The physico-chemical water characteristics and basin morphology of 10 well-preserved Pomeranian peatland lakes were examined. These are acidic (pH 3.95 – 5.99), softwater (1.5 š0.9 mg Ca dm-3), and oligotrophic water bodies. Their hydrochemical conditions differentiate them into two groups: poor (3.04 š2.77 mg C dm-3) and rich (10.36 š7.27 mg C dm-3) in organic carbon compounds. They differ in water colour (p = 0.02), humic acid concentration (p<0.001), redox potential (p = 0.007), and irradiance (PAR; p = 0.03). The hydrochemistry of the lakes is determined by their basin morphology, which affects the water colour and the concentrations of humic acids and organic carbon compounds
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