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1

Influence of limited water flow in a pipeline on the nutrients budget in a lake restored by hypolimnetic withdrawal method

100%
Dunalska J.
Polish Journal of Environmental Studies
|
2002
|
tom 11
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nr 6
The study object was Lake Kortowo, restored since 1956 by withdrawing nutrient-rich hypolimnion water directly to the outflow by means of a pipeline. The studies were carried out after limiting the water flow in the pipeline from 0.25 m3·s-1 to 0.05 m3·s-1. The nutrients budget analysed in detail for the period of the pipeline operation was later compared to the theoretical budget with a surface outflow only. The maximum reduction of nutrients, and phosphorus in particular, was noted in the second half of summer stagnation when the pipeline was operating. Negative phosphorus accumulation in the summer months was the result of a balanced removal of hypolimnion water through the whole summer stagnation.
2

Culturable proteolytic bacteria and the activity of leucine aminopeptidase in river ecosystem

80%
Skorczewski P., Mudryk Z. J.
Polish Journal of Ecology
|
2009
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tom 57
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nr 3
561-565
The study determined the numbers and distribution of culturable heterotrophic and proteolytic bacteria and the level of leucine aminopeptidase activity in the water of the Słupia River within the town of Słupsk (Northern Poland). River Słupia is 138.6 km long and flowing into the Baltic Sea. The average water discharge of the river is 15.5 m³ s⁻¹ and its slope is about 1.3% which gives it a mountainous character. The numbers of culturable heterotrophic bacteria was determined on iron-peptone agar (IPA) medium and the numbers of culturable proteolytic bacteria was assayed in IPA medium enriched with gelatin. Potential leucine aminopeptidase activity was carried out with the use of fluorescently labelled model substrate MCA-leucine. The numbers of heterotrophic bacteria ranged between 0.33 to 183.0  10³ cells cm⁻³ (maximum in spring, minimum in winter); the abundance of culturable proteolytic bacteria ranged 0.50 to 31.8  10³ cells cm⁻³ and the maximum was noted in spring, the lowest in summer. The activity of extracellular leucine aminopeptidase ranged from 2.34 to 6.87 μM MCA dm⁻³ h⁻¹ and the highest value was noted in spring while the lowest were noted in winter and summer. The values of bacteriological parameters and of leucine aminopepidase activity tended to be higher below the sewage treatment plant. The bacteriological parameters for River Słupia were compared with the relevant data for other river ecosystems.
3
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Preliminary characterization of the trophic state of Maly Kopik Lake near Olsztyn and its drainage basin as a supplier of biogenic substances

70%
Grochowska J., Tandyrak R.
Journal of Elementology
|
2008
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tom 13
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nr 1
The study was carried out on a small (7.8 ha) and shallow (9.0 m) lake Mały Kopik, situated 9 km on south western from Olsztyn, drainage basin of Giłwa and Pasłęka rivers. The catchment area of the lake is 194.7 ha. Forests cover the most of the drainage basin area (64.2%), agriculture land comprises 28.7% (21% grass land and 7.7% arable land) and urban land - 7.1%. Lake Mały Kopik is not susceptible to degradation (III category), and drainage basin having a great potential for supplying matter to the reservoir, was included in basin category 4. The lake with its drainage basin belong to the 4th type of lake-drainage basin ecosystems. In such a system the natural eutrophication of the lake is expected to proceed at a fast rate. As evidenced in the study, lake Mały Kopik is highly eutrophic reservoir. The lake waters were characterized by a high content of nutrients, up to 0.673 mg P·dm-3 and 10.61 mg N·dm-3. The high fertility of the lake was exhibited also by the values of BOD5 reaching 7.5 mg O2·dm-3, chlorophyll a content - 50 µg·m-3, and low water transparency - 2 m.
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