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• W4283011710 abstract "Abstract Fecal pollution is one of the most prevalent forms of pollution affecting waterbodies worldwide, threatening public health, and negatively impacting aquatic environments. Microbial source tracking (MST) applies polymerase chain reaction (PCR) technology to help identify the source of fecal pollution. In this study, we combine spatial data for two watersheds with general and host-specific MST markers to target human, bovine, and general ruminant sources. Two different PCR technologies were applied for quantifying the targets: quantitative PCR (qPCR) and droplet digital PCR (ddPCR). We found that ddPCR had a higher detection rate (75%) of quantifiable samples compared to qPCR (27%), indicating that ddPCR is more sensitive than qPCR. The three host-specific markers were detected at all sites (n=25), suggesting that humans, cows, and ruminants are contributing to fecal contamination in these watersheds. MST results, combined with watershed characteristics, suggest that streams draining areas with low-infiltration soil groups, high septic system prevalence, and high agricultural land use are at an increased risk for fecal contamination. Microbial source tracking has been applied in numerous studies to aid in identifying the sources of fecal contamination, however these studies usually lack information on the involvement of watershed characteristics. Our study combined watershed characteristics with MST results, applying more sensitive PCR techniques, in addition to watershed characteristics to provide more comprehensive insight into the factors that influence fecal contamination in order to implement the most effective best management practices. Abstract Figure Highlights ddPCR provided higher sensitivity over qPCR when analyzing environmental samples Human markers had an association with the number of septic systems in a watershed Every site had positive detections for all FIB markers Both ruminant markers were associated with low infiltration hydrologic soil groups Combining watershed characteristics with MST testing improved source identification" @default.
• W4283011710 created "2022-06-18" @default.
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• W4283011710 date "2022-06-16" @default.
• W4283011710 modified "2023-09-28" @default.
• W4283011710 title "Using Watershed Characteristics for Improving Fecal Source Identification" @default.
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• W4283011710 doi "https://doi.org/10.1101/2022.06.16.496426" @default.
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