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Scientific Investigations Report 2007–5076 |
By Jeffrey W. Frey and Brian J. Caskey
Prepared in cooperation with the Indiana Department of Environmental Management, Division of Water, Assessment Branch
ONLINE ONLY
An analysis of existing nutrient, habitat, basin-characteristics, and biological-community (fish and invertebrate) data assessed significant relations between nutrients and biological data. Data from 1998 through 2000 for 58 sites in the Upper Wabash River Basin, Lower Wabash River Basin, and tributaries to the Great Lakes and Ohio River Basins were analyzed. Correspondence analysis was used to assess significant relations among nutrients, habitat, basin-characteristics, and biological-community data. Canonical correspondence analysis was used to identify which environmental parameters most influenced the biological communities. When all 58 sites were assessed, six biological-community attributes, metric scores, or site scores were statistically sigificant but weak. When a subset of data was analyzed for eight headwater streams in one ecoregion to minimize the naturally occurring variability associated with the 58 sites, the strength of the relations increased and 24 attributes, metric scores, or site scores were significantly related. Fish-community composition in the 58 sites was most influenced by habitat and land use but not by nutrients. The invertebrate-community composition in the 58 sites was most influenced by habitat, land use, soils, and one nutrient (total Kjeldahl nitrogen [TKN]).
Abstract
Introduction
Purpose and Scope
Description of the Study Area
Site Selection and Study Methods
Watershed Monitoring Program of the Indiana Department of Environmental Management
Field Methods of the Indiana Department of Environmental Management
Nutrients
Biological Communities
Habitat
Basin-Characteristics Data
Nutrient Data
Data Analysis
Correspondence Analysis
Canonical Correspondence Analysis
Nutrient, Habitat, and Basin-Characteristics Data and Relations with Fish and Invertebrate Communities
Fish-Community Composition
Invertebrate-Community Composition
Nutrient Relations to the Biological-Community Attributes, Metric Scores, and Site Scores
Relations of the Biological Community to the Environmental Parameters
Summary
Acknowledgments
References
Appendixes
1–2. Maps showing:
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