data set are replaced by relevant satellite data, then the average difference between the measured data and the modelled ones decreases to approximately 5%.
8

Diatoms as indicators of water pollution in the coast-al zone of the Gulf of Gda?sk (Southern Baltic Sea)

100%
Bogaczewicz-Adamczak B., Klosinska D., Zgrundo A.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
59-75
EN
The subject of the study was microphytobenthos in the sediments of the coastal zone of the Sopot sea-resort (the Gulf of Gdansk). Sediment samples were taken from 12 sites situated in the mouths of the streams and creeks and from the beach close to the sea, once a month from January to December 1998. The indicative groups of diatoms were the basis of the estimation of water quality, taking into consideration its salinity, trophic state and saprobity. The quality of water was classified according to Lange-Bertalot (1979). The results of the diatom studies indicate that the dominating groups were the oligo-halobous and mesohalobous taxa, chatacteristic of highly eutrophic waters. The most abundant groups were the resistant (poly-saprobic and '-mesosaprobic) and tolerant ($-mesosaprobic) diatoms, which are indicators of water quality class III in the coastal zone of the Sopot sea-resort.
9

Theoretical approach to the estimation of water optical properties from the radiance field in the sea

100%
Matciak M.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
99-111
EN
A general problem of determining water inherent optical properties from natural light radiance distribution in the sea and its depth dependency is analysed. Expressions for light-beam attenuation coefficient of practical significance are obtained. The presence of internal sources of light energy like fluorescence and Raman scattering by water molecules is included in consideration.
10

Diatom record of northeast Atlantic circulation changes in marine isotope stages 1 and 5

100%
Witak M., Kuijpers A.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
21-38
EN
Fossil and subfossil diatom floras were analysed in a sediment core taken near the outlet of the Faroe Bank Channel, NE Atlantic. Diatom preservation horizons were found at various levels in the core. The correlation with the oxygen isotope stratigraphy of the core indicates that these horizons correspond to the Marine Oxygen Isotope Sub-Stages 5e (Eemian), 5a and Stage 1 (Holocene). Results of the study show that environmental conditions for the development of diatoms were more favourable in Stage 5 than in the Holocene. At the very beginning of the Sub-Stages 5e and 5a distinct changes in the diatom concentration are indicative of circulation changes probably associated with a marked intensification of the North Atlantic Current. The highest surface water temperature is indicated by the diatom flora from early Sub-Stage 5e.
11

Presumable groundwater seepage influence on the upwelling events along the Hel Peninsula

100%
Matciak M., Urbanski J., Piekarek-Jankowska H., Szymelfenig M.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
125-132
EN
Low water salinity values were recorded during upwelling events along the marine side of the Hel Peninsula. The most probable explanation of those unexpected results is a submarine groundwater discharge in this region. The hydrogeological structure of the area and some previous studies on salinity anomalies observed in the Gulf of Gdansk seem to confirm the hypothesis. This report encourages further complex research aimed at studying this phenomenon.
12

Feeding preferences of the round goby Neogobius melanostomus and mushroom goby Neogobius cephalarges in the Odessa Bay

100%
Kvach J., Zamorov V.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
91-101
EN
Feeding preferences of the round goby and mushroom goby from the Odessa Bay (areas with civil engineering works) were studied. Two goby species were observed to choose different dietary items in dependence of the season and place of fishery. The mushroom goby chose Nereis succinea more intensively than the round goby.
13

Spatial (depth dependent) and temporal distribution of fish in sandy eulittoral of the tip of the Hel Peninsula (the Gulf of Gdansk - Baltic)

100%
Sapota M. R.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
77-89
EN
Presence of fish from 10 species was confirmed in shallow close to shore waters on the tip of the Hel Peninsula, in period from early spring to late autumn. Zone from shore to 5 meter depth was investigated. The highest number and biomass were noticed in summer on 3 meter depth. As general biodiversity taking into account number increases with increasing depth, whereas biodiversity taking into account biomass is not so depth dependent. Flounder is the absolute dominant at all depths in investigated region. Common goby and three spined stickleback are two other significant species. Comparison of data from all investigated depths shows that sampling in the most close to shore zone (1 meter depth) let well describe fish community of near shore shallow waters in investigated area.
14

Density, biomass, and distribution of benthic invertebrates in the mid-lake zone of the coastal Lake Gardno

100%
Dobrowolski Z.
|
EN
The mean density (4.2 ? 103 ind. m-2) and mean biomass (10.8 g wet weight m-2) of the mid-lake zoobenthos in the mixo-oligohaline Lake Gardno were consistent with the respective ranges typical of freshwater, polymictic, and strongly poly-trophic lakes of northern Poland. The major components of the Lake Gardno macrozoobenthos were tubificid oligochaetes and chironomid larvae, the latter dominating in terms of abundance and biomass. Neomysis integer (Leach) was the sole and numerically scant marine invertebrate in the Gardno mid-lake macro-zoobenthos. Biodiversity, taxonomic composition, dominance structure as well as densities and biomass of the macrozoobenthos studied showed considerable spatial variation. The lake-river contact zone exhibited the presence of the ecotone effect. Dynamics of the abundance and biomass of the benthic invertebrates inhabiting that zone were markedly different from those found in other mid-lake habitats of the Gardno.
15

Helminthes of gobies from the Tuzly?s Lagoons (the north-western part of the Black Sea)

100%
Kvach J.
|
EN
The round goby Neogobius melanostomus and the grass goby Zosterisessor ophiocephalus are most widespread fishes of the Tuzly?s group salty lagoons - Alibey and Burnas (North-Western part of the Black sea, Ukraine). The helminthofauna of these fishes consists of six species of parasites: Cryptocotyle lingua, C. concavum, Acanthocephaloides propinquus, Telosentis exiguus, Contracaecum microcephalum, and Cucullanellus minutus. Trematods of the genus Cryptocotyle, acanthocephalans A. propinquus, and larvae of nematods C. microcephalum are reported from this water area for the first time; the latter from gobies for the first time. The interrelation between infection of fishes and biology of helminthes and their host is discussed. This is the first study containing the complete information on the parasite fauna of the Lagoons.
16

Effect of salinity, temperature and light on growth of Anabaena flos-aquae and Nostoc sp. div. (cyanobacteria, blue-green algae)

100%
Plinski M., Dziopa M.
|
EN
Two species of blue-green algae have been studied under laboratory conditions in several combinations of salinity (0, 8, 16, 24 PSU), light (20, 70, 120, 170 muE m^-2 s^-1) and temperature (20, 25, 30, 35 ?C). Temperature within the range of 30-35 ?C and light intensity of 170 mE m^-2 s^-1 were the optimum to achieve a maximum growth effect in the two species examined. Salinity as an environmental factor showed that these two tested species are fresh water in origin with some tolerance to increased salinity concentration. The best growth rate for Anabaena flos-aquae was stated in 0 PSU medium for all temperature and light conditions. For Nostoc sp. div. medium with 8 PSU was the optimum one.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.