Abstract
Although hypersaline environments have been extensively examined, only a limited number of microbial community studies have been performed in saline tide pools. We have studied a temporary salt-saturated tide pool and isolated prokaryotes from the water. Chlorinity measurements revealed that the tide pool brine could be characterized as one of the most hypersaline ecosystems on earth. Enumeration of microorganisms at different salinities showed that the tide pool was dominated by moderate halophiles. Based on 16S rRNA gene sequence analysis, the prokaryotic strains isolated were related to the bacterial genera Rhodovibrio, Halovibrio, Aquisalimonas, Bacillus and Staphylococcus and to the haloarchaeal species Haloferax alexandrinus. Four bacterial isolates were distantly related to their closest validly described species Aquisalimonas asiatica (96.5 % similarity), representing a novel phylogenetic linkage. Ecophysiological analysis also revealed distinct phenotypic profiles for the prokaryotic strains analyzed. The herbicide 2,4-dichlorophenoxyacetate could be effectively utilized by selected strains as the sole carbon source, but phenolic compounds could not be utilized by any of the halophilic isolates examined. None of the halophilic strains were able to grow without the presence of sea salt or seawater. Based on these results, we conclude that moderate halophilic bacteria rather than extremely halophilic archaea dominate in such a hypersaline environment.


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Ntougias, S. Phylogeny and ecophysiological features of prokaryotes isolated from temporary saline tidal pools. Ann Microbiol 64, 599–609 (2014). https://doi.org/10.1007/s13213-013-0693-y
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DOI: https://doi.org/10.1007/s13213-013-0693-y

