Size-selective grazing on bacteria by natural assemblages of estuarine flagellates and ciliates.

Applied and Environmental Microbiology
J M GonzálezB F Sherr

Abstract

The small average cell size of in situ bacterioplankton, relative to cultured cells, has been suggested to be at least partly a result of selection of larger-sized cells by bacterivorous protozoa. In this study, we determined the relative rates of uptake of fluorescence-labeled bacteria (FLB), of various cell sizes and cell types, by natural assemblages of flagellates and ciliates in estuarine water. Calculated clearance rates of bacterivorous flagellates had a highly significant, positive relationship with size of FLB, over a range of average biovolume of FLB of 0.03 to 0.08 microns3. Bacterial cell type or cell shape per se did not appear to affect flagellate clearance rates. The dominant size classes of flagellates which ingested all types of FLB were 3- to 4-microns cells. Ciliates also showed a general preference for larger-sized bacteria. However, ciliates ingested a gram-positive enteric bacterium and a marine bacterial isolate at higher rates than they did a similarly sized, gram-negative enteric bacterium or natural bacterioplankton, respectively. From the results of an experiment designed to test whether the addition of a preferentially grazed bacterial strain stimulated clearance rates of natural bacterioplankton FLB...Continue Reading

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Citations

Oct 24, 2002·Journal of Applied Microbiology·A A BordaloC Dechsakulwatana
Aug 9, 2005·Applied and Environmental Microbiology·Wei WangDavid S Kosson
Jun 15, 2005·Nature Reviews. Microbiology·Jakob Pernthaler
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