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1

Distribution of indole-3-acetic acid in seawater and marine sediments of the Gulf of Gdansk

100%
Mazur H.
Oceanological Studies
|
1994
|
issue 67/10
27-32
EN
HPLC method was used to detect the presence of auxin indole-3-acetic acid (IAA) in seawater and sediments of the Gulf of Gdansk.In spring considerably higher concentration of IAA was measured in sediments and near-bottom water than in surface water.The concentration of IAA changes with season and sampling statin and it seems to depend on process undergoing in the marine environment.
2

Occurence and significance of Chaetoceros (Bacillariophyceae) reasting spores in the Holocene sediments of the Baltic Sea

100%
Stachura-Suchoples K., Zgrundo A., Witkowski A.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
87-92
EN
The material studied originated from the marine Holocene sediments of the Gulf of Gdansk and from Kiel Bay. During the diatom analysis, the interest was focused on the dominance of Chaetoceros resting spores. An abundant occurrence of such resting spores was interpreted in terms of changes of environmental conditions in the study areas. In the fossil sediments, it indicated the inflow of the oceanic waters which caused the salinity increase and the natural rise in the nutrient content, whereas in the subfossil sediments, it marked the increasing human impact.
3

Phytoplankton as eutrophication indicator in the Gulf of Gdansk water

100%
Niemkiewicz E., Wrzolek L.
Oceanological Studies
|
1998
|
vol. 27
|
issue 4
77-92
EN
The present survey presents the results of phytoplankton number and biomass measurements and also chlorophyll a contents in marine water. The investigations were started in autumn1994 and continued in summer 1995 along six coastal profiles in the Gulf of Gda?sk. The paper provides the current condition of the phytoplankton - the first link in the food chain in a water body biocenosis. The research confirmed also the early 80s findings as to the changed structure of phytoplankton domination where flagellates dominated in terms of number and dinoflagellates - in terms of biomass.
4

Formation of phytoplankton in the first years of existence of the water supplying reservoir (southern Poland) against the background of increased eutrophication process

88%
Pajak G.
Oceanological and Hydrobiological Studies
|
2003
|
issue 4
5-77
EN
The aim of the investigations was a recognition of the complex of physico-chemical parameters affecting the dynamics and structure of phytoplankton. The taxonomical composition, abundance and biomass of nano- and phytoplankton has been determined. In the development of the reservoir four stages were distinguished. In stage I of the reservoir filling, the temperature and pH value of water as well as the level of PO4-P, had a decisive influence on the process of phytoplankton formation. A sudden change in the damming ordinate in stage II of the reservoir studies contributed to the development of nanoplanktonic diatoms, and the refilling of the reservoir ( stage III) caused an abundant development of green algae. After the reservoir had been filled (stage IV) the planktonic forms of cryptophytes group dominated. The initial dominance of taxons had no influence on its structure after a four-year searching. A very similar pattern of proportionally altering phytoplankton communities in the investigated basins (BM and BD) suggests that both the depth and availability of nutrient compounds were not the limiting factors in the initial period of functioning of the Dobczyce Reservoir.
5

Phytoplankton and zooplankton in the zones of rushes and submerged vegetation of Lake Lubaskie Duze

88%
Kuczynska_ K. N., Meyssyasz B.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
23-27
EN
The examined Lake Lubaskie Duze covering the area of 41.5 ha is a dimictic lake a mean depth of 12 m (max. depth 16 m). The systematic observations of phyto- and zooplankton changes together with the selected physico-chemical parameters of water which were carried out for this lake during 1991-1996 showed its mesotrophic character declining towards eutrophy . In 1996, the research was expanded to the analyses of the plankton dynamics in the zones of rushes and submerged vegetation. The purpose of this research was to examine qualitative and quantitative changes of plankton inhabiting various habitats. The samples were collected along the transect starting from rushes to the area of open water (pelagic zone). The sampling was performe at four stations: station 1 - zone of rushes, community of reed and cattail; station 2 - zone of open water area between stations 1 and 3; station 3 - zone of submerged vegetation, community of hornwort; station 4 - open water (pelagic zone). Taking into consideration the spatial distribution of plankton, the differences in the taxonomic groups inhabiting the zones along the transect were noted. In the zone of submerged vegetation, the higher species diversity and greater numbers of specimens were observed than in the zone of rushes.
6

Eutrophication in the southern Baltic Sea between 1989-1998

88%
Lysiak-Pastuszak E., Niemkiewicz N. E., Niemkiewicz E., Dragas D. N., Dragas N.
Oceanological Studies
|
2000
|
vol. 29
|
issue 4
27-41
EN
In the Baltic Sea the process of eutrophication - increasing productivity - has became accelerated in the recent century and presently it stands the major ecological problem of this sea. One of the characteristic symptoms of eutrophication is an increase of nutrient reserves in the euphotic layer during winter accumulation, providing favourable feeding conditions for the intensive development of spring phytoplankton population, the main source of organic material in the marine ecosystem. In this study an attempt was undertaken to correlate the variability of biological parameters (phyto-plankton biomass and chlorophyll concentration) determined between 1989-1998 with chemical (nutrient concentrations in winter, oxygen saturation) and physical ones (water transparency). The parameters under scrutiny are measured regularly in water of the Bornholm Deep, SE Gotland Deep and Gdansk Deep within the framework of the Baltic Sea monitoring programme. The mean annual biomass of phytoplankton and mean annual chlorophyll content in the surface (0-10 m) layer were related to winter concentrations of phosphate, nitrate and silicate. Water saturation with oxygen during vegetation season was analysed in relation to biological parameters and the same analysis was carried out for water transparency. Statistically significant correlations between the analysed determinands were found in water of the Gdansk Deep and SE Gotland Basin but not for the Bornholm Deep.
7

