Position of Plitvice Lakes NP in Croatia. (b) Sampling sites in Plitvice Lakes NP. 1: Spring of the Bijela rijeka (SBR), 2: Upper reach of the Bijela rijeka (URBR), 3: Spring of the Crna rijeka (SCR), 4: Middle reach of the Crna rijeka (MRCR), 5: Lower reach of the Crna rijeka (LRCR), 6: Tufa barrier Labudovac (TBLB), 7: Tufa barrier Kozjak-Milanovac (TBKM), 8: Tufa barrier Novakovića Brod (TBNB), 9: River Korana in village of Korana (RK), 10: Plitvica stream (PS). ^*Sites from 6 to 8 are also presented in lateral profile because they are located at barriers between adjacent lakes.