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Abstract
This paper completes knowledge on aquatic molluscs of the free flowing part of the Elbe River between Hřensko and the weir with lock in Ústí nad Labem – Střekov. Altogether, 21 species of aquatic molluscs (9 gastropods, 12 bivalves) were found in 2009. Viviparus viviparus, Potamopyrgus antipodarum, Bithynia tentaculata, Ancylus fluviatilis, Unio pictorum, Anodonta anatina, Corbicula fluminea, Sphaerium corneum and Pisidium supinum were the most frequently occurring molluscs found during this research. The occurrence of two endangered bivalves Pseudanodonta complanata and Pisidium moitessierianum was recorded. No significant difference from the previous author’s research was found. Molluscan communities of this part of the river were compared with those of the upper canalized part of the Elbe River which contain more species (especially gastropods) living predominantly in stagnant or slowly flowing waters e. g. Stagnicola palustris, S. corvus, Lymnaea stagnalis, Planorbis planorbis, Bathyomphalus contortus, Anisus vortex, Hippeutis complanatus, Ferrissia fragilis.
Highlights
Hřensko and Střekov and a comparison with molluscan communities in other parts of the Elbe River
Potamopyrgus antipodarum, Bithynia tentaculata, Ancylus fluviatilis, Unio pictorum, Anodonta anatina, Corbicula fluminea, Sphaerium corneum and Pisidium supinum were the most frequently occurring molluscs found during this research
PETRUSEK A., BERAN L., 2006: Distribution of non-indigenous aquatic crustaceans and molluscs in the Czech Republic: invasion routes to the “upstream country”. – Abstract book, pp
Summary
BERAN L., 2009: Doplněk k poznání vodních měkkýšů Labe mezi Hřenskem a Střekovem a srovnání s malakofaunou Labe v jiných úsecích [A supplement to the knowledge on aquatic molluscs of the Elbe River between. Hřensko and Střekov and a comparison with molluscan communities in other parts of the Elbe River This paper completes knowledge on aquatic molluscs of the free flowing part of the Elbe River between Hřensko and the weir with lock in Ústí nad Labem – Střekov. No significant difference from the previous author’s research was found Molluscan communities of this part of the river were compared with those of the upper canalized part of the Elbe River which contain more species (especially gastropods) living predominantly in stagnant or slowly flowing waters e. Přestože se autor malakofaunou tohoto úseku Labe již před několika lety zabýval (BERAN 2003, 2005), bylo vzhledem k většímu množství nových údajů získaných v roce 2009 (bohužel právě z důvodu plánů na výstavbu dalšího stupně v Děčíně) vhodné tyto nové výsledky prezentovat právě nyní a porovnat složení malakofauny v tomto úseku s předchozími průzkumy a zároveň se nabízelo využít dat z předchozích průzkumů Labe pro srovnání s kanalizovanými úseky výše proti proudu
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