Abstract
Druzno Lake is a semi-natural, hypertrophic basin located on the Zuławy polders (delta of Vistula). Its area is 13–29 km2, with a mean depth of 1.25 m. The lake is extremely polymictic and of throughflow character: the water retention time is very short (20 days!). Almost 90% of the bottom is overgrown by macrophytes. The productivity, especially of phytoplankton, is very high. The main factors of ecosystem stability are: There are very good oxygen conditions in the lake. Organic matter undergoes quick mineralization. Due to frequent resuspension and intensive throughflow a considerable part of the mineral and organic seston is ‘exported’ out of the lake.
By dredging the navigable channel, additional amounts of suspended matter have been exported out of the system. Therefore these technical treatments slow down the processes of shallowing and aging of the lake and support the lake’s existence.
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Giziński, A., Kentzer, A., Rejewski, M. (1997). Why does Druzno Lake (Poland) still exist? On the conditions of the pond ecosystem sustainability. In: Kufel, L., Prejs, A., Rybak, J.I. (eds) Shallow Lakes ’95. Developments in Hydrobiology, vol 119. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5648-6_30
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DOI: https://doi.org/10.1007/978-94-011-5648-6_30
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