Monday, November 5, 2007 - 10:00 AM
94-2

E. coli and Enterococcus in a Large Agricultural Watershed: Temporal, Hydrologic and Animal Production Factors.

Thomas Moorman, Mark Tomer, and David James. USDA-ARS, USDA-ARS Natl. Soil Tilth Lab, 2150 Pammel Dr., Ames, IA 50011

Populations of E. coli and Enterococcus were monitored in the South Fork of the Iowa River and the tributaries Tipton Creek and Beaver Creek.  These three drainages have diifering populations of swine and are dominated by corn and soybean production.  Bacterial populations in stream water show strong seasonal trends with lowest populations in winter and greatest populatiuons in late summer.  Although storm events deliver large E. coli and Enterococcus populations in overland flow and tile drainage after manure application, field scale monitoring shows wildlife sources are also important.  The effects of animal distributions and conservation practices are discussed.

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