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Flavobacterium aquidurense sp. nov. and Flavobacterium hercynium sp. nov., from a hard-water creek

DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Correspondence
Sylvie Cousin
sylvie.cousin{at}dsmz.de

Ten new Flavobacterium-like strains were isolated from freshwater of the hard-water creek Westerhöfer Bach, northern Germany. These strains formed two phylogenetic groups: strains WB 1.1-56^T, WB 1.1-04, WB 1.1-14, WB 1.1-57 and WB 1.1-63; and strains WB 4.2-33^T, WB 4.1-86, WB 4.2-34, WB 4.2-32 and WB 4.2-78. Cells were Gram-negative, yellow-pigmented, chemoheterotrophic rods. Their major fatty acid profiles were similar, consisting of iso-C_{15 : 0}, iso-C_{15 : 0} 3-OH, iso-C_{17 : 0} 3-OH and summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH). DNA G+C contents for strains WB 1.1-56^T and WB 4.2-33^T were 33.5 and 37.5 mol%, respectively. Phylogenetic analysis based on almost complete 16S rRNA gene sequences indicated that strain WB 1.1-56^T was phylogenetically most closely related to Flavobacterium frigidimaris KUC-1^T, and that strain WB 4.2-33^T was related most closely to F. frigidimaris KUC-1^T and Flavobacterium saccharophilum DSM 1811^T. Levels of 16S rRNA gene sequence similarity between strains WB 1.1-56^T and WB 4.2-33^T and the type strains of recognized members of the genus Flavobacterium were below 98 %. DNA–DNA hybridization experiments confirmed the separate genomic status of strains WB 1.1-56^T and WB 4.2-33^T. Strains WB 1.1-56^T and WB 4.2-33^T and their respective relatives differed from phylogenetically related Flavobacterium species based on several phenotypic characteristics. On the basis of their phenotypic and phylogenetic distinctiveness, the two groups of strains are considered to represent two novel species, for which the names Flavobacterium aquidurense sp. nov. (type strain WB 1.1-56^T=DSM 18293^T=CIP 109242^T) and Flavobacterium hercynium sp. nov. (type strain WB 4.2-33^T=DSM 18292^T=CIP 109241^T) are proposed.

A table giving the fatty acid compositions of the novel strains and related members of the genus Flavobacterium and a dendrogram based on these results are available as supplementary material in IJSEM Online.

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