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Establishing Cause Effect Relationships in Multi Stressor Environments

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Field bioassessments/ experiments. Simulation modeling. Hybrid methodologies. Causal Criteria ... and Bioassay Experiments. Nutrient- diffusing substrates ... – PowerPoint PPT presentation

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Title: Establishing Cause Effect Relationships in Multi Stressor Environments


1
Establishing Cause- Effect Relationships in
Multi- Stressor Environments
  • John Newberry

2
Pollution in Riverine Environments
  • Multiple sources
  • Effluent exposure
  • Interaction of stressors

3
Impacts
  • Incremental
  • Multiple source
  • Multiple stressor

4
Approaches
  • Laboratory toxicity tests
  • Field bioassessments/ experiments
  • Simulation modeling
  • Hybrid methodologies

5
Causal Criteria
  • Strength of association
  • Consistency of association
  • Specificity of association
  • Time order or temporality
  • Biological gradient
  • Experimental evidence
  • Biological plausibility

6
Field and Bioassay Experiments
  • Nutrient- diffusing substrates (NDS)
  • Exposure bioassays
  • Postexposure bioassays

7
Artificial Stream Experiments
  • Greater complexity
  • Stream mesocosms
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