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Sunlight, season, snowmelt, storm, and source affect E. coli populations in an artificially ponded stream

Science of the Total Environment

By:
, , , ,
DOI: 10.1016/j.scitotenv.2007.10.014

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Abstract

Reducing fecal indicator bacteria, such as Escherichia coli (E. coli), in streams is important for many downstream areas. E. coli concentrations within streams may be reduced by intervening ponds or wetlands through a number of physical and biological means. A section of Dunes Creek, a small coastal stream of southern Lake Michigan, was impounded and studied for 30??months from pre-through post-construction of the experimental pond. E. coli reduction became more predictable and effective with pond age. E. coli followed the hydrograph and increased several-fold during both rainfall and snowmelt events. Seasonally, the pond was more effective at reducing E. coli during summer than winter. Late summer, non-solar reduction or inactivation of E. coli in the pond was estimated at 72% and solar inactivation at 26%. E. coli DNA fingerprinting demonstrated that the winter population was genetically more homogeneous than the summer population. Detection of FRNA coliphages suggests that there was fecal contamination during heavy rain events. An understanding of how environmental factors interact with E. coli populations is important for assessing anticipated contaminant loading and the reduction of indicator bacteria in downstream reaches. ?? 2007.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sunlight, season, snowmelt, storm, and source affect E. coli populations in an artificially ponded stream
Series title:
Science of the Total Environment
DOI:
10.1016/j.scitotenv.2007.10.014
Volume
390
Issue:
2-3
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science of the Total Environment
First page:
448
Last page:
455
Number of Pages:
8