%0 Journal Article
%T Associated Use Attainment Response between Multiple Aquatic Assemblage Indicators for Evaluating Catchment, Habitat, Water Quality, and Contaminants
%A Thomas P. Simon
%A Charles C. Morris
%J Journal of Ecosystems
%D 2014
%I Hindawi Publishing Corporation
%R 10.1155/2014/893795
%X Use attainability analysis (UAA) at a watershed scale typically relies on the assumption that indicator organisms are responding similarly to the same environmental stressor. Factors explaining variance in fish, crayfish, and macroinvertebrate assemblage structure and function were investigated with emphasis on catchment and reach scale land use, habitat, contaminants, and water quality variables. Habitat quality scores ranged from 25 to 85 (average ). The substrate score, instream cover, riffle-run score, and channel score were primary factors contributing to declining habitat quality. Factor analysis found that four factors explained 69% of the contributed variance in fish assemblage, two factors accounted for 56% of variance in macroinvertebrate assemblages, and two factors explained 49% of the variance in crayfish assemblages. Overall drivers of assemblage structure were associated with broad scale issues of wastewater treatment, groundwater, and land use. Our results show that fish, macroinvertebrate, and crayfish assemblages respond to similar broad scale stimulus; however, the specific constituents responsible for the stress may vary with the magnitude of the cumulative stress, which may be expressed by each organismal group differently. Our data suggest that varying organismal groups can respond independently and stress reflected in one assemblage may not necessarily be observed in another since each organismal group is measuring different aspects of the environment. 1. Introduction Regional scale use attainability analysis (UAA) is a structured scientific assessment of the factors affecting the fulfillment of the fishable/swimmable goals of the United States Clean Water Act (Section 101(a)(2)). Watershed use attainment is determined by evaluating multiple indicators occurring within the same reach and exposed to the same stressors. The assumption is that various trophic level biological indicators will respond similarly to stressors [1, 2]. Many state and federal agencies assume that biological assemblages are measuring the same features of the environment [3, 4]. Oftentimes, the response between various indicators is divergent or contradictory, which has been attributed to differing trophic level impact to chemical, land use, and habitat characteristics [2]. When agreement between indicators is not achieved, the UAA created an elaborate interpretation to describe disagreement between biological assemblage indicators. This has resulted in statements of full support, partial support, indeterminate, or not meeting aquatic life designated uses.
%U http://www.hindawi.com/journals/jeco/2014/893795/