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Utilization of carbohydrates by planktonic bacteria isolated from estuarine lakes

100%

Donderski W., Mudryk Z.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 3

Studies were carried out on the utilization of various carbohydrates by planktonie bacteria isolated from the estuarine lakes Łebsko, Gardno and Jamno. The most actively utilized carbohydrates were glucose, fructose, lactose and saccharose; the least active was rhamnose. Pronounced seasonal variability in the utilization of carbohydrates was found. However, no significant differences were found at the particular research stations.

2

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Abundance and productivity of estuarine neustonic and planktonic bacteria

86%

Mudryk Z., Skorczewski P.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2007

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tom 11

The paper presents the results of the study of abundance and secondary production of neustonic and planktonic bacteria inhabiting estuarine Lake Gardno. The obtained data indicate that numbers of bacterioneuston were only slightly higher than of bacterioplankton. The rate of secondary production of bacteria was higher in the film layer than in the surface layer and subsurface water. Bacterial abundance and production were changing with seasons. Differences among studied bacteriological parameters were determined among sites across Lake Gardno.

3

Enzymatic activity and degradation of organic macromolecules by neustonic and planktonic bacteria in an estuarine lake

86%

Mudryk Z. J., Skorczewski P.

Polish Journal of Ecology

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2006

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tom 54

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nr 1

Neustonic (film layer ~ 90 µm, surface layer ~ 240 µm) and planktonic bacteria (subsurface layer ~ 10–15 cm) participating in the processes of decomposition of organic macromolecular compounds, and their potential capability to synthesise extracellular enzymes were studied in a shallow estuarine lake (Lake Gardno – Baltic coast). The studied bacteria were capable of decomposing a wide spectrum of organic macromolecular compounds. Most bacteria inhabiting surface and subsurface water layers hydrolysed lipids, proteins and DNA. The microflora hydrolysing cellulose was represented by the least abundant group of organisms. Of the studied enzymes, alkaline and acid phosphatases, leucine arylaminase, esterase, and esterase lipase were synthesised most actively while β-glucouronidase (βGl) and α-fucosidase (αFu) were synthesized least actively. It can be clearly seen that enzymatic activity was stratified, and there were differences between studied water layers. Bacterial strains isolated from surface and subsurface layers were more active in synthesizing extracellular enzymes than bacteria inhabiting the film layer. Bacteria isolated from various parts of Lake Gardno synthesized the tested hydrolytic enzymes with a similar intensity.

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Air-water interface in an estuarine lake: chlorophyll and nutrient enrichment

72%

Antonowicz J. P.

Polish Journal of Ecology

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2018

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tom 66

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nr 3

The surface water microlayer (SML) is a thin layer found at the interface of the hydrosphere and the atmosphere. It is capable of accumulating chemical substances and microorganisms at a rate as high as 100-fold greater than that observed in the subsurface water. The rate of accumulation of biogens and chlorophyll a in SML of an estuary, where marine and fresh waters mix, varies considerably and it depends on the degree mixing of these waters, which is manifested in the varying values of the enrichment factor (EF, calculated as the ratio of nutrients concentration in SML versus subsurface water). The influence of the Baltic Sea marine water and the freshwater Łeba River inflows on the estuarine Lake Łebsko (Poland) was examined. Nine sampling sites were located in the estuary. Water samples were collected from two layers: the surface microlayer (thickness 242 µm ± 40) and the subsurface water (15 cm depth). The capacity of the SML to enrich the water in nutrients and chlorophyll differed among various parts of the estuary, as well as between seawater and river waters. Statistically significant higher EF were found in the marine waters than in river waters for the nitrogen and phosphorus compounds as well as chlorophyll. There were also differences in EF between marine and lake waters. The highest EF were also recorded for organic forms of nitrogen and phosphorus in marine water. Most probably, marine flux into the estuarine Lake Łebsko, resulted in the increased EF for these investigated components.

5

Ecological analysis of fishing in estuary lakes, Gardno and Wicko, in the years 1952-1991

72%

Orzechowski B.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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1997

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tom 01

6

Antibiotic resistance among bacteria inhabiting surface and subsurface water layers in estuarine Lake Gardno

72%

Mudryk Z. J.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 4

Antibiotic resistance of heterotrophic bacteria isolated from the surface and subsurface water of estuarine lake Gardno was determined. The levels of resistance of bacteria to various antibiotics differed considerably. Antibiotic resistance between neustonic and planktonic bacteria and microflora inhabiting different parts of lake Gardno was nearly identical. Besides gentamycin, no differences in the antibiotic resistance between pigmented and non-pigmented bacteria were noted. Majorities of bacterial strains were characterised by resistance to 4-6 antibiotics. Bacterial resistance to antibiotics was dependent on chemical structure.

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Nitrogen and phosphorus in surface microlayers of an estuarine, shallow lake [North Poland]

72%

Trojanowski J., Trojanowska C., Antonowicz J.

