Application of a linear regression model to assess the influence of urbanised areas and grazing pastures on the microbiological quality of rural streams

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Faecal coliform (FC) bacteria were used as a proxy of faecal indicator organisms (FIOs) to assess the microbiological pollution risk for eight mesoscale catchments with increasing lowland influence across north-east Scotland. This study sought to assess the impact of urban areas on microbial contaminant fluxes. Fluxes were lowest in upland catchments where populations are relatively low. By contrast, lowland catchments with larger settlements and a greater number of grazing populations have more elevated FC concentrations throughout the year. Peak FC counts occurred during the summer months (April-September) when biological activity is at its highest. Lowland catchments experience high FC concentrations throughout the year whereas upland catchments exhibit more seasonal variations with elevated summer conditions and reduced winter concentrations. A simple linear regression model based on catchment characteristics provided scope to predict FC fluxes. Percentage of improved grazing pasture and human population explained 90 and 62 % of the variation in mean annual FC concentrations. This approach provides scope for an initial screening tool to predict the impact of urban space and agricultural practice on FC concentrations at the catchment scale and can aid in pragmatic planning and water quality improvement decisions. However, greater understanding of the short-term dynamics is still required which would benefit from higher resolution sampling than the approach undertaken here.

Original languageEnglish
Pages (from-to)7141-7155
Number of pages15
JournalEnvironmental Monitoring and Assessment
Volume186
Issue number11
Early online date9 Jul 2014
DOIs
Publication statusPublished - Nov 2014

Fingerprint

fecal coliform
Linear regression
Catchments
pasture
grazing
catchment
Fluxes
Coliform bacteria
coliform bacterium
summer
agricultural practice
Bioactivity
Water quality
Screening
Pollution
seasonal variation
urban area
Impurities
Sampling
Planning

Keywords

  • faecal coliform
  • microbial pollution
  • prediction
  • urban
  • water

ASJC Scopus subject areas

  • Pollution
  • Management, Monitoring, Policy and Law
  • Environmental Science(all)

Cite this

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title = "Application of a linear regression model to assess the influence of urbanised areas and grazing pastures on the microbiological quality of rural streams",
abstract = "Faecal coliform (FC) bacteria were used as a proxy of faecal indicator organisms (FIOs) to assess the microbiological pollution risk for eight mesoscale catchments with increasing lowland influence across north-east Scotland. This study sought to assess the impact of urban areas on microbial contaminant fluxes. Fluxes were lowest in upland catchments where populations are relatively low. By contrast, lowland catchments with larger settlements and a greater number of grazing populations have more elevated FC concentrations throughout the year. Peak FC counts occurred during the summer months (April-September) when biological activity is at its highest. Lowland catchments experience high FC concentrations throughout the year whereas upland catchments exhibit more seasonal variations with elevated summer conditions and reduced winter concentrations. A simple linear regression model based on catchment characteristics provided scope to predict FC fluxes. Percentage of improved grazing pasture and human population explained 90 and 62 {\%} of the variation in mean annual FC concentrations. This approach provides scope for an initial screening tool to predict the impact of urban space and agricultural practice on FC concentrations at the catchment scale and can aid in pragmatic planning and water quality improvement decisions. However, greater understanding of the short-term dynamics is still required which would benefit from higher resolution sampling than the approach undertaken here.",
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author = "McGrane, {Scott J.} and Doerthe Tetzlaff and Christopher Soulsby",
note = "We are grateful to Audrey Innes for analysing the bacteria samples and the Scottish Alliance for Geography, Environment and Society (SAGES) for funding this research. This research was undertaken by Dr Scott J. McGrane during his doctoral research at the University of Aberdeen.",
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