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Escherichia coli survival in the water from the Gulf of Gdansk under laboratory conditions

100%

Krolska M. , Latala A. , Michalska M. , Nowacki J. , Sobol Z.

Oceanological Studies

1997

tom 26

nr 4

133-143

Faecal coliform bacteria (among others Escherichia coli) are routinely used in monitoring of water areas (first of all seaside resorts). Their occurrence indicates recent pollution by municipal sewage. Survival of these bacteria in the sea water depends on the complex of biological, chemi-cal and physical water parameters. There are many conflicting opinions on bacterial death-rate and the data on this phenomenon for the Gulf of Gdansk are rather scarce. The influence of irradi-ance (0-200 mumol photon m-2 s-1), temperature (5-20 ?C) and salinity (0-7.5 psu) on the survival of Escherichia coli strain K-12 has been investigated. The bacterial cultures were incubated for three days under chosen temperature, salinity and irradiance conditions. Experiments were planned based on the factorial design (method x'). The cell density was determined every day by direct viable count on agar plates. The obtained results were analysed statistically in such a way that temperature, salinity and irradiance were independent variables whereas Escherichia coli number and mean mortality coefficient (Km) were the dependent ones. It was found that the effect of salinity (in studied range from 0 to 7.5 psu) on Escherichia coli survival was not statistically significant. However, the survival was strongly correlated with temperature and irradiance. Correlation coefficient (R) between temperature and irradiance and mean coefficient of Escherichia coli mortality (Km) equalled 0.801. This dependence can be described by a function, obtained from nonlinear regression analysis, Km = 6.466 - 0.195 t + 2.215?10-7 t2 i2. The function will be used for the development of a model of matter circulation and energy flow in the Gulf of Gdansk.

The metazoa parasites of gobiids in the Dniester estuary (Black Sea) depending on water salinity

100%

Kvach Y.

Oceanological and Hydrobiological Studies

2004

nr 3

47-56

A list is presented of metazoan parasites that infect seven gobiid fishes (the toad goby Mesogobius batrachocephalus, monkey goby Neogobius fluviatilis, racer goby N. gymnotrachelus, bighead goby N. kessleri, round goby N. melanostomus, ratan goby N. ratan, and syrman goby N. syrman) from the Dniester Estuary (Black Sea). Infections by thirteen species of metazoa parasites, including four trematodes, three cestodes, five nematodes, and one crustacean species, were observed in the gobies sampled from the estuary. The data complements the existing list of parasite species that inhabit the fishes of this aquatic basin. Water salinity varies in the estuary, which impacts parasite distribution. Brackish-water parasites prevailed in the Dniester Estuary, while the marine trematode C. lingua occurred only in the southern part.

Selected properties of the coastal waters of the Gulf of Gdansk (autumn 1994 and summer 1995)

88%

Witkowska K. , Dubrawski R.

Oceanological Studies

1998

tom 27

nr 4

11-21

Results of investigations on the physical and chemical properties (transparency, temperature, salinity, total nitrogen and phosphorus contents) of the Gulf of Gdansk near-shore waters carried out in autumn 1994 (September - October) and summer 1995 (June - July) are presented. Spatial and seasonal variability of water properties and environmental conditions were determined. The results obtained point to the steady degradation of near-shore environment, the range of which is slowly extending further into the water body.

Effect of salinity, temperature and light on growth of Anabaena flos-aquae and Nostoc sp. div. (cyanobacteria, blue-green algae)

75%

Plinski M. , Dziopa M.

Oceanological Studies

2001

tom 30

nr 1-2

13-19

Two species of blue-green algae have been studied under laboratory conditions in several combinations of salinity (0, 8, 16, 24 PSU), light (20, 70, 120, 170 muE m^-2 s^-1) and temperature (20, 25, 30, 35 ?C). Temperature within the range of 30-35 ?C and light intensity of 170 mE m^-2 s^-1 were the optimum to achieve a maximum growth effect in the two species examined. Salinity as an environmental factor showed that these two tested species are fresh water in origin with some tolerance to increased salinity concentration. The best growth rate for Anabaena flos-aquae was stated in 0 PSU medium for all temperature and light conditions. For Nostoc sp. div. medium with 8 PSU was the optimum one.