![]() Although the outflowing waters still transported a high content of chlorophyll a and suspended solids during SR, their amount was lower (34.5 μg L −1 and 17 mg L −1, respectively) than that during BR and LR. During LR, decrease of phosphorus concentration still occurred (0.11 mgP L −1), but nitrogen concentration slightly increased (3.9 mgN L −1). The decline at the outflow was the result of a better quality of water at the tributaries and SR in the lake. ![]() The nutrient concentrations at the inflows decreased over the years due to the improvement of water and sewage management in the catchment (in Mielcuch from 18.0 to 8.0 mgN L −1 and 1.0 to 0.6 mgP L −1). Physico-chemical parameters were analysed monthly at five stations. The quality of water inflows, lake and outflow was compared before (BR), during sustainable (SR, deep water aeration, phosphorus inactivation and biomanipulation for 3 years) and limited lake restoration (LR, only aeration for 2 years). To fill the knowledge gap about the functioning of the lake–river system subjected to restoration treatments, two tributaries, a shallow, restored lake and its outflow, were examined. ![]()
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