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Environmental Monitoring and Assessment

, Volume 156, Issue 1–4, pp 343–360 | Cite as

Multi-scale landscape factors influencing stream water quality in the state of Oregon

  • Maliha S. Nash
  • Daniel T. Heggem
  • Donald Ebert
  • Timothy G. Wade
  • Robert K. Hall
Article

Abstract

Enterococci bacteria are used to indicate the presence of human and/or animal fecal materials in surface water. In addition to human influences on the quality of surface water, a cattle grazing is a widespread and persistent ecological stressor in the Western United States. Cattle may affect surface water quality directly by depositing nutrients and bacteria, and indirectly by damaging stream banks or removing vegetation cover, which may lead to increased sediment loads. This study used the State of Oregon surface water data to determine the likelihood of animal pathogen presence using enterococci and analyzed the spatial distribution and relationship of biotic (enterococci) and abiotic (nitrogen and phosphorous) surface water constituents to landscape metrics and others (e.g. human use, percent riparian cover, natural covers, grazing, etc.). We used a grazing potential index (GPI) based on proximity to water, land ownership and forage availability. Mean and variability of GPI, forage availability, stream density and length, and landscape metrics were related to enterococci and many forms of nitrogen and phosphorous in standard and logistic regression models. The GPI did not have a significant role in the models, but forage related variables had significant contribution. Urban land use within stream reach was the main driving factor when exceeding the threshold (≥35 cfu/100 ml), agriculture was the driving force in elevating enterococci in sites where enterococci concentration was <35 cfu/100 ml. Landscape metrics related to amount of agriculture, wetlands and urban all contributed to increasing nutrients in surface water but at different scales. The probability of having sites with concentrations of enterococci above the threshold was much lower in areas of natural land cover and much higher in areas with higher urban land use within 60 m of stream. A 1% increase in natural land cover was associated with a 12% decrease in the predicted odds of having a site exceeding the threshold. Opposite to natural land cover, a one unit change in each of manmade barren and urban land use led to an increase of the likelihood of exceeding the threshold by 73%, and 11%, respectively. Change in urban land use had a higher influence on the likelihood of a site exceeding the threshold than that of natural land cover.

Keywords

Nutrients Nitrogen Phosphorus Enterococci Grazing potential index GPI Logistic regression Oregon 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Maliha S. Nash
    • 1
  • Daniel T. Heggem
    • 1
  • Donald Ebert
    • 1
  • Timothy G. Wade
    • 2
  • Robert K. Hall
    • 3
  1. 1.U.S. EPALas VegasUSA
  2. 2.U.S. EPAResearch Triangle ParkUSA
  3. 3.U.S. EPA Region 9San FranciscoUSA

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