Changes in bacterial community composition and dynamics and viral mortality rates associated with enhanced flagellate grazing in a mesoeutrophic reservoir

Article Abstract:

During predation by protists, bacterioplankton form grazing-resistant flocs and filaments that eventually make up most of the biomass. Protist grazing also seems to activate viral activity, which also contributes to bacterioplankton mortality.

Patient outcomes, Mortality, Predation

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Influence of top-down and bottom-up manipulations on the R-BT065 subcluster of beta-proteobacteria, an abundant group in bacterioplankton of a freshwater reservoir

Article Abstract:

The effects of nutrient availability and protistan grazing on bacterial dynamics and community composition (BCC) in different parts of the canyon-shaped Rimov reservoir are studied. The effects of protistan grazing on BCC are examined using a size fractionation approach.

United States, Water Supply and Irrigation Systems, Science & research, Water supply, Fresh Water, Planktonic bacteria, Freshwater zooplankton

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Morphological and compositional changes in a planktonic bacterial community in response to enhanced protozoan grazing

Article Abstract:

Changes in the morphology and composition of a natural planktonic bacterial community due to enhanced protozoan grazing have been studied. Image analysis and fluorescent in situ hybridization together with group-specific rRNA-targeted oligonucleotide probes are used in the study. Results indicate that there was a succession from fast-growing small bacteria to the larger grazing-resistant types when the metazooplankton was removed, which, in turn, triggered higher protozoan grazing.

Microbial populations, Protozoa, Protozoans

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