Effect of UV Radiation on the Bacterivory of a Heterotrophic Nanoflagellate.

Applied and Environmental Microbiology
R SommarugaR Psenner

Abstract

The effects of UV-B radiation on the heterotrophic nanoflagellate Bodo saltans (Kinetoplastida) were examined under controlled conditions with artificial UV sources and also under natural solar radiation in an oligotrophic lake. In both types of experiments, the characteristic elongated cell morphology of this flagellate changed into a spherical one. This effect was due to UV-B but also to UV-A radiation, and after 4 h of exposure at 0.5 m of depth, 99% (UV-B plus UV-A plus photosynthetically active radiation) and 69% of the cells (UV-A plus photosynthetically active radiation) were spherical. At 6 m of depth where only 10% of the UV-B (305 nm) at the surface was measured, no significant effect was observed. The spherical cells were nonmotile, but before the morphological change took place, the swimming speed was ca. 3.5 times lower in the plus-UV-B treatment. The negative relation between the abundance of spherical cells and the average ingestion of fluorescently labeled bacteria per cell indicates that these cells are not able to feed upon bacteria. In bacterivory experiments lasting for 6 h, the total number of grazed bacteria was up to 70% lower in the plus-UV-B treatment than in the control without UV-B. This resulted in a...Continue Reading

References

Jan 11, 1994·Biochemistry·A Sancar
May 1, 1993·Applied and Environmental Microbiology·E L LimE F DeLong
Sep 1, 1995·Applied and Environmental Microbiology·R Sommaruga, R Psenner

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Citations

Oct 31, 1998·Applied and Environmental Microbiology·J PernthalerR Amann
Aug 10, 2007·Environmental Microbiology·María Teresa Pérez, Ruben Sommaruga
Aug 2, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Paul H Hörtnagl, Ruben Sommaruga
Aug 27, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Lars-Anders Hansson, Samuel Hylander
Sep 10, 2005·Applied and Environmental Microbiology·Falk WarneckeJakob Pernthaler
Jan 6, 2007·Photochemistry and Photobiology·Fernando MomoSerge Demers
Jun 10, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Marcela Bastidas NavarroBeatriz Modenutti
Jul 12, 2017·Inland Waters : Journal of the International Society of Limnology·Bettina SonntagMonika Summerer
Mar 29, 2016·Journal of Evolutionary Biology·S OexleR Stoks
Sep 23, 2000·The Journal of Eukaryotic Microbiology·R Sommaruga, A G Buma
Mar 13, 2014·Journal of Plankton Research·Barbara TartarottiRuben Sommaruga
Apr 20, 2019·Journal of Phycology·Juan Manuel González-OlallaPresentación Carrillo
Aug 24, 2017·The Journal of Eukaryotic Microbiology·Barbara KammerlanderBettina Sonntag
May 3, 2001·Journal of Photochemistry and Photobiology. B, Biology·R Hofer, C Mokri

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