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    Long-Term Persistence and Leaching of Escherichia coli in Temperate Maritime Soils

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    AEM 76 (2010) Brennan et al_Re ...
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    Author
    Brennan, Fiona P.
    O'Flaherty, Vincent
    Kramers, Gaelene
    Grant, Jim
    Richards, Karl G.
    Keyword
    Enteropathogen contamination of groundwater
    Escherichia coli leaching
    lysimeter experiment
    temperate maritime soils
    Date
    2009-12
    
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    URI
    http://hdl.handle.net/11019/179
    Citation
    Brennan, F. P., V. O’Flaherty, G. Kramers, J. Grant, and K. G. Richards (2010) Long-term Persistence and leaching of Escherichia coli in Temperate Maritime Soils. Applied and Environmental Microbiology 76, 5, p. 1449–1455. DOI: 10.1128/AEM.02335-09.
    Abstract
    Enteropathogen contamination of groundwater, including potable water sources, is a global concern. The spreading on land of animal slurries and manures, which can contain a broad range of pathogenic microorganisms, is considered a major contributor to this contamination. Some of the pathogenic microorganisms applied to soil have been observed to leach through the soil into groundwater, which poses a risk to public health. There is a critical need, therefore, for characterization of pathogen movement through the vadose zone for assessment of the risk to groundwater quality due to agricultural activities. A lysimeter experiment was performed to investigate the effect of soil type and condition on the fate and transport of potential bacterial pathogens, using Escherichia coli as a marker, in four Irish soils (n 9). Cattle slurry (34 tonnes per ha) was spread on intact soil monoliths (depth, 1 m; diameter, 0.6 m) in the spring and summer. No effect of treatment or the initial soil moisture on the E. coli that leached from the soil was observed. Leaching of E. coli was observed predominantly from one soil type (average, 1.11 0.77 CFU ml 1), a poorly drained Luvic Stagnosol, under natural rainfall conditions, and preferential flow was an important transport mechanism. E. coli was found to have persisted in control soils for more than 9 years, indicating that autochthonous E. coli populations are capable of becoming naturalized in the low-temperature environments of temperate maritime soils and that they can move through soil. This may compromise the use of E. coli as an indicator of fecal pollution of waters in these regions.
    Funder
    Irish Research Council for Science, Engineering and Technology
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1128/AEM.02335-09
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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