engleski

Periphyton and its role in tufa deposition in karstic waters (Plitvice Lakes, Croatia)

In order to investigate the role of algae in the process of tufa deposition in the Plitvice Lakes National Park, qualitative and quantitative analyses of periphyton were carried out. Monthly, from 1985-1990, research was performed on seven sampling sites. Simultaneously with the analysis of periphyton, the morphometric measurements of the crystalline calcite precipitation have been done. The connection between carbonate deposition and periphyton was tested by exposure experiments (microscope slides). Glass slides were submerged in stream water and exposed for 30, 60, and 90 days. Seven locations with different intensity of natural tufa deposition were chosen along Plitvice Lakes. Simultaneously, water temperature, current velocity, the concentration of H+ ion, the degree of water saturation with CaCO3 and the concentration of dissolved organic matter were monitored. Growth of periphyton was analysed, and 191 species were determined with Bacillariophyceae (139) as a dominant group.

calcite deposition; glass slides; periphyton; Plitvice Lakes; Croatia

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