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Map of sampling locations in Poland. The names of lakes or of towns, in which the studied water bodies were located, are marked with numbers: (1) Robruch; (2) Kąkolewice; (3) Urwitałt 17; (4) Urwitałt 16; (5) Woszczele; (6) Oracze; (7) Kudrynki; (8) Wojnowce; (9) Kiełpińskie Lake; (10) Warszawa, Moczydło park; (11) Izdebno Nowe; (12) Izdebno Kościelne; (13) Solec; and (14) Łysaków.
