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

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Kotwicki l., Danielewicz J., Turzynski M., Weslawski J. M.

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.

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1 Oceanological Studies

1 2002

1 Danielewicz J.

1 Kotwicki l.

1 Turzynski M.

1 Weslawski J. M.

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