Permanent presence of grazing-resistant bacteria in a hypertrophic lake.

Applied and Environmental Microbiology
R Sommaruga, R Psenner

Abstract

The size structure of planktonic bacteria from a hypertrophic lake was investigated at 5- to 15-day intervals by means of a semiautomatic image analysis system during 1 year. Characteristic of this bacterial assemblage was the permanent presence of large filamentous bacteria and small cocci with cell sizes of <0.01 (mu)m(sup3). These filamentous bacteria, sometimes longer than 200 (mu)m and with cell volumes of up to 276 (mu)m(sup3), are larger than nanoflagellates (<20 (mu)m) and, even, metazoans living in the lake. Although they account for only 4 to 16% of bacterial abundance, their contribution to total bacterial biovolume was between 45 and 86%. An analysis of the food web structure indicates that this particular bacterial size structure may be the consequence of a strong bacterivory pressure by nanoflagellates and the absence of other larger bacterivores. The persistence of bacterial forms resistant to grazing has important consequences for the carbon flow within the microbial food web.

References

Nov 1, 1992·Applied and Environmental Microbiology·K Simek, T H Chrzanowski

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Citations

Oct 31, 1998·Applied and Environmental Microbiology·J PernthalerR Amann
Oct 7, 2004·Applied and Environmental Microbiology·Jakob PernthalerKlaus Jürgens
Sep 9, 2005·Microbiology and Molecular Biology Reviews : MMBR·Jakob Pernthaler, Rudolf Amann
Nov 30, 2010·Ecological Entomology·K S Pelz-StelinskiM G Kaufman
Sep 23, 2000·The Journal of Eukaryotic Microbiology·R Sommaruga, A G Buma
Jan 9, 2004·Applied and Environmental Microbiology·Qinglong L WuMartin W Hahn
Jun 10, 2010·Photochemistry and Photobiology·Beatriz ModenuttiEmanuele Caravati
Apr 11, 2001·FEMS Microbiology Ecology·M W. Hahn, M G. Höfle
Oct 1, 2002·FEMS Microbiology Ecology·Hanne DegansKlaus Jürgens
May 24, 2018·Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire·Charlene E LancasterMauricio R Terebiznik
Dec 1, 1996·Applied and Environmental Microbiology·R SommarugaR Psenner

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