This document describes the framework and research implementation plans for ecological effects research on aquatic stressors within the National Health and Environmental Effects Laboratory. The context for the research identified within the framework is the common management goal of protecting aquatic systems to prevent degradation of habitat, loss of ecosystem function, and reduced biodiversity. Five main research products for meeting this goal are identified in the framework: (1) methods to predict biological effects of habitat alteration; (2) population, community, and ecosystem stressor-response models; (3) diagnostic tools to determine impairment or causes of impairment to aquatic systems; (4) classification approaches to aid in the prediction and management of problems; and (5) methods and models to support development of ecological criteria. The research implementation plans herein focus on the effects of four aquatic stressors, including habitat alteration, nutrients, suspended and bedded sediments, and toxic chemicals. This approach is consistent with recent scientific consensus, recognizing that these stressors have the greatest potential for causing adverse effects to aquatic ecosystems. In addition, the document outlines research that will develop diagnostic tools for a decision support system for resource managers. The major goals, the critical path for research, specific research projects, and a gap analysis are provided for each of the five research implementation plans along with the time table of research products that will support EPA's Goal 2 (Clean and Safe Water) research under the Government Performance and Results Act.

"September 2002." "EPA 600/R-02-074." Includes bibliographical references.