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Sustainable restoration using three methods – water aeration, phosphorus inactivation, and biomanipulation – was applied in Swarzędzkie Lake to slow progressive eutrophication. The treatments were limited to wind aeration alone after three years of restoration as a result of lack of funding. The research was carried out in a period of limited restoration. Phytoplankton was sampled monthly from the...
Our paper reports the phyto- and zooplankton changes studied in Lake Uzarzewskie in 2010-12 under the influence of a restoration procedure. It is a small (10.6 ha), not deep (up to 7.3 m) but thermally stratified, natural, kettle-shaped lake fed with waters from the Cybina River. Water of the tributary rich in nutrients was responsible for the hypertrophic state of the lake. To improve the condition...
In summer 2007 water samples were collected in three lakes situated in the region of the Great Mazurian Lakes (northeastern Poland) displaying different types of catchment area: Lake Niegocin, Lake Piłwąg and Lake Rekąty. The main objective of this study was to analyze the difference in species composition of cyanobacteria and to determine the concentration of cyanotoxins. Potentially toxic species...
The aim of this study was to determine the microbiological quality of runoff from an urban area with different catchment land use flowing into the Cybina River in Poznań, Poland. Water samples were taken from October 2009 to March 2011 at five research stations situated at the outlets of sewers draining a road surface, a car park, and residential and industrial areas. Microbiological analyses included:...
Sediments, being the most important source of phosphorus (P) in the shallow (max. depth 7.2 m), polymictic Swarzędzkie Lake during the summer, were thoroughly studied in laboratory experiments with intact cores sampled at 7 stations in four seasons of the year. Under anaerobic conditions P release rates peaked in the samples from the deepest part of the lake at 26.86 mgP m⁻²d⁻¹. However, the highest...
The effect of two different reservoirs on some parameters of river water quality has been studied. The Antoninek Reservoir (wetland-type, mean depth 0.4 m, area 7.2 ha, mean residence time 0.5 day) and the Maltański Reservoir (also not stratified but plankton-type, mean depth 3.1 m, area 64 ha, mean residence time 34 days) are situated on the same river (mean discharge 0.67 m³ s⁻¹). Water of this...
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