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Scientific Investigations Report 2010–5051

National Water-Quality Assessment Program

Evaluation of Aquatic Biota in Relation to Environmental Characteristics Measured at Multiple Scales in Agricultural Streams of the Midwest: 1993–2004

By Julie A. Hambrook Berkman, Barbara C. Scudder, Michelle A. Lutz, and Mitchell A. Harris

ABSTRACT

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This study evaluated the relations between algal, invertebrate, and fish assemblages and physical environmental characteristics of streams at the reach, segment, and watershed scale in agricultural settings in the Midwest. The 86 stream sites selected for study were in predominantly agricultural watersheds sampled as part of the U.S. Geological Survey’s National Water-Quality Assessment Program. Species abundance and over 130 biological metrics were used to determine which aspects of the assemblages were most sensitive to change at the three spatial scales. Digital orthophotograph-based riparian land use/land cover was used for analyses of riparian conditions at the reach and segment scales. The percentage area of different land-use/land-cover types was also determined for each watershed. Out of over 230 environmental characteristics examined, those that best explained variation in the biotic assemblages at each spatial scale include the following: 1) reach: bank vegetative cover, fine silty substrate, and open canopy angle; 2) segment: woody vegetation and cropland in the 250-m riparian buffer, and average length of undisturbed buffer; and 3) watershed: land use/land cover (both total forested and row crop), low-permeability soils, slope, drainage area, and latitude. All three biological assemblages, especially fish, correlated more with land use/land cover and other physical characteristics at the watershed scale than at the reach or segment scales. This study identifies biotic measures that can be used to evaluate potential improvements resulting from agricultural best-management practices and other conservation efforts, as well as evaluate potential impairment from urban development or other disturbances.

First posted September 28, 2010

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Suggested citation:

Hambrook Berkman, J.A., Scudder, B.C., Lutz, M.A., and Harris, M.A., 2010, Evaluation of aquatic biota in relation to environmental characteristics measured at multiple scales in agricultural streams of the Midwest, 1993–2004: U.S. Geological Survey Scientific Investigations Report, 2010–5051, 24 p.



Contents

Foreword

Abstract

Introduction

Purpose and Scope

Study Area

Methods

Data Collection

Biological Assemblages

Environmental Characteristics

Data Analysis

Biological Assemblages

Biological Metrics

Environmental Characteristics

Relations between Biological Assemblages, Biological Metrics, and Environmental Characteristics

Spatial and Temporal Variability of Biological Metrics

Relations between Biota and Multiscale Environmental Characteristics

Biological Assemblages with Environmental Characteristics

At the Reach Scale

At the Segment Scale

At the Watershed Scale

Biological Metrics with Environmental Characteristics

Algal Metrics

Invertebrate Metrics

Fish Metrics

Spatial and Temporal Variability of Metrics

Discussion of Findings and Comparison with Other Studies

Implications for the Use of Aquatic Biota in Evaluations of Agricultural Best-Management Practices

Summary and Conclusions

Acknowledgments

References Cited



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