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Do wastewater treatment plants act as a potential point source of microplastics? Preliminary study in the coastal Gulf of Finland, Baltic Sea.
WWTPs may operate as a route for microplastics entering the sea because the average fibre concentration was 25 times higher and the particle concentration was three times higher in the effluent compared to the receiving body of water.
Simultaneous measurement of food particle selection and clearance rates of planktonic oligotrich ciliates (Ciliophora: Oligotrichina)
The overall ciliate food size spectrum covered the size range of the most abundant food items in the Baltic summer plankton, and there appears to be 2 different feeding strategies: specialistic and generalistic, where the ciliates either concentrate on feeding on a narrow sizerange of food organisms, or use food particles of a wide size range, with little or no preferences within this range.
Planktonic ciliates in the Baltic Sea in summer: distribution, species association and estimated grazing impact
A deep-water association characterized by large ciliates was found at the oxic/anoxic water interface at the 2 deepest stations, Bornholm and Gotland Basins, in both years, whereas the other associations found were found closer to the surface.
Distribution and reproduction of the Arctic ctenophore Mertensia ovum in the Baltic Sea
Comparison with published data from the 1980s indicates that the present-day ctenophore abundance is ~80% lower in the north and ~55% higher in the southern parts of the Baltic Sea, due to reasons yet to be established.