Zarastanie i zanikanie najmniejszych jezior na Niżu Polskim
Disappearance and overgrowth of the smallest lakes in Poland

Summary/Abstract: The study continues the authors’ research on the processes of surface reduction and overgrowth in lakes located in the Polish Lowlands. The analysis encompassed 590 lakes with a surface area of up to 100 hectares. Data on the disappearance and overgrowth of these lakes were derived from materials provided by the Inland Fisheries Institute in Olsztyn for the years 1958–1968, as well as orthophotomaps from 2010–2012 obtained from the Central Center for Geodetic and Cartographic Documentation. The objective of this study was to compare the data from these two sources to assess changes in lake surface area and the degree of overgrowth by emergent vegetation among Poland’s smallest lakes over the past 50 years. The results revealed that the total surface area of the 590 lakes decreased by 634.8 hectares, equivalent to 11.62%. Additionally, the overgrowth coefficient increased by 0.6%.

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