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Applied and Environmental Microbiology, July 2000, p. 3052-3057, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Extremely Halophilic Bacteria in Crystallizer Ponds from Solar Salterns

Josefa Antón,1,* Ramón Rosselló-Mora,2,dagger Francisco Rodríguez-Valera,3 and Rudolf Amann2

División de Microbiología, Departamento de Fisiología, Genética y Microbiología, Universidad de Alicante, 03080 Alicante,1 and División de Microbiología, Universidad Miguel Hernández, 03550 Alicante,3 Spain, and Max Planck Institute for Marine Microbiology, Bremen, D-28359, Germany2

Received 7 February 2000/Accepted 13 April 2000

It is generally assumed that hypersaline environments with sodium chloride concentrations close to saturation are dominated by halophilic members of the domain Archaea, while Bacteria are not considered to be relevant in this kind of environment. Here, we report the high abundance and growth of a new group of hitherto-uncultured Bacteria in crystallizer ponds (salinity, from 30 to 37%) from multipond solar salterns. In the present study, these Bacteria constituted from 5 to 25% of the total prokaryotic community and were affiliated with the Cytophaga-Flavobacterium-Bacteroides phylum. Growth was demonstrated in saturated NaCl. A provisional classification of this new bacterial group as "Candidatus Salinibacter gen. nov." is proposed. The perception that Archaea are the only ecologically relevant prokaryotes in hypersaline aquatic environments should be revised.

* Corresponding author. Mailing address: División de Microbiología, Departamento de Fisiología, Genética y Microbiología, Universidad de Alicante, Apto. 99, San Vicente del Raspeig, 03080 Alicante, Spain. Phone: 34-965903870. Fax: 34-965909569. E-mail: anton{at}ua.es.

dagger Present address: Laboratori de Microbiologia, Facultat de Ciències, Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain.

Applied and Environmental Microbiology, July 2000, p. 3052-3057, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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