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Applied and Environmental Microbiology, February 1999, p. 514-522, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Diversity of Free-Living and Attached Bacteria in Offshore Western Mediterranean Waters as Depicted by Analysis of Genes Encoding 16S rRNA

Silvia G. Acinas,1 Josefa Antón,2 and Francisco Rodríguez-Valera1,*

Unidad de Microbiología, Centro de Biología Molecular y Celular, Universidad Miguel Hernández, Campus de San Juan, 03550 San Juan, Alicante,1 and División de Microbiología, Departamento de Biotecnología, Universidad de Alicante, 03080 Alicante,2 Spain

Received 30 April 1998/Accepted 12 November 1998

In a previous study (S. G. Acinas, F. Rodríguez-Valera, and C. Pedrós-Alió, FEMS Microbiol. Ecol. 24:27-40, 1997), community fingerprinting by 16S rDNA restriction analysis applied to Mediterranean offshore waters showed that the free-living pelagic bacterial community was very different from the bacterial cells aggregated or attached to particles of more than about 8 µm. Here we have studied both assemblages at three depths (5, 50, and 400 m) by cloning and sequencing the 16S rDNA obtained from the same samples, and we have also studied the samples by scanning electron microscopy to detect morphology patterns. As expected, the sequences retrieved from the assemblages were very different. The subsample of attached bacteria contained very little diversity, with close relatives of a well-known species of marine bacteria, Alteromonas macleodii, representing the vast majority of the clones at every depth. On the other hand, the free-living assemblage was highly diverse and varied with depth. At 400 m, close relatives of cultivated gamma  Proteobacteria predominated, but as shown by other authors, near the surface most clones were related to phylotypes described only by sequence, in which the alpha  Proteobacteria of the SAR11 cluster predominated. The new technique of rDNA internal spacer analysis has been utilized, confirming these results. Clones representative of the A. macleodii cluster have been completely sequenced, producing a picture that fits well with the idea that they could represent a genus with at least two species and with a characteristic depth distribution.

* Corresponding author. Mailing address: Unidad de Microbiología, Centro de Biología Molecular y Celular, Universidad Miguel Hernández, Campus de San Juan, Apartado 18, 03550 San Juan, Alicante, Spain. Phone: 34 6 5919451. Fax: 34 6 5919457. E-mail: FRVALERA{at}UMH.ES.

Applied and Environmental Microbiology, February 1999, p. 514-522, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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