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Physiological properties of bacteria inhabiting polluted and unpolluted marine sandy beaches (Southern Baltic Sea)

Podgórska Beata, Mudryk Zbigniew Jan

Polish Journal of Ecology

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2007

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Vol. 55, nr 1

15-26

EN

The occurrence of bacteria displaying particular physiological properties was studied in polluted (Sopot) and unpolluted (Czołpino) marine sandy beaches (southern Baltic Sea). All eight isolated physiological groups of bacteria were much more numerous in polluted than in unpolluted beach. In polluted beach, bacteria hydrolyzing uric acid (32.5 cells 10[^3] g[^-1] dry w. of sand) and ammonifying bacteria (32.3 cells 10[^3] g[^-1] dry w. of sand) were the most numerous, while nitrifying bacteria were the least numerous (0.014 cells 10[^3] g[^-1] dry w. of sand). In unpolluted beach, bacteria hydrolyzing uric acid (0.66 cells l0[^3] g[^-1] dry w. of sand) and reducing methylene blue (0.18 cells l0[^3] g[^-1] dry w. of sand) were the most numerous, while no bacteria producing hydrogen sulphide from organic compounds or bacteria decomposing urea were isolated. In both beaches, considerable differentiation in the distribution of physiological groups of bacteria was found in a horizontal profile i.e. from the water-line to the middle of beach ([similar to] 60 m). Data concerning horizontal distribution of the physiological groups of bacteria in the sand of the polluted beach show that the majority of those groups was most numerous in the dune. No clear regularity in the distribution of physiological groups of bacteria was found in the horizontal profile of the unpolluted beach. Results of the present study indicate differences in the distribution of the physiological groups of bacteria in the surface (0-5 cm) and subsurface (5-10 cm) sand layers. Generally, in both studied beaches all physiological groups of bacteria were much more numerous in the surface than in the subsurface sand layer. The exception were bacteria reducing sulphates which in the polluted beach were most numerous at the depth of 5-10 cm.

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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.

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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.