Investigation of environmental and land use influence on watershed bacterial contamination using E. coli quantification and 16s identification

Abigail O'Connor, James Wood

Abstract


Wheeling Creek in the Northern Panhandle of West Virginia was monitored for fecal indicator bacterium Escherichia coli (E. coli). Since Wheeling Creek is used recreationally, elevated fecal coliform levels pose potential human health risks including gastrointestinal or respiratory illness.

   The current study included 12 sites spanning 18 stream km. For each site, weekly or bi-weekly bacteria samples were collected from the water column and water chemistry parameters were recorded. Seasonal trends in bacterial contamination and correlations with site parameters including rainfall, water chemistry, and land use were recorded.

   Additionally, monthly water samples from each site were enriched for coliform bacteria, amplified using 16s rRNA primers, and sequenced using Oxford Nanopore’s Flongle technology. Metagenomic analysis was used to determine patterns in the microbial community and note correlations between indicator bacteria and pathogens.

   Concentration of E. coli regularly exceeded the USEPA recommendation of 235 CFU/100 mL at many sites. Two sites averaged over 3,000 CFU/100 mL, while five sites averaged less than 126 CFU/100 mL. Development in the watershed correlated with E. coli concentration. Within the water chemistry parameters measured, turbidity, rainfall, pH, and temperature were the best predictors of site-level E. coli concentration, while pH, temperature, and percent developed land use were the best predictors of watershed E. coli levels. Collectively, these data can elucidate human health risk and inform remediation efforts in the Wheeling Creek watershed.

   This research was made possible by NASA West Virginia Space Grant Consortium, NASA Agreement # # 80NSSC20M0055, and the Wheeling Water Pollution Control Dept.


Keywords


Water quality; Biological impairment; Sequencing; Bacteria

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