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Fig. 4

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Values of hydrological and chemical parameters of the water (see Materials and methods section for codes) at four sampling sites (SK1, SK2, SK3 and SK4) along the Skrapež River measured in spring (April) summer (July), autumn (October) and winter (January). Statistically significant difference (P < 0.05) of values of abiotic parameters at downstream localities compared to the values at the control locality (SK1) is marked with an asterisk (*), and compared to the values at SK2 locality with a plus (+).