BEACHNET==> link to research article/abstract for E.coli, urban stormwater, and CSOs

["Shannon Briggs" <briggssl@michigan.gov>]

Please see the link for abstracts in the Journal of Great Lakes Research
http://www.iaglr.org/jglr/db/view_contents.php?volume=33&issue=3&mode=toc 

This is the abstract from the link above for the article on E.coli, urban stormwater, and CSOs

J. Great Lakes Res. 33(3):566-580.
Internat. Assoc. Great Lakes Res., 2007
 
Distribution and Fate of Escherichia coli in Lake Michigan Following Contamination with Urban Stormwater and Combined Sewer Overflows

Sandra L. McLellan, Erika J. Hollis, Morgan M. Depas, Meredith Van Dyke, Josh Harris and Caitlin O. Scope, Great Lakes WATER Institute, University of Wisconsin-Milwaukee, 600 E. Greenfield Avenue, Milwaukee, Wisconsin, 53204

ABSTRACT: Escherichia coli distribution and persistence in nearshore Lake Michigan were assessed following heavy rains and sanitary sewer overflow (SSO) and combined sewer overflow (CSO) events over a 5-year period, including an 18-day period following 25.4 cm of rainfall in which intensive studies were conducted following multiple CSO and SSO events. E. coli levels in the Milwaukee estuary and harbor following SSO and CSO events ranged from 104 to nearly 105 CFU/100 mL, which were significantly higher (p £ 0.05) than levels following rainfall alone. Sites outside of the breakwall but within the contamination plume (e.g., within 2 km of the harbor) were an order of magnitude lower. Locations 2-5 km from the harbor ranged from below detection limits, of < 1 to 5 CFU/100 mL. E. coli levels corrected for dilution based on specific conductivity measurements were lower than what would be expected for loss due to dilution alone, suggesting a combination of die-off and dilution, were responsible for the rapid disappearance of these organisms outside of the harbor. E. coli and fecal coliforms measured concurrently demonstrated that fecal coliforms could be recovered longer than E. coli in the open waters of the lake. E. coli isolated directly from sewage treatment plant influent were found to have a marked increase in antibiotic resistance traits for ten antibiotics commonly used in the human population compared with isolates from two animal sources of fecal pollution. However, E. coli obtained from sewage impacted water (n = 2,513) and from stormwater impacted water (n = 1,465) collected the previous year when there were no sewage overflows, were found to have no significant difference (p < 0.05) in the frequency of resistance when comparing the two conditions. E. coli survival characteristics and population dynamics are most likely influenced by multiple factors in complex systems such as the watershed/estuarine/lake environments of the Great Lakes.

KEYWORDS: E. coli, sewage overflows, antibiotic resistance, fecal coliforms, Lake Michigan.

 


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