Graduate Program

Biological Sciences

Degree Name

Master of Science (MS)

Semester of Degree Completion

2007

Thesis Director

James McGaughey

Thesis Committee Member

Scott Meiners

Thesis Committee Member

Robert Fischer

Abstract

Total heterotroph bacteria populations in the Sangamon River in east central Illinois, U.S.A. were monitored during a period between June and October in 2003 and 2004. Fecal coliforms (FC) were also monitored during this period in 2004. The four sites monitored were upstream and downstream of the Sanitary District of Decatur (SOD). All areas ofthe river monitored showed similar populations ofboth total heterotrophs and FCs. No correlations could be made between increases in populations of total heterotrophs or FC in relation to flow rate, dissolved oxygen, or total solids. Most sites were found to exceed the recommended amount ofFC for recreational waterways as determined by the USEP A during all sampling dates. Total heterotrophs showed little variation. In general, FCs were more responsive to both month and site than were total heterotrophs. Some differences were seen in FCs in comparison to month and site. The greatest populations ofFCs were found in October and at the downstream sites. Further monitoring may need to be completed to determine the origin ofthe FC since these levels indicate a possible pathogenic threat to those using the stream for recreation.

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