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Bacterioplankton Community Composition along a Salinity Gradient of Sixteen High-Mountain Lakes Located on the Tibetan Plateau, China
- Qinglong L. Wu, G. Zwart, Michael Schauer, M. K. Kamst-van Agterveld, M. Hahn
- Environmental ScienceApplied and Environmental Microbiology
- 1 August 2006
Salinity was found to be the dominating environmental factor controlling BCC in the investigated lakes, resulting in only small overlaps in the BCCs of freshwater and hypersaline lakes, and ecologically significant differences in ecophysiological adaptations among members of this narrow phylogenetic group suggested ecological significance of microdiversity.
Isolation of Novel Ultramicrobacteria Classified as Actinobacteria from Five Freshwater Habitats in Europe and Asia
- M. Hahn, H. Lünsdorf, P. Stadler
- Biology, Environmental ScienceApplied and Environmental Microbiology
- 1 March 2003
The first freshwater members of the class Actinobacteria that have been isolated from five freshwater habitats in Europe and Asia are described and it is demonstrated that at least one of the ultramicrobacteria isolated is protected against predation by the bacterivorous nanoflagellate Ochromonas sp.
Grazing of protozoa and its effect on populations of aquatic bacteria.
The protistan grazing can result in bacterial responses at the community and the species level, and grazing-induced morphological shifts have been observed, which were directed towards either larger or smaller bacterial sizes or in both directions.
Isolation of Strains Belonging to the Cosmopolitan Polynucleobacter necessarius Cluster from Freshwater Habitats Located in Three Climatic Zones
- M. Hahn
- Environmental Science, BiologyApplied and Environmental Microbiology
- 1 September 2003
More than 40 bacterial strains belonging to the cosmopolitan Polynucleobacter necessarius cluster (Betaproteobacteria) were isolated from a broad spectrum of freshwater habitats located in three climatic zones, showing that the previous lack of isolates cannot be explained by a lack of appropriate media.
Broad diversity of viable bacteria in ‘sterile’ (0.2 μm) filtered water
- M. Hahn
- Environmental Science, Engineering
- 1 October 2004
The filtration-acclimatization method for isolation of an important fraction of the not readily cultivable bacteria.
Submersed macrophytes play a key role in structuring bacterioplankton community composition in the large, shallow, subtropical Taihu Lake, China.
- Qinglong L. Wu, G. Zwart, Jianfeng Wu, M. K. Kamst-van Agterveld, Shuangjiang Liu, M. Hahn
- Environmental ScienceEnvironmental microbiology
- 1 November 2007
Comparative statistical analyses of BCC revealed that the dominance of submersed macrophytes was the most influential factor on BCC, responsible for a major part of the observed within-habitat heterogeneity of BCC in Taihu Lake.
Broad diversity of viable bacteria in 'sterile' (0.2 microm) filtered water.
- M. Hahn
- Biology, EngineeringResearch in microbiology
Bacterial Filament Formation, a Defense Mechanism against Flagellate Grazing, Is Growth Rate Controlled in Bacteria of Different Phyla
The finding that the grazing defense mechanism consisting of filament formation is growth rate controlled in the flectobacilli investigated and C. acidovorans PX54 may indicate that this mechanism is a phylogenetically widely distributed defense strategy against grazing.
Maximum growth rates and possible life strategies of different bacterioplankton groups in relation to phosphorus availability in a freshwater reservoir.
Net growth rates of distinct bacterioplankton groups and heterotrophic nanoflagellate (HNF) communities in relation to phosphorus availability by analysing eight in situ manipulation experiments in the canyon-shaped Rímov reservoir are investigated.