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Applied and Environmental Microbiology, August 2004, p. 4848-4854, Vol. 70, No. 8
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.8.4848-4854.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Influence of Humic Substances on Bacterial and Viral Dynamics in Freshwaters

Alexandre M. Anesio,1* Christin Hollas,2 Wilhelm Granéli,2 and Johanna Laybourn-Parry1

School of Biosciences, The University of Nottingham, Nottingham NG7 2RD, United Kingdom,1 Department of Limnology, Lund University, Lund S-223 62, Sweden2

Received 22 December 2003/ Accepted 19 April 2004

Bacterial and viral abundances were measured in 24 lakes with dissolved organic carbon (DOC) concentrations ranging from 3 to 19 mg of C liter–1. In addition, a laboratory experiment was performed to test the effects of different sources of carbon (i.e., glucose and fulvic acids) and nutrients on the dynamics of viruses and bacteria. In the lake survey, no correlation was found between virus abundance and DOC concentration, yet there was a significant positive correlation between bacterial abundance and DOC concentration. A negative correlation was found between the virus-to-bacteria ratio and DOC level. These results are in agreement with our findings in the laboratory, where virus counts were significantly lower in treatments with fulvic acid additions than in a control (mean, 67.4% ± 6.5% of the control). Virus counts did not differ significantly among the control and treatments with glucose, indicating that it was the type of organic carbon and not quantity which had an impact on viruses. Results from this study suggest that the way viruses control bacterial assemblages in humic lakes is different from the mechanism in clear water systems.

* Corresponding author. Mailing address: School of Biosciences, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom. Phone: 44 7800 740215. Fax: 44 115 951 6261. E-mail: alexandre.anesio{at}nottingham.ac.uk.

Applied and Environmental Microbiology, August 2004, p. 4848-4854, Vol. 70, No. 8
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.8.4848-4854.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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