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Related Concept Videos

Sampling Plans01:23

Sampling Plans

Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...

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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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Published on: September 26, 2017

Selecting objectively defined reference sites for stream bioassessment programs.

Adam Gordon Yates1, Robert C Bailey

  • 1Department of Biology, The University of Western Ontario, 1151 Richmond St. N., London, Ontario, Canada, N6A 5B7. adam.yates@ec.gc.ca

Environmental Monitoring and Assessment
|November 11, 2009
PubMed
Summary
This summary is machine-generated.

This study presents an objective GIS-based method for selecting freshwater reference sites. It identifies sites with minimal human impact, crucial for ecological condition assessments in understudied regions.

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Area of Science:

  • Environmental Science
  • Ecology
  • Geographic Information Systems (GIS)

Background:

  • Selecting appropriate reference sites is critical for assessing freshwater ecosystem health.
  • Existing methods can be subjective or data-intensive, limiting application in large or remote areas.

Purpose of the Study:

  • To develop and demonstrate an objective, GIS-based method for selecting reference sites in freshwater ecosystems.
  • To enable rapid and cost-effective identification of candidate reference sites, even in understudied regions.

Main Methods:

  • Utilized widely available GIS data to group potential sites by natural environmental characteristics.
  • Developed a human activity gradient to score sites based on exposure to human activities, particularly agriculture.
  • Defined a reference-test site boundary to maximize distinctiveness based on human activity levels.

Main Results:

  • Classified headwater basins in southwestern Ontario into six natural groups based on surface geology.
  • Identified significant variation in agricultural activity exposure among basins.
  • Selected reference basins demonstrated substantially lower agricultural activity compared to test sites within most groups.

Conclusions:

  • The developed GIS-based method provides an objective, rapid, and cost-effective approach for identifying freshwater reference sites.
  • This method is particularly valuable for assessing ecological condition in large, remote, or understudied regions.
  • The approach enhances the reliability of ecological assessments by ensuring the selection of sites with minimal anthropogenic disturbance.