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The data on the distribution of Anisus vorticulus (Troschel) in the Czech Republic are summarised and analysed, including information on habitats, co-occurrence and monitoring data from selected sites. The species occurs mainly in the floodplains of the biggest Czech rivers. It has always been rare; in the Czech Republic it mostly inhabits small pools and oxbows. Stream regulation, eutrophication and destruction of sites have gradually caused a considerable decline in its population. Selected sites have been monitored since 1999. The highest recorded abundance is 632 specimens per monitoring plot (0.5×0.5 m) and generally fluctuates from 2 to 150 individuals per plot. The highest densities are usually recorded in pools overgrown with Lemna trisulca. A gradual decline or probable extinction have been documented; they mainly result from changes caused by natural succession. Intentional transfers (repatriations, introductions) of A. vorticulus have been tested and the results show that they may constitute a conservation measure.

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Changes in the distribution of Anisus vorticulus (Troschel, 1834) (Gastropoda: Planorbidae) in the Czech Republic, monitoring and notes on habitat requirements