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Fig. 1

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Study area. A − hydrological network (rivers and lakes), B − the Wieprz-Krzna Canal, C − national border, D − storage reservoir (R1, R2, R3), E − lake (D − the dystrophic Lake Moszne, M − the mesotrophic Lake Piaseczno, M/E − the meso-eutrophic Lake Skomielno, E − the eutrophic Lake Głębokie) for comparison.