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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.

Geological, geochemical and bacteriological conditions in a post- dredging pit in Puck Bay (Southern Baltic, Poland)

100%

Bolalek J. , Piekarek-Jankowska H. , Leczynski L. , Frankowski L. , Podg?rska B.

nr 3

111-122

The paper presents the results of geological and geochemical studies carried out in an artificial pit which was formed after dredging the sediments up from the bottom of Puck Bay in 1991. It was found out that fine-grained classic sediments (d50 = 0.2 - 0.08 mm) as well as a great amount of organic matter (Pilayella littoralis) were deposited in the pit. The proc-esses of organic matter mineralization brought about reducing conditions. Ammonia concen-trations in near-bottom waters were higher than in the areas surrounding the pit 191.0 mmol?dm-3 compared to 3.97 mmol?dm-3. Phosphate concentrations in the waters and sedi-ments were elevated and reached values up to 1 mmol?dm-3. Intensive processes of organic matter mineralization caused both the temporary decline in sulphate concentration in near-bottom waters down to the value of 272 mg?dm3 (almost twice lower than the average concen-tration in Puck Bay waters) as well as sulphate deficiency in interstitial water. Below the 5 - metre isobath, the concentration of hydrogen sulphide varied between 0.11 and 0.49 mmol?kg-1w.w. The total number of bacteria in 1 cm3 of near-bottom water amounted to 107 and the number of sulphate-reducing bacteria ranged from 240-46000. The number of sulphate-reducing bacteria in 1 g d.w. of surface bottom sediments was estimated as 104 to 106.