Abstract
The abundance of bacteria inhabiting the sediment-water interface and their taxonomic composition were determined with the fluorescence in situ hybridization (FISH) method in a marine harbor channel in Ustka. Among bacteria inhabiting the studied layer Gammaproteobacteria (1.4 cells 108·dm−3) and Cytophaga-Flavobacterium (1.1 cells 108·dm−3) dominated. Vibrio and Pseudomonas represented only a small fraction of the total cell counts. All taxonomic groups of studied bacteria show significant positive correlation between their abundance. The total bacterial number varied from 3.3 to 23.5 cells 108·dm−3 and their biomass oscillated from 39.4 to 282.4 μg C·dm−3. This parameter differed along horizontal profiles, while there were no significant differences in the abundance of the studied taxonomic groups among the study sites of the channel in Ustka. The total number of bacteria as well as the abundance of bacterial phylogenetic groups were subject to seasonal fluctuation in the studied water basin.
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