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1
Content available remote Abundance and production of bacteria in a marine beach (Southern Baltic Sea)
Podgórska B., Mudryk Z., Skórczewski P.
Polish Journal of Ecology
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2008
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Vol. 56, nr 3
405-414
EN
The paper presents the results of the study of abundance, biomass, mean cell volume and secondary production of bacteria inhabiting a marine-bay sandy beach, at southern Baltic Sea coast (Sopot) in summer season. The differences of bacteriological parameters among sites across beach horizontal profile were determined. Maximal value of the total bacteria numbers (8.59 [plus or minus] 0.73 x 10[^7]cells g[^-1] dw), biomass (15.2 [plus or minus] 4.4 [my]g C g[^-1] dw) and cell volume of bacterium (0.056 [plus or minus] 0.011 [my]m3) was noted at the waterline and bacterial secondary production was highest in the dune (172.3 [plus or minus] 86.6 [my]g C g[^-1] dw d[^-1]) and at the waterline (119.9 [plus or minus] 40.5 [my]g C g[^-1] dw d[^-1]). Marked differences in the level of bacteriological parameters between surface and subsurface sand layers were estimated. In the sea, at the waterline and in the middle of the beach higher numbers of bacteria, their biomass and secondary production were found in the surface (0.1 cm) than in the subsurface (5.10 cm) sand layers. A reverse situation was observed in the dune.
2
Content available remote Spatial variability in the activity of hydrolytic enzymes in a marine beach (Southern Baltic Sea)
Mudryk Z., Podgórska B.
Polish Journal of Ecology
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2005
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Vol. 53, nr 2
255-260
EN
Potential activity of hydrolytic microbial extracellular enzymes were determined in a sandy beach in Sopot, (Southern Baltic Sea) in July 2001. Among of the five monitored enzymes, the highest level of activity (314,28 nM MCA g-1d.w.h-1) was determined in the aminopeptidase whereas chitinase had the lowest level (0,50 nM MUF g-1d.w. h-1) of potential activity. Usually, the ranking of the activity rates of the assayed enzymes was following: aminopeptidase > lipase > β-glucosidase > α-glucosidase > chitinase. Clear gradients in the level of enzymatic activity were determined in horizontal profile of the beach. The maximum activity of studied enzymes was recorded in sand collected under seawater and at the waterline.
3
Content available remote Generic composition and respiratory activity of heterotrophic bacteria of marine sandy beach (Southern Baltic Sea)
Mudryk Z., Podgórska B.
Polish Journal of Ecology
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2005
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Vol. 53, nr 1
97-103
EN
In the bacterial community occuring in a sandy marine beach (region of the Gdańsk Gulf, Southern Baltic Sea), bacteria of the genera Acinetobacter and Microoccocus predominated among 230 isolated strains. Bacteria strains of the genera Alteromonas, Bacillus, Cytophaga, Erwinia and Prostheocomicrobium contributed in a small percent. The measurements of respiratory activity revealed that casein hydrolyzate was the most actively metabolised respiratory substrate while sodium pyruvate and cellobiose were oxidised less actively. The intensity of utilization of respiratory substrates by bacteria in the whole perpendicular profile of the beach was alike. They were more intensive in the surface (0 . 1 cm) than in the subsurface (5 . 10 cm) sand layers.
4
Content available remote The dependence between bacterial production and environmental conditions in the Gulf of Gdańsk
Ameryk A., Podgórska B., Witek Z.
Oceanologia
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2005
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No. 47 (1)
27-45
EN
Bacterial production, primary production and a number of other environmental factors were measured during six cruises in the Gulf of Gdańsk conducted in various seasons from 1995 to 2001. Bacterial production (BP) in the epipelagic layer ranged from 1.5% (April) to 80% (July) of the gross primary production (PP). Significant differences were observed between the BP/PP ratios in estuarine and open-water areas. The highest values were recorded in the coastal area and near the mouth of the river Vistula. It suggests that allochthonous organic matter has a great influence on BP. The correlations between particular parameters and regression analyses indicated that BP in the Gulf of Gdańsk depended on temperature, organic nitrogen concentration, PP, chlorophyll a concentration, organic phosphorus concentration, salinity and biochemical oxygen demand. Of all the independent variables, the temperature had the greatest impact on BP (R2 = 0.62). There was an inverse parabolic relationship between bacterial production and temperature. It appears that above a temperature of 12°C bacterial production depended on substrates to a higher degree than on temperature. The negative correlation between BP and concentrations of mineral nitrogen and phosphorus in the annual cycle were probably due to an indirect dependence. A multiple regression equation, which included temperature and organic phosphorus concentrations, explained 78% of the variation in BP.
5
Content available remote The occurrence and activity of sulphate-reducing bacteria in the bottom - sediments of the Gulf of Gdańsk
Mudryk Z. J., Podgórska B., Ameryk A., Bolałek J.
Oceanologia
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2000
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No. 42 (1)
105-117
EN
The paper presents the results of investigations concerning the number, distribution and physiological activity of sulphate-reducing bacteria (SRB) inhabiting the bottom sediments of the Gulf of Gdansk. The numbers of this group of bacteria range between 0.76 x 103 and 1.27 x 104 cells per g wet sediment. The bacterial sulphate reduction rate in bottom sediments of this area of the Baltic Sea varies from 1.89 to 31.6 nM SO42– g-1 24 h-1. The numbers of SRB and their physiological activity were subject to considerable seasonal fluctuations, maximum values being noted in summer (June) and minima in spring (April). A direct relationship has been found between the number of SRB and hydrogen sulphide concentrations; there is, however, no such relationship with reference to sulphate concentrations. The numbers and distributions of SRB demonstrated considerable variation in a depth profile of bottom sediments. SRB inhabiting the bottom sediments of the Gulf of Gdansk were able to use three different organic substrates (lactate, acetate, propionate) as electron donors and as carbon and energy sources.
6
Content available remote The abundance, biomass and production of bacterioplankton in the Pomeranian Bay
Ameryk A., Mudryk Z., Podgórska B.
Oceanologia
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1999
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No. 41 (3)
389-401
EN
A microbiological investigation was carried out in the Pomeranian Bay in 1996-1997 to determine the spatial and seasonal changes in the numbers, biomass and productivity of bacterioplankton. Substantial differences in the spatial distribution of bacterioplankton populations were found. At the stations in the coastal zone of the Pomeranian Bay numbers, biomass and production of bacteria were high, with maximum values noted at the mouth of the river Swina. This is indicative of the significant impact of riverine waters on the bacterioplankton in the Pomeranian Bay. Seasonal fluctuations and bacterial microflora activity were recorded. The dynamics of the changes showed that most of the bacteriological parameters examined reached their maximum in summer while minimum values were noted in winter.
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