Wyniki wyszukiwania

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Geostatistical methods for estimation of toxicity of marine bottom sediments based on the Gdansk Basin area

100%

Witt M., Kobusinska M., Maciak J., Niemirycz E.

Oceanological and Hydrobiological Studies

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2014

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tom 43

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nr 3

2

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The size structure of the Mesodinium rubrum population in the Gdańsk Basin

100%

Rychert K.

Oceanologia

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2004

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tom 46

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nr 3

The ciliate Mesodinium rubrum Lohmann 1908 (= Myrionecta rubra Jankowski 1976) is an important phototrophic organismin the Gdańsk Basin. In June 2002 the vertical distribution and size structure of the M. rubrum population were studied. Its presence was generally observed in the whole water column (one exception was the anoxic near-bottom zone in the Gdańsk Deep) at all stations studied. Maximum abundance (18 300 cells dm−3) was recorded at 26 m depth at the station located in the inner Gulf of Gdańsk. Analysis of the size structure of the counted organisms demonstrated the co-existence of small and large cells of M. rubrum in the upper layer of the water column and a gradual increase with depth of the prevalence of large specimens. This shows that at least two forms of M. rubrum exist in the region studied. Deep migrations are probably undertaken only by relatively large organisms.

3

Nanoflagellates in the Gdańsk Basin: coexistence between forms belonging to different trophic types

100%

Rychert K.

Oceanologia

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2006

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tom 48

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nr 2

Nanoflagellates are important bacterivores, but their role is often underestimated because forms capable of phagotrophy and containing chlorophyll (mixotrophs) are excluded from analyses. Research conducted in the coastal zone of the Gdańsk Basin (Baltic Sea) revealed seasonal changes in the relationship between the biomasses of small (1–8 μm) nanoflagellates with (NFChl+) and without chlorophyll (NFChl–). Three distinct patterns were distinguished: (i) spring, when the biomass of NFChl+ was lower than that of NFChl–, (ii) summer and autumn, when NFChl+ were dominant (about 90%), and (iii) late autumn and winter, when the prevalence of NFChl+ was lower (71–79%). Additional studies showed the existence of spatial differences in the composition of the nanoflagellate community. These spatial differences were not shaped by freshwater input. The possible importance of mixotrophic forms in the Gdańsk Basin is discussed.

4

Variability of fluorescence of dissolved and suspended substances of biological origin in the Gdansk Basin during the International Ecological Experiment “Sopot 87”

84%

Karabashev G. S., Khanaev S. A., Petrosov A. Y.

Oceanologia

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1990

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tom 28

5

Assimilation experiments in the Gdansk Basin [the Sout-Eastern Baltic]: How useful are the sea level data from coastal tide gauges for modelling of hydrophysical fields?

84%

Jankowski A., Jedrasik J.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr 4

105-128

6

12-hour cycle of matter transformation in the sea surface microlayer in the offshore waters of the Gdańsk Basin (Baltic Sea) during spring

84%

Falkowska L.

Oceanologia

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2001

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tom 43

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nr 2

Short-term measurements of nutrient and DOC concentrations and suspended matter (particles, chlorophyll a, phaeophytin, algae and ATP concentrations) carried out in seawater layers of varying thickness (10, 90, 250 μm and the underwater layer – 15 cm depth) in spring form the basis for a discussion of the diurnal fluctuations of nutrient and suspended organic matter concentrations. Quantitative and qualitative differences in the composition of neuston species were recorded in selected sub-layers of the chemically stratified sea surface microlayer. The non-linear regression equation was applied in a mathematical model of the diurnal fluctuations of nutrients and organic matter. Two maxima and two minima were found in the diurnal cycle of nutrient concentrations and organic suspensions in sub-layers of different thickness selected from the sea surface. The first maximum, expressed by the proliferation of phytoneuston, lasted from the very early morning till mid-morning. The second maximum occurred in the afternoon. The chlorophyll a concentration, and ATP and neuston abundance declined markedly around noon, when the biologically-damaging radiation dose increased, compelling the downward migration of organisms. At the same time, the photo-oxidation of dissolved organic matter intensified and the concentrations of inorganic forms of nitrogen and phosphorus rose. A shift (up to 2 h) between the maximum and minimum neuston concentration in these sea surface layers was indicative of phototaxis occurring within the entire surface microlayer and in the underwater layer. After sunset the decline in phytoneuston abundance could be related to zooplankton grazing as well as to respiratory breakdown.

