Affiliation:
1. Institut für Chemie und Biologie des Meeres, Oldenburg,1 and
2. Institut für Gewässerökologie und Binnenfischerei, Neuglobsow,2 Germany
Abstract
ABSTRACT
During the last 100 years, the neuston bacterium
Nevskia ramosa
has been described several times. This bacterium forms conspicuous rosette-like microcolonies at the air-water interface. In this study, pure cultures of
Nevskia ramosa
were obtained for the first time, from a bog lake (strain Soe1, DSMZ 11499
T
) and a freshwater ditch (strain OL1, DSMZ 11500). The isolates showed special adaptations to life in the epineuston. They formed hydrophobic surface films with a dull appearance.
N. ramosa
is sensitive to UV radiation but revealed a very effective photorepair mechanism. Exposure to light at a wavelength of 350 nm after UV treatment raised the number of surviving cells by several orders of magnitude. The isolates grew with a broad range of organic substrates. Surface films were formed only in the absence of combined nitrogen; however, nitrogenase activity was not detected. It appears that during growth at the air-water interface the cells benefit from trapping ammonia from the air. The G+C content of the DNA was 67.8 and 69.0 mol% for strains Soe1 and OL1, respectively. The slight difference was confirmed by enterobacterial repetitive intergenic consensus PCR. The 16S rRNA sequences revealed 99.2% similarity. Thus, both isolates belong to the same species. The phylogenetic analysis indicated that
Nevskia
is a member of the gamma-subclass
Proteobacteria
that has no known close relatives.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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