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Related Experiment Video

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Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

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A methodology for ecosystem-scale modeling of selenium.

Theresa S Presser¹, Samuel N Luoma

¹US Geological Survey, Menlo Park, California 94025, USA. tpresser@usgs.gov

Integrated Environmental Assessment and Management

|September 28, 2010

Summary

This study introduces an ecosystem-scale model to assess selenium (Se) exposure risks, linking water, diet, and predators. The model quantifies Se pathways, improving risk evaluation and regulation for environmental protection.

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Area of Science:

Environmental Science
Ecotoxicology
Biogeochemistry

Background:

Current selenium (Se) risk assessments lack biologically based protocols, despite dietary exposure being the primary route.
Understanding selenium's complex pathways through ecosystems is crucial for effective environmental regulation.

Purpose of the Study:

To develop and validate an ecosystem-scale model for quantifying selenium (Se) processing from water to predators.
To provide a tool for forecasting Se toxicity and translating tissue-based guidelines to dissolved Se concentrations.

Main Methods:

Integrated biogeochemical and physiological factors from laboratory and field studies.
Incorporated loading, speciation, transformation, bioavailability, bioaccumulation in invertebrates, and trophic transfer.
Validated the model using data from 29 historic and recent Se-exposed field sites.

Main Results:

The model successfully links Se concentrations across water, particulate matter, and various food web species tissues.
Demonstrated that safe dissolved Se concentrations vary significantly among ecosystems based on specific ecological and biogeochemical conditions.
Highlighted the critical influence of species choice, food web dynamics, and particulate matter characterization on Se exposure.

Conclusions:

The developed model offers a framework for site-specific Se risk assessment and regulation.
It aids in understanding ecosystem-specific Se exposure pathways and reducing uncertainties in environmental protection.
The model facilitates translating predator tissue Se guidelines to environmentally relevant dissolved Se concentrations.