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1

Mechanisms and control of microbiological processes of degradation and utillization of organic mater in lacustrine ecosystems of different degrees of eutrophication

100%
Chrost R. J., Gajewski A. J., Lalke E.
Biotechnologia
|
1994
|
issue 4
82-95
EN
The report presents the results of a study of phytoplankton primary and bacterial secondary production and enzymatic activities in surface lake water sampled from five lakes (Mazurian Lake District, Poland) of different degrees of eutrophication during summer stratification period.The rates of bacterial processes related to the tropic status of the lakes.The magnitude of bacterial production was strongly depended on bacterial enzymatic degradation of polymeric organic matter.Through the production of hydrolitic enzymes bacteria were capable of utilizing a variety of polymeric substrates, otherwise not utilizable, which predominated in lake water.The autors also propose and discuss a model of flow of organic matter in aquatic ecosystems and a role of bacteria and phages in this process.
2

The eutrophication model of the Vistula Lagoon

75%
Kwiatkowski J., Koch_Rasmussen E., Ezhova E., Chubarenko B.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
5-33
EN
The Vistula Lagoon is a shallow coastal ecosystem located on the Polish-Russian border in the coastal area of the southern Baltic. It is strongly influenced by inflows of seawater from the Baltic as well as by river inflow from the catchment area. High concentrations of nutrients in the Lagoon cause high primary production rates (ca 190 gC/m2/year) and other processes related to eutrophi-cation. Mathematical modelling of the physical and biogeochemical processes in the Vistula Lagoon has been applied as a tool for environmental assessment. The integrated MIKE 21 two-dimensional modelling system (by the Danish Hydraulic Institute / Water Quality Institute) was applied in the study. The eutrophication model of the Vistula Lagoon describes the nutrient cycle including eutro-phication-related processes. This paper describes the setup and calibration of the eutrophication model and presents the results of the basic calculation reflecting the situation in 1994. The role of the model in the evaluation of the ecological situation and in water management and planning is discussed. The model has been calibrated against monitoring measurements carried out in the Polish and Russian parts of the Vistula Lagoon.
3

Measurements of oxygen and inorganic nitrogen fluxes between sediments and water near the water outflow from the sewage treatment plant in Swarzewo

75%
Geringer d. O. M., Wolowicz M.
Oceanological Studies
|
1996
|
vol. 25
|
issue 3
67-78
EN
Between May and October 1994 a number of experiments were carried out focusing on the estimation of oxygen and nitrogen fluxes between sediments and near - bottom waters in the region of water outflow from the sewage treatment plant in Swarzewo. It was revealed that sediments play an important role in removal processes of excess inorganic nitrogen when its concentration rapidly increases in the waters. In the investigated area nitrogen is released from sediments into water at the rate of 40 mmol?m-2?h-1. Additionally, the intense production of oxygen by organisms which create microphytobenthos was confirmed. Outside the algae bloom period the primary production in the water in this region was smaller than the produc-tion in the surface layer of the sediments.
4

The chlorophyll alpha contents in the surface waters of the Gulf of Gdansk

75%
Latala A.
Oceanological Studies
|
1993
|
issue 64/3
187-195
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