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Example Stressor-Response Relationships

Stressor Characterization of Exposure: Intensity, Time, and Space Stressor-Response Relationships
Toxic chemical External concentration in medium
Internal concentration in organism
Biomarker
Concentration-response or time-response relationships from controlled experiments or field observational studies; ecological process models.
Dissolved oxygen and oxygen-demanding contaminants (e.g., BOD, COD) Dissolved oxygen concentrations Concentration-response relationships from controlled experiments or field observational studies; ecological process models.
Suspended particles Suspended concentration (e.g., TSS) Concentration-response relationships from controlled experiments or field observational studies.
Settled particles (bed load) Degree of embeddedness, texture Embeddedness- or particle size-response relationships from controlled experiments or field observational studies.
Thermal energy Temperature Thermal tolerances from controlled experiments or field observational studies.
Mineral nutrients Dissolved concentration Concentration-response relationships from controlled experiments or field observational studies.
Ecological process models of eutrophication.
Habitat Structural attributes Attribute-response relationships from field observational studies; ecological process models; habitat suitability models
Water withdrawal/drought Hydrograph and associated summary statistics (e.g., 7Q10) Field observational studies; in-stream flow process models.
Pathogen Presence or abundance of pathogen Controlled laboratory exposures or field observational studies relating pathogen presence with disease or symptoms
Non-indigenous invasive species Presence or abundance of the species Ecological process models (food web, energetic, predator-prey, etc.) or field observational studies.
Effluent Dilution of effluent Effluent dilution - response in the laboratory (e.g., WET)
Contaminated ambient media Location and time of collection
Analysis of medium
Lab or in situ tests using the medium.
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