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1 Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll PA37 1QA, UK
2 Australian Food Safety Centre, University of Tasmania, Hobart, Australia
3 Fisheries Research Services Marine Laboratory, Aberdeen AB11 9DB, UK
4 School of Aquaculture, University of Tasmania, Launceston, Australia
Correspondence
David H. Green
david.green{at}sams.ac.uk
Phylogenetic and phenotypic analysis of cultivable marine bacteria isolated from laboratory cultures of two paralytic shellfish toxin-producing dinoflagellates, Gymnodinium catenatum and Alexandrium tamarense, showed the presence of a novel group of Gram-negative, aerobic, moderately halophilic and hydrocarbon-degrading bacteria, related to the genus Marinobacter. The strains, designated DG893T, DG1136 and ATAM407-13, grew optimally in media with 3–6 % NaCl and at 25–30 °C, and all could utilize n-hexadecane and n-tetradecane as the sole carbon source. The strains had a 16S rRNA gene sequence similarity of 94·2–94·3 % to Marinobacter hydrocarbonoclasticus ATCC 27132, and a similarity of 97·5–97·8 % to the closest phylogenetically related type strain, Marinobacter flavimaris DSM 16070T. DNA–DNA hybridization levels to M. flavimaris and other Marinobacter type strains were 
42 %, while DNA–DNA reassociation values among DG893T, DG1136 and ATAM407-13 were 
83 %. The DNA G+C content was 54–55 mol% and the major isoprenoid quinone was ubiquinone-9. On the basis of phenotypic, chemotaxonomic, DNA–DNA hybridization and phylogenetic analysis, it is proposed that these three strains represent a novel species, Marinobacter algicola sp. nov. The type strain is DG893T (=DSM 16394T=NCIMB 14009T).
Published online ahead of print on 28 October 2005 as DOI 10.1099/ijs.0.63447-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains DG893T, DG1136 and ATAM407-13 are AY258110, AY258116 and AJ294359, respectively.
A transmission electron micrograph of cells of DG893T and a table detailing the cellular fatty acid composition of the three novel strains and the type strains of other Marinobacter species are available as supplementary material in IJSEM Online.
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