Abstract
ABSTRACT In stream corridors, driftwood represents mainly a dead vegetation biomass and diverse artificial material relocated along a stream by flooding. Most driftwood can contain empty molluscan shells or a minor proportion of live individuals (i.e. molluscan allocoenoses). Drifted material is important for spreading of fauna and flora. Molluscan allocoenoses can provide valuable information on molluscan fauna of the upstream area. The main objective of the study was to describe changes of the species composition, diversity and similarity in molluscan allocoenoses along the model river ecosystem in relation to land use of partial watersheds. In the years 2010–2011, 23 samples of driftwood were taken at 23 sites along the Hron River (Central Slovakia) from the spring to the mouth. Molluscan allocoenoses were composed of 135 species (95 terrestrial and 40 aquatic). The number of species found at particular sites ranged from 29 to 72 with a mean of 48. We confirmed our hypotheses that similarity in mollusc...
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