Strain-specific differences in the grazing sensitivities of closely related ultramicrobacteria affiliated with the Polynucleobacter cluster

Article Abstract:

Studies done to examine the sensitivity of ultramicrobacteria affiliated with the cosmopolitan Polynucleobacter cluster to grazing by Spumella-like nanoflagellates are reported. It is concluded that C-shaped ultramicrobacteria affiliated with the Polynucleobacter cluster proved to be vulnerable to grazing by Spumella-like flagllates even though grazing-related mortality is much lower than for larger bacteria. The importance of microdiversity in predator-prey interactions is highlighted and supports the idea of niche differentiation even between closely related and similar-sized-organisms with respect to their feeding ecology.

Microbiological research, Flagellates

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Isolation of novel ultramicrobacteria classified as actinobacteria from five freshwater habitats in Europe and Asia

Article Abstract:

Research shows that nine cultured ultramicrobacteria of the class Acinobacteria, together with several uncultured bacteria, form a diverse phylogenetic cluster of freshwater bacteria. Results reveal that lake isolates that are ecologically and geographically different exhibit identical 16s rRNA gene sequences but show different ecophysiological and phenotypic traits.

Austria, Germany, Analysis, Genetic aspects, Genotype, Genotypes, Bacteria, Identification and classification, Ribosomal RNA, Freshwater ecosystems

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Bacterioplankton community composition along a salinity gradient of sixteen high-mountain lakes located on the Tibetan plateau, China

Article Abstract:

An investigation of the influence of altitude and salinity on bacterioplankton composition is done in sixteen high-mountain lakes on Tibetan Plateau, China. The observation showed ecologically significant differences in ecophysiological adaptations among members of this narrow phylogenetic group and suggested ecological significance of microdiversity.

Environmental aspects, Bacterial growth, Planktonic bacteria, Tibetan Plateau

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