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Applied and Environmental Microbiology, September 2005, p. 5282-5289, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5282-5289.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Resistance of Marine Bacterioneuston to Solar Radiation

Hélène Agogué, Fabien Joux, Ingrid Obernosterer, and Philippe Lebaron*

Observatoire Océanologique, Université Pierre et Marie Curie, UMR 7621-INSU-CNRS, BP44, 66651 Banyuls-sur-Mer, France

Received 10 August 2004/ Accepted 19 April 2005

A total of 90 bacterial strains were isolated from the sea surface microlayer (i.e., bacterioneuston) and underlying waters (i.e., bacterioplankton) from two sites of the northwestern Mediterranean Sea. The strains were identified by sequence analysis, and growth recovery was investigated after exposure to simulated solar radiation. Bacterioneuston and bacterioplankton isolates were subjected to six different exposure times, ranging from 0.5 to 7 h of simulated noontime solar radiation. Following exposure, the growth of each isolate was monitored, and different classes of resistance were determined according to the growth pattern. Large interspecific differences among the 90 marine isolates were observed. Medium and highly resistant strains accounted for 41% and 22% of the isolates, respectively, and only 16% were sensitive strains. Resistance to solar radiation was equally distributed within the bacterioneuston and bacterioplankton. Relative contributions to the highly resistant class were 43% for {gamma}-proteobacteria and 14% and 8% for {alpha}-proteobacteria and the Cytophaga/Flavobacterium/Bacteroides (CFB) group, respectively. Within the {gamma}-proteobacteria, the Pseudoalteromonas and Alteromonas genera appeared to be highly resistant to solar radiation. The majority of the CFB group (76%) had medium resistance. Our study further provides evidence that pigmented bacteria are not more resistant to solar radiation than nonpigmented bacteria.

* Corresponding author. Mailing address: Observatoire Océanologique, Université Pierre et Marie Curie, UMR 7621-INSU-CNRS, BP44, 66651 Banyuls-sur-Mer, France. Phone: 33 4 68 88 73 53. Fax: 33 4 68 88 73 98. E-mail: lebaron{at}obs-banyuls.fr.

Applied and Environmental Microbiology, September 2005, p. 5282-5289, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5282-5289.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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