7

Porewater nutrients [phosphate, ammonia and silicate] in the eastern part of the Southern Baltic Sea

84%

Graca B., Witek Z., Burska D., Bialkowska I., Pawelec A., Bolalek J.

Oceanological and Hydrobiological Studies

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2006

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tom 35

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nr 3

8

Horizontal and vertical distribution of lignin in surface sediments of the Gdańsk Basin

84%

Staniszewski A., Lejman A., Pempkowiak J.

Oceanologia

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2001

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tom 43

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nr 4

The aim of this study was to identify and quantify lignin transported from the River Vistula to the accumulation area in the Gdańsk Basin. Sediment samples collected along the Vistula mouth –Gdańsk Deep transect were analysed for lignin. Lignin was characterised by oxidative degradation, cupric oxide being chosen as the most suitable oxidising agent. The polar functional groups of the oxidation products were silylated and the derivatives analysed by capillary gas chromatography on fused capillary silica columns with flame ionisation detection. Lignin-derived oxidation products were quantified in the range from 3 to 20 μg g−1 dry wt. for phenolic acids and from 6 to 12 μg g−1 dry wt. for phenolic aldehydes. Differences in oxidation products contents are assigned to different lignin sources in the marine environment. The horizontal and vertical gradients of these compounds in the sediments of the Gdańsk Basin are documented. The results are discussed in terms of the origin and fate of organic matter in the Gdańsk Basin. The measured differences in quality and quantity of the identified oxidation products provide insight into diagenetic processes in the surface marine sediments.

9

Short-term fluctuations of chlorophyll a fluorescence versus diurnal variations of solar radiation in the surface water of the Gdansk Basin

84%

Magulski R., Falkowska L., Dunajska D., Pryputniewicz D., Sikorowicz G.

Oceanological and Hydrobiological Studies

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2004

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tom 33

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nr 3

10

Baroclinic Rossby radius of deformation in the Southern Baltic Sea

67%

Osinski R., Rak D., Walczowski W., Piechura J.

Oceanologia

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2010

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tom 52

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nr 3

417-429

The first baroclinic Rossby radius of deformation (R1) is a fundamental horizontal scale of mesoscale processes. This scale is important for planning both numerical modelling and study areas. R1 was computed on the basis of an 11-year series of high resolution CTD measurements collected during r/v ‘Oceania’ cruises. The data set covered the three main basins of the Baltic Proper: the Bornholm Basin (BB), the Słupsk Furrow (SF) and the Gdańsk Basin (GB). The smallest mean value of R1 was found in the Gdańsk Basin (5.2 km), the largest one in the Bornholm Deep (7.3 km). The seasonal variability of R1 is lower in the western basin than in the eastern one. The seasonal cycle of R1 may be broken by extreme events, e.g. main Baltic inflows (MBI) of saline water. The inflowing water rebuilds the vertical stratification in the southern Baltic Sea and dramatically changes the R1 values. The difference of R1 between a stagnation period and an inflow situation is shown on the basis of observations made during 2002–2003. The main inflow occurred in winter, after ten years of stagnation, and the very low values of R1 (about 4 km) changed to very high ones (more than 9 km). Analysis of stagnation and saltwater inflow events may throw light on the value of R1 in future climatic scenarios. The potential influence of climate change on Baltic Sea salinity, especially a decrease in MBI activity, may change the baroclinic Rossby radius of deformation and the mesoscale dynamics. Values of R1 are expected to be lower in the future climate than those measured nowadays.

11

Communities of heterotrophic protists (protozoa) in the near-bottom zone of the Gdansk Basin

67%

Rychert K.

Oceanological and Hydrobiological Studies

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2011

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tom 40

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nr 3

12

Chemical forms and distribution of heavy metals in core sediments from the Gdansk Basin, Baltic Sea

67%

Belzunce S. M. J., Szefer P., Wilson M. J., Bacon J., Bolalek J.

