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    TY - JOUR AU - WILLE, Anton AU - SONNTAG, Bettina AU - SATTLER, Birgit AU - PSENNER, Roland TI - Abundance, biomass and size structure of the microbial assemblage in the high mountain lake Gossenköllesee (Tyrol, Austria) during the ice-free period PY - %1999/%08/%01 Y2 - %2026/%07/%27 JF - Journal of Limnology JA - J Limnol VL - 58 IS - 2 SE - Original Articles LA - en KW - Bacterioplankton KW - heterotrophic flagellates KW - ciliates KW - microbial biomass KW - alpine lake KW - high mountain lake KW - DO - 10.4081/jlimnol.1999.117 UR - https://doi.org/10.4081/jlimnol.1999.117 SP - 117-126 AB - The abundance, biomass and morphology of the microbial components (picocyanobacteria, heterotrophic bacteria, heterotrophic and autotrophic nanoflagellates, ciliates) of the pelagic food web of Gossenköllesee were investigated over two summer periods. The density of bacteria remained relatively stable not only over time but also in vertical profiles (2.5-5.5x105 cells ml-1). Bacterial biomass ranged between 35 to 63 mgC m-2 (5.4-15.3 μgC l-1). Small rod shaped bacteria with mean cell volumes of ~0.05 μm3 dominated numerically but filamentous forms (longer than 10 μm), mainly found in the upper water layers, amounting to more than 65% of the total bacterial biomass, increased the mean cell volume up to 0.27 μm3 (SD=0.88). Bacterial biomass represented between 48 and 86% of the total microbial biomass (40 - 90 mgC m-2), however at 8 m depth the biomass of heterotrophic flagellates (HNF) reached up to 26 mgC m-3 (2,852 cells ml-1). From 0-4 m depth small spherical HNF species with cell volumes 50 μm3 dominated throughout the sampling period. Ciliate abundance was low in the upper part of the water column. Only Askenasia chlorelligera and Urotricha cf pelagica occurred with numbers of up to 1,500 cells l-1. At 8 m depth, Balanion planctonicum was the dominant species throughout the study period reaching numbers of up to 16,000 cells l-1. Ciliate abundance was significantly correlated with chlorophyll-a concentrations (rs=0.55, p