Hodnocení stupně zasolení vod poklesových kotlin na základě charakteristiky malakocenóz.

Abstract

Doctoral thesis is devoted to the evaluation of salinity in flooded mine subsidences according to aquatic mollusc diversity. Chemism of water in flooded mine subsidences is significantly influenced by banks modeling, using tailings, this could result in higher values of some hydrochemical factors, such as content of dissolved substances, chlorids and sulphates – thus factors, that are related to salinity of surface waters. Higher salinity has considerable impact on biota in flooded mine subsidences – vegetation, invertebrates and also subsequently on vertebrates (amphibians, reptiles and birds). Higher values of salinity could even lead to the species liquidation (plants and animals) and to ecological status deterioration of biotop. There were chosen 10 localities for the study – flooded mine subsidences – in Karvina region. The assessment was conducted according to water chemism and aquatic malacocenosis characteristics (sampling and field study in 2010 and 2011). There were found correlations between content of total dissolved substances, chlorids, conductivity, pH and some mollusc species. There is also some information about calcium and potasium impact on malacocenosis. On the basis of results from this disertation thesis we can say, that optimal conditions for aquatic malacocenosis in waters in flooded mine subsidences are above the value 500 mg/l and the upper limitation value is about 1000 – 1200 mg/l total dissolved substances. In other examined hydrochemical parametres (pH, Ca, Mg, chlorids, sulfats) were not found statistically significant effects on the aquatic malacocenosis in flooded mine subsidences. In relation, there were identified 2 aquatic mollusc species as appropriate bioindicators of surface waters salinity, this study comment salso the water salinity condition in the course of hydric reclamation in flooded mine subsidences.