Retention and remobilization dynamics of fine particles and microorganisms in pastoral streams

Drummond, Jennifer; Davies‐Colley, Robert J.; Stott, Rebecca; Sukias, J.P.S.; Nagels, John W.; Sharp, Alice; Packman, Aaron I.

doi:10.1016/j.watres.2014.08.025

Cited by 72 publications

(103 citation statements)

References 53 publications

(68 reference statements)

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“…Higher DSS rates affected by fine particles may be attributed to more denitrifiers and oxygen-limited micro-environments, which fine particles can provide. Drummond et al (2014) found that both microbial metabolism and remobilization are more dependent on fine particles, which may reveal higher metabolism rates and anoxic conditions. Besides, fine particles occupy a larger specific surface area and can provide more surface area for bacteria to attach, which may result in higher density of denitrifying bacteria on SPS (Jia et al, 2016).…”

Section: Discussionmentioning

confidence: 95%

Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Yao

Zhang

et al. 2016

Environmental Pollution

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Section: Discussionmentioning

confidence: 95%

Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Yao

Zhang

et al. 2016

Environmental Pollution

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“…Recent research showed a two-log reduction in culturable E. coli from the sediment surface (top 1 cm) to 4 cm in depth (Pachepsky and Shelton, 2011). Generally, the top 2 cm of sediment is considered to have high FIO abundance whereas below 2 cm has significantly lower abundance (Ferguson et al, 1996; Haller and Amedegnato, 2009; Drummond et al, 2014a). Distinct seasonality of bacteria in sediments has been observed, with greater abundance in autumn-winter months compared to spring-summer months (Goyal et al, 1977; Crabill et al, 1999).…”

Section: Abundance and Distribution Of Fecally Derived Bacteria And Vmentioning

confidence: 99%

“…The settling rate in the field, however, is likely to be lower than these estimates and vary depending on other factors such as turbulence due to waves, wind and tides (Malham et al, 2014). Jamieson, R. et al (2005) suggested that high bed shear stress limits the exchange between sediments and water column, although in contrast Drummond et al (2014a) found that deposition of both E. coli and inert fluorescent beads occur rapidly, with 74% of the E. coli in the top 3 cm. Biofilms, vegetation, organic debris and flocs are likely to reduce the deposition and exchange of FIOs and pathogens to the sediment bed (Arnon et al, 2010; Drummond et al, 2014a,b).…”

Section: Sediments As a Sink/source Of Fecal Bacteria And Viruses?mentioning

confidence: 99%

“…Human pathogenic bacteria and viruses released from point (e.g., wastewater treatment plants) and diffuse sources (e.g., agricultural land) frequently contaminate water bodies downstream and therefore represent a potential risk to human health (e.g., during recreation, contamination of food and drinking water). A large proportion of the pathogenic organisms present in water may also become associated with the sediment, which can be subject to resuspension (Davies et al, 1995; Anderson et al, 2005; Drummond et al, 2014a) and could represent a significant mechanism for delivering pathogens to coastal waters (Yamahara et al, 2007). In coastal and estuarine environments, the survival of fecal indicator organisms (FIOs; indicating the potential presence of pathogenic bacteria and viruses) is positively linked to the concentration of suspended matter in the water column (Howell et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Abundance and Distribution of Enteric Bacteria and Viruses in Coastal and Estuarine Sediments—a Review

et al. 2016

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The long term survival of fecal indicator organisms (FIOs) and human pathogenic microorganisms in sediments is important from a water quality, human health and ecological perspective. Typically, both bacteria and viruses strongly associate with particulate matter present in freshwater, estuarine and marine environments. This association tends to be stronger in finer textured sediments and is strongly influenced by the type and quantity of clay minerals and organic matter present. Binding to particle surfaces promotes the persistence of bacteria in the environment by offering physical and chemical protection from biotic and abiotic stresses. How bacterial and viral viability and pathogenicity is influenced by surface attachment requires further study. Typically, long-term association with surfaces including sediments induces bacteria to enter a viable-but-non-culturable (VBNC) state. Inherent methodological challenges of quantifying VBNC bacteria may lead to the frequent under-reporting of their abundance in sediments. The implications of this in a quantitative risk assessment context remain unclear. Similarly, sediments can harbor significant amounts of enteric viruses, however, the factors regulating their persistence remains poorly understood. Quantification of viruses in sediment remains problematic due to our poor ability to recover intact viral particles from sediment surfaces (typically <10%), our inability to distinguish between infective and damaged (non-infective) viral particles, aggregation of viral particles, and inhibition during qPCR. This suggests that the true viral titre in sediments may be being vastly underestimated. In turn, this is limiting our ability to understand the fate and transport of viruses in sediments. Model systems (e.g., human cell culture) are also lacking for some key viruses, preventing our ability to evaluate the infectivity of viruses recovered from sediments (e.g., norovirus). The release of particle-bound bacteria and viruses into the water column during sediment resuspension also represents a risk to water quality. In conclusion, our poor process level understanding of viral/bacterial-sediment interactions combined with methodological challenges is limiting the accurate source apportionment and quantitative microbial risk assessment for pathogenic organisms associated with sediments in aquatic environments.

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“…Excessive soil erosion from upland areas resulting in the transport of soil particles with bound organic matter, nutrients, microbes, or pollutants into the rivers and reservoirs is considered as a major environmental problem (Drummond et al, 2014;Lal et al, 2007;Pimentel et al, 1995;Stoate et al, 2001). The processes of soil particle mobilization and transportation within agriculturally used fields, including the transfer into streams and rivers, have been extensively studied (Báčová and Krása, 2016;Boardman, 2003;Lal, 1998;Neal and Anders, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the flood wave transformation and the sediment resuspension in a small regulated stream in an agricultural catchment

Zumr

Dostál

Devátý

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. This paper presents the methodology used for artificial flood experiments conducted in a small artificial, trained (regulated) channel on the Nučice experimental agricultural catchment (0.5 km 2 ), central Czech Republic, and the results of the experiments. The aim was to monitor the transformation of the flood wave and the sediment transport within the channel. Two series of experiments were carried out in contrasting initial conditions: (a) in September, when the stream banks were dry, the baseflow was negligible, and the channel was fully overgrown with vegetation; and (b) in March, when the stream banks were almost water saturated, the baseflow was above the annual average, and there was no vegetation present. Within each campaign, three successive flood waves, each with an approximate volume of 17 m 3 and peak flow of ca. 40 L s −1 , were pumped into the upper part of the catchment drainage channel. The transformation of the flood wave and the sediment transport regime within an approximately 400 m long channel section were monitored by measuring the discharge, the turbidity, and the electrical conductivity in three profiles along the stream. On the basis of the results, it was concluded that there is a considerable amount of deposited sediment, even in the well-trained and straight channel that can be re-mobilized by small floods. Part of the recorded sediment therefore originates from the particles deposited during previous soil erosion events. The flood waves initiated in dissimilar instream conditions progressed differently -we show that the saturation of the channel banks, the stream vegetation and the actual baseflow had a strong influence on the flood transformation and the sediment regime in the channel. The sediment moves quickly in winter and early spring, but in the later part of the year the channel serves as a sediment trap and the resuspension is slower, if dense vegetation is present.

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Retention and remobilization dynamics of fine particles and microorganisms in pastoral streams

Cited by 72 publications

References 53 publications

Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Abundance and Distribution of Enteric Bacteria and Viruses in Coastal and Estuarine Sediments—a Review

Experimental determination of the flood wave transformation and the sediment resuspension in a small regulated stream in an agricultural catchment

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