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4 Oceanological Studies

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Activity of heterotrophic bacterai isolated from the surface microlayer and subsurface water in the Southern Baltic

100%

Mudryk Z. , Korzeniewski K.

Oceanological Studies

1995

nr 69/10

45-57

The abundance of heterotrophic bacteria in the surface microlayer and subsurface water as well as the rates of processes of organic matter decomposition by multi-species populations of bacterioneuston and bacterioplankton of the Southern Baltic have been determined.The number of heterotrophic bacteria in the surface microlayers was found to be 2 to 11 times greater than in the surface water.The significant differences in the rate of bacterial destruction of individual organic compounds have been shown.It has been also found out that simple organic compounds were mineralized more actively by bacterioneuston while macromolecules by planktonic bacteria.

Microbiological transformation of organic matter in estuarine basins of the Polish coast.I.Decomposition of organic matter and heterotrophic activity of bacterioplankton in estuarine lakes

100%

Mudryk Z. , Korzeniewski K.

Oceanological Studies

1995

nr 69/10

3-16

The rate of organic matter decomposition, the abundance of heterotrophic bacteria, production of bacterial biomass and coefficients of heterotrophic activity of bacterial microflora have been determined for three estuarine lakes.Processes of organic matter destructions, biomass production as well as heterotrophic activity of bacteria displayed marked seasonal fluctuations.The highest rate of the processes studied was observed in heterotrophic lake Jamno and considerably lower in eutrophic lakes Lebsko and Gardno.The data gathered in the course of three-year-long research programme revealed the increasing rate of eutrophication processes in the aquatic basins investigated.

Distribution and activity of proteolytic bacteria in the surface and subsurface water layers in the region of the Gdansk Deep

100%

Mudryk Z. , Donderski W.

nr 4

3-17

The abundance and proteolytic activity of bacteria inhabiting the surface microlayers and subsurface water in the region of the Gda?sk Deep have been determined. Proteolytic bacteria occurred in large numbers, making up 60-100% of the total number of strains in the water layers investigated. Bacteria inhabiting the subsurface water layer displayed the highest mean activity of enzymes catalysing protein decomposition processes. The considerable impact of temperature, pH and salinity on protease activity was noted.

Effect of some heavy metals on neustonic and planktonic bacteria isolated from the Deep of Gdansk

61%

Mudryk Z. , Donderski D. W. , Donderski W. , Skorczewski S. P. , Skorczewski P. , Walczak W. M. , Walczak M.

nr 1

89-99

The effect of different concentrations of heavy metal ions Hg+2, Cd+2, Zn+2, Cu+2 on growth and respiratory activity of neustonic and planktonic bacteria derived from the Deep of Gda?sk was studied. The laboratory experiments demonstrated that all heavy metals examined exhibited toxic effects on the development and oxygen uptake by neustonic and planktonic bacteria. This effect depended on the kind of the metal and its concentration.