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4 Oceanological Studies

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The role of filamentous brown algae in the degradation of the underwater meadows the Gulf of Gdansk

100%

Kruk-Dowgiallo L.

Oceanological Studies

1996

tom 25

nr 1-2

125-135

The changes recorded in the last 20 years in the photobenthos of the Gulf of Gdansk are especially noticeable in Puck Bay and have led to the degradation of the Zostera marina underwater meadows.One important reason for this is the mass growth of filamentous brown algae from the genera Ectocarpus and Pilayella, as result of which the number of species and the overall biomass of the vegetation have fallen, and the filamentous brown algae have become dominant.The range of the vascular plants, including that of Zostera marina, has shrunk very considerably.

Area and scope of autumn 1994 and summer 1995 investigations

100%

Kruk-Dowgiallo L.

Oceanological Studies

1998

tom 27

nr 4

5-9

This article presents results of complex investigations conducted in the autumn 1994 and summer 1995 by the Water Ecology Laboratory of the Institute of Environmental Protection, Branch of Gdansk. The research was a continuation of studies commenced in summer 1992, within the framework project 'Development of a system of protection and restoration of the Gulf of Gdansk biocenosis' (Kruk-Dowgiallo and Ciszewski 1995; Kruk-Dowgiall?o and Dubrawski 1998). The project was financed from the statutory funds of the Institute of Environmental Protection (IEP). The estimation of industrial fish contamination extent was done on the basis of 1992-1994 studies, supervised by Dr Urszula Potajallo within a Project Research required by SRC (Scientific Research Committee) which was realized in the Institute of Marine and Tropical Medicine in Gdynia (Potajallo et al. 1995). The state of coastal sediments state estimation was provided on the basis of seasonal studies carried out in 1995-1996 within a MS thesis experiments performed in (IEP) by Aleksandra Kula, supervised by Dr Rajmund Dubrawski.

Phytobenthos as an indicator of the state of environment of the Gulf of Gdansk

100%

Kruk-Dowgiallo L.

Oceanological Studies

1998

tom 27

nr 4

105-121

Results of investigations carried out in June 1995 at the same stations as in June 1992 are presented. Only small differences in species composition, biomass and the range of phytobenthos occurrence were observed. Obtained results confirmed that the trends of phytobenthos changes in the Gulf of Gdansk are similar to those in inner Puck Bay, i.e. the existing predomination of brown algae of the Ecto-carpus and Pilayella genera and a decrease of the area of underwater meadows. However, in spite of these changes there still exist natural phytobenthos stands in the Gulf. Therefore, active protection measures will create potential possibilities of reviving the phytocenoses of the Gulf of Gdansk.

The state of environment of the gulf of Gdansk coast-al zone in autumn 1994 and summer 1995

63%

Kruk-Dowgiallo L. , Dubrawski R.

Oceanological Studies

1998

tom 27

nr 4

137-159

Results of monitoring carried out in the coastal zone between Kuznica and Gorki Wschodnie (down to 20 m depth) in autumn 1994 and summer 1995 are presented. These investigations were a continuation of measurements taken in the areas of Hel and Krynica Morska in summer 1992 (down to the 60 m depth). The state and directions of seasonal and multi-annual changes of chemical, micro-biological and biological properties of the water and sediment environment of the Gulf's coastal zone are discussed. The results of presented investigations and of experimental research carried out in the Gulf of Gdansk environment were the basis for the development of a system for protection and regeneration of the biocenosis of the Gulf.