Assessment of Water Quality in James Brook, Groton, Massachusetts Bioassessment and Chemical...
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Transcript of Assessment of Water Quality in James Brook, Groton, Massachusetts Bioassessment and Chemical...
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Assessment of Water Quality in James Brook,Groton, Massachusetts
Bioassessment and Chemical Testing
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Goals of the Study
• Assess change in the water quality of James Brook over time
• Evaluate the probably contributions of different non-point sources of pollution on water quality and ecosystem health
• Provide baseline work that will serve to evaluate a future restoration project
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The Basic Model
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Bioassessment: how it works
• Diversity Indices (limiting factors)– Simple Diversity– Shannon-Weiner
• Biotic Indices– Presence/Absence of Intolerant Species– Beck’s Index (many others exist)
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Beck’s Biotic Index
• Class I Organisms (Sensitive or Intolerant)• Class II Organisms (Facultative)• Class III Organisms (Tolerant)
BBI = 2 x (number of Class I Organisms) + (number of Class II Organisms)
Why aren’t Class III organisms used?
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Costs and Benefits
Advantages
• Likely to identify effects of a broader range of pollutants• Likely to identify pollutants discharged over time as opposed to the
snapshot of chemical testing• Less costly
– Equipment– Training
Disadvantages
• Does not identify specific pollutants• Habitat and Ecological factors influence species distributions• Will not indicate pollutants that have no effect on non-human• Selection of groups for study is critical to valuable information
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Chemical Testing
Choice of Pollutants
• Watershed Analysis• Indicator Pollutants• Field Observation
• DO• BOD• pH• Colorimetry• Turbidity• More sophisticated testing
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Watershed Analysis
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Indicator Pollutants
Based on sources of pollution in the watershed– Residential– Agriculture and Forestry– Industrial– Roadways– Hazardous Waste Sites
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Use of the Analysis in Planning
http://www.nashuariverwatershed.org/5yr_plan/subbasins/james.htm