Abstract
The wetland habitats created within the area of sugar factory sedimentation basins on the periphery of the Opava city (Czech Republic: Silesia) proved to be a secondary refuge of water-associated soldierflies (Diptera: Stratiomyidae), all of which had already disappeared from the surrounding agricultural landscape. A total of 12 species (9 with aquicolous larvae) have been recorded. Five species belong to endangered taxa in the Czech Republic, three being classified as vulnerable and two, Odontomyia angulata (Panzer 1798) and Odontomyia annulata (Meigen 1822) even as regionally extinct species. It is suggested that the impact of the sugar industry (sedimentation of waste water and sludge) positively influenced the water regime (by adding water) and chemistry (by increasing pH and Ca+ concentration in the water) of the area. These circumstances combined with the presence of abandoned basins and adjacent sedge marsh and flowering meadow constituted ideal conditions for breeding of jeopardized soldierflies with aquatic larvae.
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