Zvyšky bratislavských lužných lesov – významné refúgium podunajskej malakofauny [Remnants of alluvial woodland in a urbanised area – important refuge for Middle-Danubian land gastropods (Bratislava City, Slovakia)]

Abstract

The paper brings a review of a long-term malacological survey of fragmented urban alluvial woodland, an important refuge of Middle-Danubian terrestrial molluscan fauna. In the area of Bratislava agglomeration we surveyed two softwood and 26 hardwood alluvial forests. Altogether, 52 mollusc species have been recorded during the last 20 years (representing 79% of the total terrestrial mollusc fauna living in the Slovak section of the Danube floodplain). The most frequent species (more than 75% sites) were Aegopinella nitens, Helix pomatia, Monachoides incarnatus (every three species at 27 sites, i.e. 96%), Cochlodina laminata (26 sites, 93%), Petasina unidentata (25 sites), Urticicola umbrosus (24 sites), Alinda biplicata (23 sites), and Clausilia pumila (21 sites). The main ecological groups were forest species in general (45%, mainly eurytopic and slightly hygrophilous), hygrophilous species in general (26%, hygrophilous and riparian), euryecious species (16%), semi-steppe (8%) and open-country species (5%).