<abstract xmlns="http://www.w3.org/1999/xhtml">

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 <italic>a</italic>, 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.
</abstract>

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 a, 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.

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

Oceanological and Hydrobiological Studies

The national monitoring network of benchmark lakes consists of ten lakes situated in different Polish lakelands. They do not receive wastewater from point...

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

Published Online: Jun 30, 2010

Page range: 153 - 159

DOI: https://doi.org/10.2478/v10009-010-0029-1

Keywords
lake monitoring, eutrophication indices

This content is open access.

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

Published Online: Jun 30, 2010

Page range: 153 - 159

DOI: https://doi.org/10.2478/v10009-010-0029-1

Keywordslake monitoring, eutrophication indices

This content is open access.

Keywords
lake monitoring, eutrophication indices