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Threshold Development in Ecosystem Monitoring: A Guide for Regulatory Compliance

Discover the process of setting thresholds in ecosystem monitoring, from triggers for investigation to control actions. Learn to interpret biological responses and chemical data to determine impairments. This guide outlines the steps for regulatory and management threshold development, including tiered interpretation methods and verification of effects.

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Threshold Development in Ecosystem Monitoring: A Guide for Regulatory Compliance

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  1. Ecosystem 2 Thresholds

  2. Tiered Interpretation Process • 1. Trigger for further investigation or threshold development • Biol responses (incl. mode of action endpoints) • or chemistry • “free from” objectives • 2. Regulatory/management threshold development • Mode of action (MOA) based

  3. Definitions/uses • Trigger • Follow up monitoring • Biol verification • Threshold development priorities • Control actions • Threshold • Impairment designation • Reg. or Management action

  4. Threshold Development CEC from Trigger Dose/response data compilation or generation Determine MOA Distribution of effects relative to dose Sensitive Receptor Organisms Conceptual Model Threshold -Action -Impairment -WQO

  5. Potential Triggers • Chemical • Trend • Present at active concentrations (single chem/TEQ) • Biological effect verified • Action by other agencies/EU • Biological • Exposure evident (MOA endpoints/biomarker) • Tissue response • Organism response • Population response (too late!)

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