Polish Journal of Environmental Studies

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2007

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tom 16

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nr 4

505-515

Short sediment cores (30 cm length) were taken along a transect of the Gdansk Basin from the mouth of the Vistula River out into the Baltic Sea in June 1996. The chemistry and mineralogy of surficial and buried sediments were determined and Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were analyzed in total and in fractions using a sequential extraction procedure. The bulk and clay mineralogy of the sediments were determined by XRD and SEM. The concentrations of some of the trace metals in sediments are above pre-anthropogenic background. In particular, the surficial samples are substantially enriched in Cu, Pb and Zn, suggesting an anthropogenic origin. The concentrations of Cu, Pb and Zn range from 21-71 ^g-g"1, 56-210 ^g-g"1 and 21-83 ^g-g-1, respectively. Unexpectedly, the concentrations of trace metals increase seawards within the Gdańsk Basin. The forms of binding are different for each metal. Cobalt, Cr and Fe are mainly associated with the residual mineral fraction of the sediment, although in samples with high Fe concentrations there is a significant correlation with organic compounds. In contrast, Mn, Ni, Pb and Zn are predominantly associated with oxides and the organic fractions, with a significant percentage associated with the carbonate and exchangeable cation fractions, whilst Cu is mainly bound with the organic fraction.

13

Phytoplankton of the Gdansk Basin in 1979-1993

67%

Wrzolek L.

Oceanological Studies

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1996

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tom 25

|

nr 1-2

14

Macrozoobenthos of the Gdansk, Gotland and Bornholm Basins in 1978-1993

67%

Osowiecki A., Warzocha J.

Oceanological Studies

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1996

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tom 25

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nr 1-2

15

Anthropogenic aerosols over the coastal zone of Gdansk Basin

67%

Lewandowska A., Falkowska L.

Archiwum Ochrony Środowiska

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2005

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tom 31

|

nr 3

16

Changes in the mesozooplankton of the Gdansk Basin in the last two decades

67%

Wolska-Pys M.

Oceanological Studies

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1996

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tom 25

|

nr 1-2

17

Thermohaline conditions in the Gdansk Basin

59%

Cyberska B., Krzyminski W.

Oceanological Studies

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1996

|

tom 25

|

nr 1-2

18

The regional characteristics of the Gdansk Basin

51%

Andrulewicz E.

Oceanological Studies

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1996

|

tom 25

|

nr 1-2

19

Toxic substances in the water, bottom sediments and organisms of the Gdansk Basin

51%

Andrulewicz E.

Oceanological Studies

|

1996

|

tom 25

|

nr 1-2

Ograniczanie wyników

Geostatistical methods for estimation of toxicity of marine bottom sediments based on the Gdansk Basin area

The size structure of the Mesodinium rubrum population in the Gdańsk Basin

Nanoflagellates in the Gdańsk Basin: coexistence between forms belonging to different trophic types

Variability of fluorescence of dissolved and suspended substances of biological origin in the Gdansk Basin during the International Ecological Experiment “Sopot 87”

Assimilation experiments in the Gdansk Basin [the Sout-Eastern Baltic]: How useful are the sea level data from coastal tide gauges for modelling of hydrophysical fields?

12-hour cycle of matter transformation in the sea surface microlayer in the offshore waters of the Gdańsk Basin (Baltic Sea) during spring

Porewater nutrients [phosphate, ammonia and silicate] in the eastern part of the Southern Baltic Sea

Horizontal and vertical distribution of lignin in surface sediments of the Gdańsk Basin

Short-term fluctuations of chlorophyll a fluorescence versus diurnal variations of solar radiation in the surface water of the Gdansk Basin

Baroclinic Rossby radius of deformation in the Southern Baltic Sea

Communities of heterotrophic protists (protozoa) in the near-bottom zone of the Gdansk Basin

Chemical forms and distribution of heavy metals in core sediments from the Gdansk Basin, Baltic Sea

Phytoplankton of the Gdansk Basin in 1979-1993

Macrozoobenthos of the Gdansk, Gotland and Bornholm Basins in 1978-1993

Anthropogenic aerosols over the coastal zone of Gdansk Basin

Changes in the mesozooplankton of the Gdansk Basin in the last two decades

Thermohaline conditions in the Gdansk Basin

The regional characteristics of the Gdansk Basin

Toxic substances in the water, bottom sediments and organisms of the Gdansk Basin