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Study sites in Poland, Central Europe: 1–Lake Czaplino (53°32′59″N, 16°14′59″E), 2–Lake Iławskie (53°35′37″N, 19°36′54″E), 3–Lake Sosno (53°20′15″N, 19°20′55″E), 4–pond in Strzemieszyce Wielkie (district of Dąbrowa Górnicza) (50°18′23″N, 19°19′24″E), 5–a bathing resort in the Valley of Three Ponds area in Katowice (50°14′32″N, 19°02′42″E).
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