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Applied and Environmental Microbiology, August 2006, p. 5254-5259, Vol. 72, No. 8
0099-2240/06/$08.00+0     doi:10.1128/AEM.00554-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Bacteria Associated with Mucus and Tissues of the Coral Oculina patagonica in Summer and Winter

Omry Koren and Eugene Rosenberg*

Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv, Israel 69978

Received 8 March 2006/ Accepted 31 May 2006

The relative abundance of bacteria in the mucus and crushed tissue of the Mediterranean coral Oculina patagonica was determined by analyses of the 16S rRNA genes of isolated colonies and from a 16S rRNA clone library of extracted DNA. By SYBR gold staining, the numbers of bacteria in mucus and tissue samples were 6.2 x 107 and 8.3 x 108/cm2 of coral surface, respectively, 99.8% of which failed to produce colonies on Marine Agar. From analysis of mucus DNA, the most-abundant bacterium was Vibrio splendidus, representing 68% and 50% of the clones from the winter and summer, respectively. After removal of mucus from coral by centrifugation, analyses of DNA from the crushed tissue revealed a large diversity of bacteria, with Vibrio species representing less than 5% of the clones. The most-abundant culturable bacteria were a Pseudomonas sp. (8 to 14%) and two different {alpha}-proteobacteria (6 to 18%). Out of a total 1,088 16S rRNA genes sequenced, 400 different operational taxonomic units were identified (>99.5% identity). Of these, 295 were novel (<99% identical to any sequences in the GenBank database). This study provides a comprehensive database for future examinations of changes in the bacterial community during bleaching events.

* Corresponding author. Mailing address: Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv, Israel 69978. Phone: 972-3-6409838. Fax: 972-3-6429377. E-mail: eros{at}post.tau.ac.il.

Applied and Environmental Microbiology, August 2006, p. 5254-5259, Vol. 72, No. 8
0099-2240/06/$08.00+0     doi:10.1128/AEM.00554-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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