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Resuspension of Sediment-Associated Escherichia coli in a Natural Stream

^a School of Engineering
^b Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N2G 2W1
^c Department of Geography, University of Guelph, Guelph, Ontario, Canada N2G 2W1
^d Department of Engineering, Nova Scotia Agricultural College, Truro, Nova Scotia, Canada B2N 5E3

View larger version (72K): [in a new window]   Fig. 1. Location of the study watershed and sampling locations.

View larger version (28K): [in a new window]   Fig. 2. Time course of (a) water temperature adjacent to the source cell, (b) Escherichia coli resistant to nalidixic acid (E. coli NAR) concentrations in source cell bed sediments (CFU, colony forming units), and (c) flow.

View larger version (28K): [in a new window]   Fig. 3. Time course of Escherichia coli resistant to nalidixic acid (E. coli NAR) and total suspended solids (TSS) concentrations in water samples collected at distances of (a) 10, (b) 100, (c) 500, and (d) 1700 m downstream of the source cell. Also provided is (e) flow and rainfall. CFU, colony forming units.

View larger version (22K): [in a new window]   Fig. 4. Time course of total suspended solids (TSS) at 100 m, E. coli NAR at 100 m, and flow and bed shear stress during the 24 May storm event. CFU, colony forming units.