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

Applied and Environmental Microbiology
Jakob PernthalerR Amann

Abstract

We investigated whether individual populations of freshwater bacteria in mixed experimental communities may exhibit specific responses to the presence of different bacterivorous protists. In two successive experiments, a two-stage continuous cultivation system was inoculated with nonaxenic batch cultures of the cryptophyte Cryptomonas sp. Algal exudates provided the sole source of organic carbon for growth of the accompanying microflora. The dynamics of several 16S rRNA-defined bacterial populations were followed in the experimental communities. Although the composition and stability of the two microbial communities differed, numerous members of the first assemblage could again be detected during the second experiment. The introduction of a size-selectively feeding mixotrophic nanoflagellate (Ochromonas sp.) always resulted in an immediate bloom of a single phylotype population of members of the class Actinobacteria (Ac1). These bacteria were phylogenetically affiliated with an uncultured lineage of gram-positive bacteria that have been found in freshwater habitats only. The Ac1 cells were close to the average size of freshwater bacterioplankton and significantly smaller than any of the other experimental community members. In ...Continue Reading

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Citations

Jun 15, 2005·Nature Reviews. Microbiology·Jakob Pernthaler
Aug 4, 2006·Applied and Environmental Microbiology·Jun MurasePeter Frenzel
Jun 9, 2009·Applied and Environmental Microbiology·Mitsunori TaraoMartin W Hahn
Sep 11, 2007·Applied and Environmental Microbiology·Ryan J NewtonKatherine D McMahon
Nov 27, 2002·Applied and Environmental Microbiology·Regin RønnJames I Prosser
Nov 7, 2003·Applied and Environmental Microbiology·Ulrike BurkertJakob Pernthaler
Mar 7, 2003·Applied and Environmental Microbiology·Martin W HahnPeter Stadler
Apr 5, 2003·Applied and Environmental Microbiology·Alke BrunsJörg Overmann
May 7, 2003·Applied and Environmental Microbiology·Christine BeardsleyRudolf Amann
May 7, 2003·Applied and Environmental Microbiology·Raju SekarRudolf Amann
Feb 5, 2005·Applied and Environmental Microbiology·Carsten Matz, Klaus Jürgens
Sep 10, 2005·Applied and Environmental Microbiology·Falk WarneckeJakob Pernthaler
May 5, 2006·Applied and Environmental Microbiology·Martin Allgaier, Hans-Peter Grossart
Mar 5, 2011·Microbiology and Molecular Biology Reviews : MMBR·Ryan J NewtonStefan Bertilsson
Sep 9, 2005·Microbiology and Molecular Biology Reviews : MMBR·Jakob Pernthaler, Rudolf Amann
Jun 22, 2011·Applied Microbiology and Biotechnology·Dana VejmelkovaMark C M van Loosdrecht
Sep 8, 2006·Applied Microbiology and Biotechnology·Rajkumari KumaraswamyGerard Muyzer
Jun 30, 2009·Environmental Microbiology·Stuart E JonesKatherine D McMahon
Feb 12, 2004·Environmental Microbiology·Falk WarneckeJakob Pernthaler
May 13, 2006·Environmental Microbiology·Ryan J NewtonKatherine D McMahon
Dec 2, 2008·Journal of Applied Microbiology·F S Silbaq
Oct 10, 2007·Environmental Microbiology·Martin AllgaierHans-Peter Grossart
Feb 19, 2013·Environmental Microbiology·Ester M EckertJakob Pernthaler
Sep 3, 2011·Environmental Microbiology·Hyatt C GreenKatharine G Field
Jun 7, 2014·Environmental Microbiology·Stefan M NeuenschwanderMichaela M Salcher
Jul 31, 2013·Environmental Microbiology·Joshua A LivermoreStuart E Jones
May 13, 2006·FEMS Microbiology Ecology·Milagros ZaballosFrancisco Rodríguez-Valera
Jan 3, 2013·FEMS Microbiology Ecology·Clara Ruiz-GonzálezSergi Sabater

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