In the Sucha Woda stream the content of chlorophyll ɑ in the periphyton changed along the course of the stream, the lowest being found in the high mountain part and the highest in the middle part of the stream. In spite of significant differences in the insolation of the stream in its middle part, light did not significantly affect the chlorophyll ɑ content in the attached algae, mosses, or the concentration of organic components in the algal envelopes. A positive correlation between the chlorophyll ɑ content in the periphyton and N-NO3, and a negative one between the water temperature and pH were shown. A significant effect of the water level on the concentration of chlorophyll ɑ in the algae was observed.
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