Variability of E. coli in streambed sediment and its implication for sediment sampling

Salam, Sadia; McDaniel, Rachel; Bleakley, Bruce H.; Amegbletor, Louis; Mardani, Sara

doi:10.1016/j.jconhyd.2021.103859

Cited by 3 publications

(7 citation statements)

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“…The values of FIB concentrations in this work were comparable with observations of other authors in temperate climates (Pachepsky & Shelton, 2011). Salam et al (2021) saw 4-997 CFU gdw −1 . Bragina et al ( 2017) observed concentrations in the range from 10 2 to 10 6 gdw −1 .…”

Section: Discussionsupporting

confidence: 92%

“…A possible factor could be that materials entering the stream in summer had more organic fractions. Our results support the recommendation of Salam et al (2021), who indicated the need to study the effect of seasons on the sediment sampling results.…”

Section: Discussionsupporting

confidence: 89%

“…Arrival with runoff, direct deposition of animal waste, die-off, or growth, entering with the groundwater, and resuspension/settling during high flow events all can alter FIB concentrations in sediment. We concur with Salam et al (2021) that the high sampling uncertainty and sample size analysis imply that a single grab sample may not be able to adequately represent FIB concentrations in the sediment without substantial error.…”

Section: Discussionsupporting

confidence: 85%

“…Research at streams larger than the one in our study resulted in coefficients of variation that were larger than in this work. At the sites on the Sioux River watershed, the coefficients of variation for the log E. coli computed from the data of Salam et al (2021) were in the range of 0.16-0.32. We note that high small-scale variability has been encountered in previous works within the bacteria source areas along water bodies and creeks.…”

Section: Discussionmentioning

confidence: 99%

“…So far, the literature on indicator populations in stream bottom sediments has been relatively scarce as compared with the literature on water column populations. In particular, information on spatial variability in fecal indicator bacteria (FIB) sediment concentrations is limited (Salam et al., 2021; Stocker et al., 2019). Such information presents the necessary component of FIB sediment monitoring design.…”

Section: Introductionmentioning

confidence: 99%

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Multiscale spatiotemporal variability of fecal indicator bacteria and associated particle size distributions in the sandy bottom sediments of a Pennsylvania creek

Pachepsky,

Harriger,

Panko Graff

et al. 2023

J of Env Quality

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Concentrations of the fecal indicator bacteria (FIB) Escherichia coli and enterococci are used to assess microbial impairment in irrigation and recreation water sources. Whereas the FIB concentrations’ variability at large temporal scales such as seasons, and large spatial scales encompassing different land use has been studied, the knowledge about smaller‐scale variability remains sparse. This work aimed to research the small‐scale variability of E. coli and enterococci in a montane creek with sandy bottom sediments. Sediment samples were collected weekly for a year in triplicate at sampling sites in a forested headwater, an agricultural area, and a mixed urban‐agricultural area. The average weekly change in concentrations was from two times at the forested site to five times at the urban‐agricultural site. Mean relative deviations from averages across sampling locations increased from ‐25% at the forested site to 45% at the urban‐agricultural site. This trend was also observed separately over cold and warm seasons. Over a week without precipitation, E. coli concentrations decreased on average by 20% in warm period and by45% in cold period; the enterococci concentration declined by 12% in both cold and warm periods. The sediment particle size distributions were significantly different among the three sites and between cold and warm seasons. Rankings of sediment fine mass fractions and FIB concentrations were positively correlated at two of three sampling sites in more than 70% of observation dates. The results of this work indicate the need to evaluate the uncertainty of sediment FIB concentrations before designing sediment FIB monitoring quality.This article is protected by copyright. All rights reserved

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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