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Applied and Environmental Microbiology, January 2002, p. 434-439, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.434-439.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The Microbial Community Structure of Drinking Water Biofilms Can Be Affected by Phosphorus Availability

Minna M. Keinänen,1,2* Leena K. Korhonen,1 Markku J. Lehtola,1 Ilkka T. Miettinen,1 Pertti J. Martikainen,2 Terttu Vartiainen,2,3 and Merja H. Suutari1

Laboratory of Environmental Microbiology,1 Laboratory of Chemistry,3 National Public Health Institute, FIN-70701 Kuopio, and Department of Environmental Sciences, Bioteknia 2, University of Kuopio, FIN-70211 Kuopio, Finland2

Received 30 May 2001/ Accepted 5 October 2001

Microbial communities in biofilms grown for 4 and 11 weeks under the flow of drinking water supplemented with 0, 1, 2, and 5 µg of phosphorus liter–1 and in drinking and warm waters were compared by using phospholipid fatty acids (PLFAs) and lipopolysaccharide 3-hydroxy fatty acids (LPS 3-OH-FAs). Phosphate increased the proportion of PLFAs 16:1{omega}7c and 18:1{omega}7c and affected LPS 3-OH-FAs after 11 weeks of growth, indicating an increase in gram-negative bacteria and changes in their community structure. Differences in community structures between biofilms and drinking and warm waters can be assumed from PLFAs and LPS 3-OH-FAs, concomitantly with adaptive changes in fatty acid chain length, cyclization, and unsaturation.

* Corresponding author: Mailing address: National Public Health Institute, Laboratory of Environmental Microbiology, P.O. Box 95, 70701 Kuopio, Finland. Phone: 358-17-201369. Fax: 358-17-201155. E-mail: Minna.Keinanen{at}ktl.fi.

Applied and Environmental Microbiology, January 2002, p. 434-439, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.434-439.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.





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