Lakhasly

Cellular and subcellular measures of exposure (biomarkers) and effects (bioindica- tors) continue to be developed.However, application of biomarkers in assessing ecological risk remains infrequent and of questionable utility.The primary challenges in using biomarkers/bioindicators to assess risk include the difficulties in

(1) developing stressor-specific, quantitative dose-response functions and (2) project- ing higher-order ecological effects from cellular or subcellular bioindicators.

Cellular and subcellular measures of exposure (biomarkers) and effects (bioindica-
tors) continue to be developed. This development is justified in part by the potential

application of these technologies in supporting ecological risk assessment (ERA).
However, application of biomarkers in assessing ecological risk remains infrequent
and of questionable utility. The following discussion examines the potential for
increasing the utility of biomarkers and bioindicators in ERA. Recent studies suggest
that biomarkers can contribute to most aspects of a commonly used framework for
ERA. Methods that address gene expression (i.e., proteomics) appear particularly
promising in terms of economy in application and significance of results. The primary
challenges in using biomarkers/bioindicators to assess risk include the difficulties in

(1) developing stressor-specific, quantitative dose-response functions and (2) project-
ing higher-order ecological effects from cellular or subcellular bioindicators.