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Applied and Environmental Microbiology, February 2001, p. 665-672, Vol. 67, No. 2
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.2.665-672.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Impact of UV Radiation on Bacterioplankton Community Composition†

Christian Winter, Markus M. Moeseneder, and Gerhard J. Herndl*

Department of Biological Oceanography, Netherlands Institute for Sea Research, 1790 AB Den Burg, Texel, The Netherlands

Received 13 July 2000/Accepted 3 November 2000

The potential effect of UV radiation on the composition of coastal marine bacterioplankton communities was investigated. Dilution cultures with seawater collected from the surface mixed layer of the coastal North Sea were exposed to different ranges of natural or artificial solar radiation for up to two diurnal cycles. The composition of the bacterioplankton community prior to exposure was compared to that after exposure to the different radiation regimes using denaturing gradient gel electrophoresis (DGGE) of 16S rRNA and 16S ribosomal DNA. Only minor changes in the composition of the bacterial community in the different radiation regimes were detectable. Sequencing of selected bands obtained by DGGE revealed that some species of the Flexibacter-Cytophaga-Bacteroides (FCB) group were sensitive to UV radiation while other species of the FCB group were resistant. Overall, only up to approx 10% of the operational taxonomic units present in the dilution cultures appeared to be affected by UV radiation. Thus, we conclude that UV radiation has little effect on the composition of coastal marine bacterioplankton communities in the North Sea.

* Corresponding author. Mailing address: Dept. of Biological Oceanography, Netherlands Institute for Sea Research (NIOZ), P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands. Phone: 31 222-369-507. Fax: 31 222-319-674. E-mail: herndl{at}nioz.nl.

dagger Publication no. 3548 of the Netherlands Institute for Sea Research.

Applied and Environmental Microbiology, February 2001, p. 665-672, Vol. 67, No. 2
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.2.665-672.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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