Abstract 
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. 
Ill 
