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A biomonitor for tracking changes in the availability of lakewater cadmium over space and time

Human and Ecological Risk Assessment

By:
, ,
DOI: 10.1080/10807030801934838

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Abstract

Determining the exposure of organisms to contaminants is a key component of Ecological Risk Assessments (ERAs). Effective estimates of exposure consider not only the total concentrations of contaminants in an organism's surroundings but also the availability of the contaminants to organisms. Contaminant availability can be inferred from mechanistic models and verified by measurements of contaminant concentrations in organisms. We evaluated the widespread lake-dwelling insect Chaoborus as a potential biomonitor for use in exposure assessments for three metals: cadmium (Cd), copper (Cu), and zinc (Zn). We show that larvae of this midge maintain constant their concentrations of the essential metals Cu and Zn and thus cannot be used to monitor them. In contrast, larval Cd concentrations varied widely both among lakes and in a given lake over time. We were able to relate these variations in biomonitor Cd to changes in lakewater Cd and pH using the Free Ion Activity Model (FIAM). Our results suggest that Chaoborus larvae could be used as an effective tool for estimating the Cd exposure of organisms in lakes for the purposes of ERAs.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A biomonitor for tracking changes in the availability of lakewater cadmium over space and time
Series title:
Human and Ecological Risk Assessment
DOI:
10.1080/10807030801934838
Volume
14
Issue:
2
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
229
Last page:
242
Number of Pages:
14