A LocalScale Emphasis Type="Italic"In Situ/Emp

Authors: C C Morris T P Simon S A Newhouse

Publish Date: 2005/11/15

Volume: 50, Issue: 3, Pages: 325-334

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Abstract

We propose a formal causal evaluation inference process that uses a localscale in situ approach and provides statistically defensible correlative conclusions for the biological impairment in 303dlisted water bodies Fish assemblage water chemistry and aquatic habitat data from 66 locations in the Limberlost watershed Indiana were collected in August 2003 to evaluate the condition of the watershed Anthropogenic stressors were identified from a numerical classification analysis of fish assemblage data using a biological integrity response gradient Physical and chemical stressors were evaluated relative to the biological integrity response gradient using the Kruskal Wallis analysis of variance by ranks test Three water chemistry variables sodium chloride and barium were associated with biological integrity The percent run habitat channel morphology score and Qualitative Habitat Evaluation Index score varied with the degree of dredging We observed a negative response between the number of species and the biological integrity gradient and a positive response with the percent tolerant individuals This localscale in situ approach to physical and chemical data analysis combined with concurrent biological data collection provided correlative relations to the impaired condition with localized environmental stressorsThis document is intended for the exchange of objective information Mention of trade names or commercial products does not constitute endorsement or recommendation for use Statements or points of view do not necessarily represent the position of the Indiana Department of Environmental ManagementThis project was made possible by the collective efforts of the Biological Studies and Toxicology and Chemistry Sections of the Indiana Department of Environmental Management’s Assessment Branch Special thanks are extended to C L Bridges S G Uddin and D Clark for support and collaboration in designing and implementing this study We also thank J K Morris T Kroeker S Sobat B Blomquist J Butler L Ricke and B Ratcliff for hard work in the field and the laboratory

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