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Measurements of physico-chemical parameters (temperature, transparency, oxygen, phosphorus, nitrogen and chlorophyll concentrations) made in summer periods in 25 lakes of Suwałki Landscape Park (north-eastern Poland) have shown that according to Polish and foreign classifications the majority of them are meso or meso-eutrophic, especially deep and/or big lakes like Hancza, Szurpiły, Szelment Wielki, Jeglówek, Kopane, Perty, Jaczno, Kamenduł, Kojle. Generally, archival documents of SLP lakes show that the big and deep lakes (Hańcza, Szelment Wielki) do not show sings of advanced eutrophication. Whereas in shallow through flow lakes the transparency of waters decreased over the last several tens of years. In the majority of lakes phosphorus accumulation in the waters above the bottom observed in summer was not related directly to oxygen deficit.
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Projects co-financed by:
Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.