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Changes of water quality in benchmark lakes in the Polish national monitoring network in the 1999-2004 period

Soszka H., Kolada A., Gołub M.

Oceanological and Hydrobiological Studies

2010

Vol. 39, No.2

153-159

The national monitoring network of benchmark lakes consists of ten lakes situated in different Polish lakelands. They do not receive wastewater from point sources of pollution and their catchment areas are predominantly forested. Changes in their water quality should be natural or almost natural due to very low anthropogenic pressure. In the majority of the benchmark lakes the values of eutrophication parameters during the 1999-2004 period did not exceed 0.060 mg dm^-3 P for total phosphorus or 10 μg dm^-3 for chlorophyll α, and Secchi disc readings generally exceeded 2.5 m. Trend analyses in the majority of cases did not reveal significant changes in eutrophication parameters over time.

Establishing reference conditions for Polish lakes - preliminary results

Soszka H., Kolada A., Gołub M., Cydzik D.

Oceanological and Hydrobiological Studies

2008

Vol. 37, No.3

105-110

Establishing reference conditions is essential for performing ecological status assessments of surface waters according to the EU Water Framework Directive. Ecological status is described as the deviation from undisturbed (reference) conditions. This paper presents the process of establishing preliminary reference values for chlorophyll a, total phosphorus, and Secchi disc readings in different types of Polish lakes. This was done by selecting potential reference lakes and performing statistical analysis of the values of the main eutrophication parameters. The preliminary reference values for total phosphorus, chlorophyll, and Secchi disc depth were defined as 0.033 mgP dm-3, 3.75 ěg dm-3, and 3.6 m for stratified lakes, and 0.048 mgP dm-3, 5.80 ěg dm-3, and 2.5 m. for polymictic lakes, respectively.