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1

The comparison of West Spitsbergen and Franz Josef Land coastal marine ecosystem

100%
Weslawski J. M.
Oceanological Studies
|
1993
|
issue 64/3
331-341
2

Preliminary studies on the organic matter deposition and particle filtration processes in a sandy beach in Sopot - southern Baltic Sea

68%
Kotwicki l., Danielewicz J., Turzynski M., Weslawski J. M.
Oceanological Studies
|
2002
|
vol. 31
|
issue 3-4
71-84
EN
Sopot?s intensively used sandy beach was studied to assess organic matter deposition and swash water filtration through the sediment on the water line. The swash water contained from 4 to 80 mg Total Suspended Matter (TSM) per dm3, 3 to 12% of it was organic. Phytoplankton ranged from 1 to 15 million cells per dm3, depending on the water turbidity and contained a mixture of pelagic and micro-phytobentic taxa. Plankton larvae and Rotatoria dominated the animal biomass. In the process of wave filtration through the sand all planktonic animals were retained in the sediment, while a number of meiofaunal Nematoda and Ciliata were actively transported (?washed out?) from the upper sediment layers. Macroscopic particle (filamentous algae) deposition in May ranged from 20 to 1000 g POC m-2 per day. Nutrient concentrations were higher in the interstitial water than in the swash water, for most of the year. Hence, we suppose that the Sopot municipal beach serves as a nutrient source for coastal waters.
3

The sandhopper (Talitrus saltator, Montagu 1808) on the Polish Baltic coast. Is it a victim of increased tourism?

52%
Weslawski J. M., Stanek S. A., Stanek A., Siewert S. A., Siewert A., Beer B. N., Beer N.
Oceanological Studies
|
2000
|
vol. 29
|
issue 1
77-87
EN
Sandhopper occurrence and their habitat preferences were examined at 10 km intervals along 500 km of the Polish coastline in 1997. The sandy beach coastline was divided into 5 types based on physical factors. Compared to earlier data from 1950-70, sandhoppers were found in only 44% of their former sites of occurrence. In all sites examined, sandhopper density was markedly lower (an average of below 20 ind. m-2) compared to the former data (an average of 150 ind. m-2). The reasons for the sharp decline in sandhopper occurrence are discussed pointing at the increase of touristic activity and changes in trophic conditions as the most likely cause. Contamination alone is unlikely to affect the sandhoppers, since the most contaminated beaches at the Vistula Spit have been those with the highest sandhopper density observed recently.
4

Sandy coastlines - are there conflicts between recreation and natural values?

36%
Weslawski J. M., Urban-Malinga U.-M. B., Urban-Malinga B., Kotwicki K. L., Kotwicki L., Opalinski O. K., Opalinski K., Szymelfenig S. M., Szymelfenig M., Dutkowski D. M., Dutkowski M.
Oceanological Studies
|
2000
|
vol. 29
|
issue 2
5-18
EN
Unlike dunes, sandy beaches and the littoral zone are usually regarded as non-vulnerable. The biodiversity and biomass of interstitial organisms are low. How-ever, recent findings have shown that marine sands transfer energy very ef-fectively, and that chemical and biological reactions take place faster there than in fine-grained sediments. The importance of the microphytobenthos and bacteria to this system is little known. The effects of recreational pressure (trampling, beach cleaning and nourishment) are not well understood. A pilot study from the Baltic Sea shows the importance of trampling as a form of bioturbation, a very effective way of fragmenting and mixing organic matter with the sand. The high diversity of diatoms and meiofauna in undisturbed beaches may act as an effective biological filter for some types of pollutants, while less diverse, but more abundant biota in disturbed areas are more effective in processing organic matter (self-cleaning of the beach).
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