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MEPS 255:1-13 (2003)
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Abstract
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Spatial variability in bacterioplankton community composition at the Skagerrak-Kattegat Front
Jarone Pinhassi1,*, Anne Winding2, Svend J. Binnerup2, Ulla Li Zweifel4, Bo Riemann3, Åke Hagström4
1Institut de Ciències del Mar-CMIMA (CSIC), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Catalunya, Spain
2Department of Environmental Chemistry and Microbiology, and
3Department of Marine Ecology, National Environmental Research Institute, Frederiksborgvej 399, 4000 Roskilde, Denmark
4Marine Microbiology, Kalmar University, PO Box 905, 391 82 Kalmar, Sweden
*Email: jarone@cmima.csic.es
ABSTRACT: The distribution of bacterial heterotrophic production and cell concentrations in the world oceans is well documented. Nevertheless, information on the distribution of specific bacterial taxa and how this is influenced by environmental factors
in separate sea areas is sparse. Here we report on bacterial community structure across the Skagerrak-Kattegat front. The front separates North Sea water from water with a Baltic Sea origin. We documented community differences across the front using
denaturing gradient gel electrophoresis (DGGE) analysis of PCR-amplified bacterial 16S ribosomal DNA and whole-genome DNA hybridization towards community DNA. Analysis of the community 'fingerprints' by DGGE revealed clustering of samples according to
side of the front and depth. Consistent with these results, whole-genome DNA hybridization for 28 bacterial species isolated from the sampling region indicated that bacteria related to the Roseobacter clade and Bacteroidetes as well as
prosthecate bacteria (e.g. Hyphomonas) showed distinct distribution patterns on each side of the front, and also with depth. Differences in bacterioplankton species composition across the frontal area were paralleled by differences in quantitative
variables such as phytoplankton biomass (chl a), dissolved organic carbon, and bacterial production. Furthermore, we observed differences in more descriptive variables such as salinity range, bacterial growth-limiting nutrients and phytoplankton
composition. We suggest that not only quantitative but also qualitative differences in variables that affect bacterial growth are required to cause divergence in bacterioplankton community composition between marine regions.
KEY WORDS: Marine bacteria · Plankton · Species distribution · Environmental factors · Denaturing gradient gel electrophoresis · DGGE · DNA hybridization
Full text in pdf format
Published in MEPS Vol.
255
(2003) on June 24
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2003
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