Spatial and temporal variation of fecal indicator organisms in two creeks in Beltsville, Maryland

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2016-05-26 DOI:10.2166/WQRJC.2016.044

M. Stocker, J. Rodriguez-Valentin, Y. Pachepsky, D. Shelton

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引用次数: 26

Abstract

Evaluation of microbial water quality is commonly based on monitoring populations of fecal indicator organisms (FIO) such as E. coli (EC) and enterococci. The occurrence of elevated FIO concentrations in surface waters after storm events is well documented and has been attributed to runoff and sediment resuspension. The reasons for FIO concentration variation under baseflow conditions are less clear. The objective of this study was to quantify the variability of EC and enterococci in two small streams running through agricultural land use areas. FIO concentrations were measured at upstream and downstream locations under baseflow conditions. Concentrations were not significantly different along cross-sections of the streams. Diurnal concentration trends were observed at each of the sampling locations. Significant differences in concentrations between upstream and downstream locations were noted for both creeks during baseflow periods when no runoff or sediment resuspension occurred. A hypothetical explanation is that indicator organisms are released from sediments during baseflow conditions due to the effect of groundwater influx into streams or due to the motility of indicator organisms. If confirmed, this hypothesis may affect our understanding of the role of sediments in the microbial quality of surface waters.

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马里兰州贝尔茨维尔两条小溪粪便指示生物的时空变化

微生物水质的评价通常基于监测粪便指示生物(FIO)的种群，如大肠杆菌(EC)和肠球菌。风暴事件后地表水中FIO浓度升高的发生有充分的记录，并归因于径流和沉积物再悬浮。基流条件下FIO浓度变化的原因尚不清楚。本研究的目的是量化在流经农业用地区的两条小溪中肠球菌和肠球菌的变异。在基流条件下，测量了上游和下游位置的FIO浓度。沿河流横截面的浓度差异不显著。在每个采样点观察了日浓度趋势。在没有径流或泥沙再悬浮发生的基流期间，两条小溪的上游和下游位置的浓度存在显著差异。一种假设的解释是，在基流条件下，由于地下水流入溪流的影响或由于指示生物的运动，指示生物从沉积物中释放出来。如果得到证实，这一假设可能会影响我们对沉积物在地表水微生物质量中的作用的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.