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Mycological analyses were carried out on air samples collected with the sedimentation and impactor methods. Fungi were assayed in atmospheric air sampled in the city centre of Olsztyn and in the forest at Lake Kortowskie. The experiment aimed at evaluating the contamination of atmospheric air with fungal microflora in the city centre of Olsztyn (3 stations) and in the forest at Lake Kortowskie (one...
This study addressed the feeding of sexually mature perch (Perca fluviatilis L.) in Lake Kortowskie in the autumn-winter period (October-March). A total of 81 perch specimens were caught, of which 20.2% were males, 69.1% females, and 7 specimens were of unidentified sex. The composition of the perch diet was very diversified. The food contained zooplankton, insect larvae, fish, and other components...
Lake Kortowskie was studied during water stagnation, when it is subjected to bottom water withdrawal to outflow through a pipeline. The examinations were carried out after flow reduction from 0.25 m3· s-1 to about 0.05 m3· s-1. It has been revealed that hypolimnion withdrawal has much more effect on the temperature and oxygen content in the water body. Destruction of the thermal settings and the rate...
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...
The parasites of bream from the reclaimed Lake Kortowskie were comprised of 16 species belonging to Protozoa, Monogenea, Digenea, Cestoda, Acanthocephala, Nematoda, Crustacea and Molusca. Some parasites were found only on single host specimens (Trichodina sp., Gyrodactylus sp., Ichthyocotylurus platycephalus met., Glochidium larj. The other species (Dactylogyrus auriculatus, Phyllodistomum elongatum,...
Lake Kortowskie is restored by the hypolimnetic withdrawal method: rich in nutrients near-bottom waters are removed by a pipeline directly to the outflow instead of the natural outflow of surface waters. It has been found out that the amount of water discharged through the pipeline and therefore the amount of removed phosphorus depends on the surface inflow. The water balance of the lake in summer...
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