Natural and anthropogenic eutrophy of the northern Adriatic Sea.Impact on coastal biocenoses

88%
Crema R., Catelli A., Bonvicini Pagliai A. M., Zunarelli R.
Oceanological Studies
|
1993
|
issue 64/3
317-329
8

A first ecological evaluation of the diatom flora in Central Europe: species diversity, selective human interactions and the need for habitat protection

88%
Lange-Bertalot H.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
5-12
EN
The recently revised check-list of diatoms found in Germany contains 1437 taxa (1632 taxa have been recorded for Central Europe). Clear correlations with ecological conditions were established for 1000 taxa (70% of 1437). 267 predominantly marine taxa also occur in inland waters; they penetrate progressively into rivers contaminated with industrial waste waters. 61 taxa are aerophilic and 164 eutraphentic, 91 tolerant to all trophic conditions. Very few species in these ecological groupings are endangered. However, at last 417 oligo- or slightly mesotraphentic taxa are included in the 'Red List'. This strongly indicates that conserving oligo- and dystrophic waters as well as lower mesotrophic habitats can best protect species diversity.
9

Eutrophication of Lake Swiete (Gniezno, Western Poland) as evidenced by succession of algal assemblages in sedimentary record

88%
Machowiak D.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
83-86
EN
The subject of the study was to the compare results of phytoplankton and the sediment core analyses from several lakes in Wielkopolska (Western Poland). Species composition of algal assemblages occurring in these lakes changed as would be expected for increasing trophic conditions. Along with progressive eutrophication diatom taxa belonging to genera Stephanodiscus and Cyclotella became replaced by green algae and finally by blue-green algae. The dominance of blue-green algae is attributed to hypertrophic conditions.
10

Experimental studies in processes taking place in enclosures with mixed sea and Vistula River water

88%
Witek Z., Pastuszak M., Nakonieczny J., Ochocki S., Zalewski M., Maciejowska M., Gromisz S., Mackiewicz T., Wrzesinska-Kwiecien M.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
35-57
EN
Biological and chemical processes occurring in seawater from the Gulf of Gdansk, 'enriched' with Vistula river water, were studied in a series of microcosm experiments covering different seasons of the year. Concentrations of inorganic forms of nitrogen were, with one exception, 25 - 800 times higher in the Vistula water than those in the sea; phosphates were from 3.5 to 70 times higher. Two phases were observed during the incubations: during the first there were marked increases in primary production, chlorophyll concentration and bacterial production, and a de-crease in nutrient concentrations. The second phase was characterised by a lack of phosphates, a gradual decrease in chlorophyll concentrations, and an increase in zooplankton abundance. During the growing season the first phase lasted only a few days, during which nitrates and silicates were taken up at a rate of 2-4 mmol?dm-3?d-1 and phosphates and ammonia at a rate of 0.05-0.3 mmol?dm-3?d-1. Further phytoplankton growth and further nutrient uptake were most frequently limited by phosphorus depletion. Phosphorus was probably also a factor limiting bacte-rioplankton growth, which appeared to be correlated with primary production. In spring and autumn phytoplankton growth was additionally limited due to grazing by protozooplankton and rotifers, in summer by nitrogen exhaustion.
11

Water quality study of the Condor and Capivara streams, Porto Alegre Municipal District, Rs, Brazil, using epilithic diatom biocenoses as bioindicators

75%
Lobo E. A., Callegaro V. L. M., Wetzel C. E., Hermany G., Bes D.
Oceanological and Hydrobiological Studies
|
2004
|
issue 2
77-93
EN
The aim of this work was to evaluate the water quality of two urban streams, Condor and Capivara, in the Municipal District of Porto Alegre, RS, Brazil, by measuring physical, chemical and biological variables. Between May 1999 and August 2000, six field trips were taken to sample five sites distributed along the streams. Multivariate canonical correspondence analysis (CCA) was applied for the complete evaluation of physical, chemical and biological data. It was confirmed that phosphate had the largest impact on ordination and exhibited an evident eutrophication gradient. Mayamaea atomus, Amphora montana, Sellaphora pupula and Cyclotella meneghiniana were extremely abundant under such conditions.
12

The eutrophication model of the Vistula Lagoon

75%
Kwiatkowski J., Koch_Rasmussen E., Ezhova E., Chubarenko B.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
5-33
EN
The Vistula Lagoon is a shallow coastal ecosystem located on the Polish-Russian border in the coastal area of the southern Baltic. It is strongly influenced by inflows of seawater from the Baltic as well as by river inflow from the catchment area. High concentrations of nutrients in the Lagoon cause high primary production rates (ca 190 gC/m2/year) and other processes related to eutrophi-cation. Mathematical modelling of the physical and biogeochemical processes in the Vistula Lagoon has been applied as a tool for environmental assessment. The integrated MIKE 21 two-dimensional modelling system (by the Danish Hydraulic Institute / Water Quality Institute) was applied in the study. The eutrophication model of the Vistula Lagoon describes the nutrient cycle including eutro-phication-related processes. This paper describes the setup and calibration of the eutrophication model and presents the results of the basic calculation reflecting the situation in 1994. The role of the model in the evaluation of the ecological situation and in water management and planning is discussed. The model has been calibrated against monitoring measurements carried out in the Polish and Russian parts of the Vistula Lagoon.
13

Nutrients and oxygen in the Gulf of Gdansk

75%
Falkowska L., Bolalek J., Nowacki J.
Oceanological Studies
|
1993
|
issue 64/3
131-162
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