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Appl. Environ. Microbiol., Sep 1997, 3359-3366, Vol 63, No. 9
J Pinhassi, UL Zweifel and A Hagstrom
The density of specific aquatic bacteria was determined by use of whole-
genome DNA hybridization towards community DNA. From a coastal marine
environment (northern Baltic Sea), 48 specific bacteria were isolated on
solid media over a 1-year period. Based on the presented hybridization
protocol, the total density of the isolates ranged between 7 and 69% of the
bacteria determined by acridine orange direct counts. When compared to the
number of nucleoid-containing cells, the range increased to 29 to 111%.
Thus, our results showed that bacteria able to form colonies on solid media
accounted for a large fraction of the bacterioplankton. There were
significant changes in the density of the different bacteria over the year,
suggesting that bacterioplankton exhibit a seasonal succession analogous to
phytoplankton. The bacteria studied were of diverse phylogenetic origin,
being distributed among the alpha, beta, and gamma subdivisions of the
class Proteobacteria and the cytophaga-flexibacter group. Partial 16S rRNA
gene sequence analysis of 29 Baltic Sea isolates as well as of 30 Southern
California Bight isolates showed that a majority of the isolates had low
similarity (0.85 to 0.95) to reported sequence data. This indicated that
the diversity of marine bacteria able to grow on solid media is largely
unexplored.
Copyright © 1997, American Society for Microbiology
Dominant marine bacterioplankton species found among colony-forming bacteria
Department of Microbiology, Umea University, Sweden.
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