Physicochemical parameters (mean ± SD) of water at the surface and bottom zones of peat bog lakes.

Differences between the groups were evaluated with the t-test (p <0.05) for independent samples. Denotations: EC—conductivity, DO—dissolved oxygen, DOC—dissolved organic carbon, TOP—total organic phosphorus, TON—total organic nitrogen, N—number of samples. Significant p-values (p < 0.05) are depicted in bold italics. Asterix (*) at pH denotes median value.