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Applied and Environmental Microbiology, March 2000, p. 956-965, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Increase in Bacterial Community Diversity in Subsurface Aquifers Receiving Livestock Wastewater Input

Jang-Cheon Cho and Sang-Jong Kim*

Department of Microbiology, College of Natural Sciences, Seoul National University, Seoul 151-742, South Korea

Received 16 August 1999/Accepted 10 December 1999

Despite intensive studies of microbial-community diversity, the questions of which kinds of microbial populations are associated with changes in community diversity have not yet been fully solved by molecular approaches. In this study, to investigate the impact of livestock wastewater on changes in the bacterial communities in groundwater, bacterial communities in subsurface aquifers were analyzed by characterizing their 16S rDNA sequences. The similarity coefficients of restriction fragment length polymorphism (RFLP) patterns of the cloned 16S ribosomal DNAs showed that the bacterial communities in livestock wastewater samples were more closely related to those in contaminated aquifer samples. In addition, calculations of community diversity clearly showed that bacterial communities in the livestock wastewater and the contaminated aquifer were much more diverse than those in the uncontaminated aquifer. Thus, the increase in bacterial-community diversity in the contaminated aquifer was assumed to be due to the infiltration of livestock wastewater, containing high concentrations of diverse microbial flora, into the aquifer. Phylogenetic analysis of the sequences from a subset of the RFLP patterns showed that the Cytophaga-Flexibacter-Bacteroides and low-G+C gram-positive groups originating from livestock wastewater were responsible for the change in the bacterial community in groundwater. This was evidenced by the occurrence of rumen-related sequences not only in the livestock wastewater samples but also in the contaminated-groundwater samples. Rumen-related sequences, therefore, can be used as indicator sequences for fecal contamination of groundwater, particularly from livestock.

* Corresponding author. Mailing address: Department of Microbiology, College of Natural Sciences, Seoul National University, Kwanak-Gu, Seoul 151-742, South Korea. Phone: 82-2-880-6704. Fax: 82-2-889-9474. E-mail: sjkimm{at}plaza.snu.ac.kr.

Applied and Environmental Microbiology, March 2000, p. 956-965, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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