Identifying Fecal Contamination Sources in the Grand NERR

The Grand Bay National Estuarine Research Reserve (GNDNERR) has a history of elevated fecal coliform counts; however, the source of the contamination is unknown.

Images of Enterococcus which is a fecal indicator bacteria.

Monthly sampling took place over the course of a year at six sites within the main watershed of the GNDNERR and two sites upstream in the bayous. Having the two sites upstream allowed for a better understanding of how rainfall affects fecal contamination throughout the estuary.

Quantitative polymerase chain reaction (qPCR) was used for microbial source tracking to identify levels of potential fecal sources from humans, feral hogs, and birds within the estuary as well as the concentrations of enterococcus, a fecal indicator bacteria.

Amanda Free, Extension Program Associate

amf654@msstate.edu

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