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3 Oceanological Studies

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

100%

Osowiecki A. , Warzocha J.

Oceanological Studies

1996

tom 25

nr 1-2

137-149

The macrobenthos in the Gdansk Basin and southern parts of the Bornholm and Gotland Basins was studied from 1978-1993 to document changes in the structure of benthic communities.Recolonisation following inflows of saline water was observed in the deep bottom habitat.Fluctuaction in microfauna abundance and biomass were recorded in the shallow water habitat, but no trend could be detected.No permanent macrofauna was encountered in the deepest part of the Bornholm and Gdansk Basins.

Phytoplankton of the Gdansk Basin in 1979-1993

100%

Wrzolek L.

Oceanological Studies

1996

tom 25

nr 1-2

87-100

In the studies on phytoplankton done within the framework of the biological monitoring of the Baltic Sea in 1979-1993 significant changes were found in the dominance structure though not the species composition.The previously dominant phyla Chrysophyta and Cyanophyta have been replacement by Pyrrophyta and Flagellata.No long-term trends in abundance and biomass of phytoplankton or in chlorophyll a concentration could be detected.

Cyanophyta blooms in Koronowski Reservoir in the background of environmental conditions

72%

Wisniewska M.

Oceanological Studies

1998

tom 27

nr 1

45-52

On the basis of floristic analysis, the occurrence of 132 taxons of plankton algae in Koronowski Reservoir was determined. The spring and autumn plankton was dominated by diatoms, while summer plankton by blue-green algae. The species composition, structure of the abundance of algae and concentration of chlorophyll as well as physicochemical conditions of water suggested a highly eutrophic character of this reservoir with a starting expansion of blue-green algae, mainly species considered to be toxic.