International Journal of Ecohydrology and Hydrobiology

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2001

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tom 01

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nr 4

Higher nutrients concentrations were observed into the surface microlayer then in the subsurface of estuarine, shallow lake water. The thinner the surface microlayer, which means the closer it is to the water-atmosphere contact zone, the higher are concentrations of organic and inorganic phosphorus, as well as organic and ammonia nitrogen. Mean values of enrichment coefficients were usually positive. The highest values of these coefficients were found for organic phosphorus and organic nitrogen in relation to phosphates, ammonium nitrogen and nitrate nitrogen.

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The importance of ciliates as a trophic link in shallow, brackish and eutrophic lakes

58%

Rychert K., Wielgat-Rychert M., Szczurowska D., Myszka M., Bochynska M., Krawiec K.

Polish Journal of Ecology

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2012

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tom 60

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nr 4

The importance of ciliates as a trophic link, which is defined as a fraction of the energy bound by primary producers that is transferred through the ciliate community, was assessed in the pelagic zones of shallow, eutrophic, and estuarine lakes. The study was conducted in Lake Gardno and Lake Łebsko located in northern Poland. Each of these lakes is characterized by very high mean annual ciliate biomasses of 115 μg C -1 (Lake Gardno, April 2006 – April 2007), 107 μg C L-1 (Lake Gardno, February 2007 – February 2008), 85 μg C L-1 (Lake Łebsko, April – November 2007), and 127 μg C L-1 (Lake Łebsko, April – September 2008). Ciliate production was estimated using allometric equations and was compared to primary production measured with the light-and-dark bottles method. Annual, depth-integrated ciliate secondary production corresponded to 9 and 11% (Lake Gardno, two consecutive years studied) and 12% (Lake Łebsko, the same value for two growing seasons studied) of primary production. These values exceed the majority of other estimates in the literature, which indicates the high importance of ciliates in such highly-productive, shallow lakes.

9

Biomass dynamics of fishing in estuarine lakes Lebsko and Sarbsko

58%

Orzechowski B., Obolewski K.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2008

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tom 12

The research has shown the domination of fluctuative trends in the biomass dynamics for a major-ity of the caught fish species and decrease in the stocks of littoral phytophil fish. The main reason of the fishery breakdown of the pike perch in Łebsko and perch in Sarbsko was exploitation at a too big scale. The resources of the mentioned fish populations were drastically violated in the first decade of the 47 years of exploitation, that is in the years: 1952-1999. However, the highest fishing level of most of the fish species in annual cycles was achieved notoriously at spawning pe-riods during the whole 47 years. It just goes to show a complete ignorance of valid periods and the protective dimensions in the fishery practice. In the consecutive decades and for all the 47 years, the position and the degree of mass dominance for separate species of fish in fishing have been es-tablished. Pairs of superdominants and eudominants with the greatest quantitative participation in fishing have been distinguished for each of the lake. For the regeneration of the pike’s, the tench’ and the crucian carp’ population fishing of those species should be banned for the time of their generation. Reduction to small Cyprynidae species should be conducted by intensive stock in Łebsko with the pike and in Sarbsko with the pike-perch.

10

Chemical and bacteriological studies of surface and subsurface water layers in estuarine Lake Gardno

58%

Mudryk Z. J., Trojanowski J., Antonowicz J., Skorczewski P.

Polish Journal of Environmental Studies

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2003

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tom 12

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nr 2

This paper presents results of chemical and bacteriological examinations of surface and subsurface water layers of estuarine lake Gardno. The obtained data indicate that there are substantial differences in chemical compound concentrations and also bacteria number and activity between the water layers under investigation. Particularly great differences between microlayers and subsurface water refer to concentrations of organic phosphorus and nitrogen. It was found that bacteria number was greater in surface water layers than in subsurface water. Significant differences among the studied chemical and bacteriological parameters were revealed between particular sites across lake Gardno. The number of freshwater, brackish and marine bacteria in the water of lake Gardno was up to chlorides concentration.

Ograniczanie wyników

Utilization of carbohydrates by planktonic bacteria isolated from estuarine lakes

Abundance and productivity of estuarine neustonic and planktonic bacteria

Enzymatic activity and degradation of organic macromolecules by neustonic and planktonic bacteria in an estuarine lake

Air-water interface in an estuarine lake: chlorophyll and nutrient enrichment

Ecological analysis of fishing in estuary lakes, Gardno and Wicko, in the years 1952-1991

Antibiotic resistance among bacteria inhabiting surface and subsurface water layers in estuarine Lake Gardno

Nitrogen and phosphorus in surface microlayers of an estuarine, shallow lake [North Poland]

The importance of ciliates as a trophic link in shallow, brackish and eutrophic lakes

Biomass dynamics of fishing in estuarine lakes Lebsko and Sarbsko

Chemical and bacteriological studies of surface and subsurface water layers in estuarine Lake Gardno