Predator-specific enrichment of actinobacteria from a cosmopolitan freshwater clade in mixed continuous culture

0150355 - HBU-Z 20013070 RIV US eng J - Journal Article
Pernthaler, J. - Posch, T. - Šimek, Karel - Vrba, Jaroslav - Pernthaler, A. - Glöckner, F. O. - Nübel, U. - Psenner, R. - Amann, R.
Predator-specific enrichment of actinobacteria from a cosmopolitan freshwater clade in mixed continuous culture.
Applied and Environmental Microbiology. Roč. 67, č. 5 (2001), s. 2145-2155. ISSN 0099-2240. E-ISSN 1098-5336
R&D Projects: GA ČR GA206/99/0028
Grant - others:ANB(AT) OENB6513; AKTION(AT) 23P5
Keywords : protistan bacterivory * Cyclidium glaucoma * Ochromonas sp.
Subject RIV: EE - Microbiology, Virology
Impact factor: 3.688, year: 2001

Individual populations of freshwater bacteria in mixed experimental communities exhibited specific responses to the presence of different bacterivorous protists. The dynamics of several 16S rRNA-defined bacterial populations were followed in the experimental communities. The introduction of a mixotrophic nanoflagellate always resulted in an immediate bloom of a single phylotype population (Ac1). These bacteria were phylogenetically affiliated with an uncultured lineage of gram-positive bacteria that have been found in freshwater habitats only. In contrast, no increase of this population was observed in vessels exposed to a bacterivorous ciliate. However, when the mixotroph was added to the established ciliate culture, the proportion of population Ac1 within the microbial community rapidly increased. Populations of a beta proteobacterial phylotype decreased relative to the total bacterial communities following the addition of either predator, albeit to different extents.
Permanent Link: http://hdl.handle.net/11104/0047893