Měkýši poklesových kotlin na Karvinsku

Abstract

The thesis assesses water-filled subsidence basins in the Karviná region using ecological and faunistic characteristics, with freshwater molluscs as bioindicators. Two sites – Kozinec subsidence lake and Doubravské basins – differing in size, salinity, and vegetation, were examined. A malacological survey identified 16 mollusc species, with invasive species dominating Kozinec due to high salinity from mine water discharge, while native species prevailed in Doubravské basins. The study analyzed the impact of shoreline zones on mollusc communities, measured physicochemical water parameters (e.g., salinity, pH, nitrites), and evaluated anthropogenic influences. Proposed measures include raising the dam to prevent salinization of Kozinec’s isolated section, supporting ecological succession, and protecting littoral zones, highlighting the potential for revitalizing post-mining sites.