Journal
MICROBES AND ENVIRONMENTS
Volume 26, Issue 3, Pages 254-260Publisher
JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE
DOI: 10.1264/jsme2.ME11115
Keywords
Land use; watershed; water; soil; fecal indicator bacteria
Categories
Funding
- Cooperative State Research, Education, and Extension Service, U.S. Department of Agriculture [2009-35102-05212]
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Effects of different land uses on densities of Escherichia coli, enterococci, and Clostridium perfringens in the water and soil of a tropical watershed were investigated. Densities of fecal indicator bacteria (FIBs) in the watershed exhibited a clear land-use dependency in the stream water. Significantly higher concentrations were detected in the urban portion of the stream (417, 420, and 44 CFU 100 mL(-1) for E. coli, enterococci, and C. perfringens, respectively) than in the forest portion (54, 32, and 5 CFU 100 mL(-1) for E. coli, enterococci, and C. perfringens, respectively). High concentrations of FIBs were also detected in the soil of the watershed with concentration ranges of 603-1,820,000, 69-17,000, and 0-525 CFU 100 g soil(-1) for E. coli, enterococci, and C. perfringens, respectively, which however were not affected by the different land uses. Prior cumulative rainfall significantly correlated with concentrations of E. coli and enterococci in the urban stream water (r=0.73-0.87, P < 0.05), but not with the alternative FIB C. perfringens. Poor correlations were observed in the forest reach of the stream for all FIBs. Furthermore, the concentration of C. perfringens only correlated strongly and significantly with E. coli and enterococci in stream water (r=0.70-0.82, P < 0.05), but not in tropical soil, indicating different survival and transport behaviors.
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