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LTRMP Technical Report 2014–T001

LTRMP logo A product of the Long Term Resource Monitoring Program, an element of the
U.S. Army Corps of Engineers’ Upper Mississippi River Restoration-Environmental Management Program


Relationship of Weed Shiner and Young-of-Year Bluegill and Largemouth Bass Abundance to Submersed Aquatic Vegetation in Navigation Pools 4, 8, and 13 of the Upper Mississippi River, 1998–2012

By Steven A. DeLain and Walter A. Popp

Thumbnail of and link to report PDF (2.11 MB)Abstract

Aquatic vegetation provides food resources and shelter for many species of fish. This study found a significant relationship between increases in submersed aquatic vegetation (SAV) in four study reaches of the Upper Mississippi River (UMR) and increases in catch-per-unit-effort (CPUE) of weed shiners (Notropis texanus) and age-0 bluegills (Lepomis macrochirus) and largemouth bass (Micropterus salmoides) when all of the study reaches were treated collectively using Long Term Resource Monitoring Program (LTRMP) vegetation and fish data for 1998–2012. The selected fishes were more abundant in study reaches with higher SAV frequencies (Pool 8 and Lower Pool 4) and less abundant in reaches with lower SAV frequencies (Pool 13 and Upper Pool 4). When each study reach was examined independently, the relationship between SAV frequency and CPUE of the three species was not significant in most cases, the primary exception being weed shiners in Lower Pool 4. Results of this study indicate that the prevalence of SAV does affect relative abundance of these vegetation-associated fish species. However, the poor annual relationship between SAV frequency and age-0 relative abundance in individual study reaches indicates that several other factors also govern age-0 abundance. The data indicate that there may be a SAV frequency threshold in backwaters above which there is not a strong relationship with abundance of these fish species. This is indicated by the high annual CPUE variability of the three selected fishes in backwaters of Pool 8 and Lower Pool 4 when SAV exceeded certain frequencies.

First posted February 28, 2014

For additional information contact:
Upper Midwest Environmental Sciences Center
U.S. Geological Survey
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La Crosse, WI 54603
http://www.umesc.usgs.gov/

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Suggested citation:

DeLain, S.A., and Popp, W.A., 2014, Relationship of weed shiner and young-of-year bluegill and largemouth bass abundance to submersed aquatic vegetation in Navigation Pools 4, 8, and 13 of the Upper Mississippi River, 1998–2012: A technical report submitted to the U.S. Army Corps of Engineers’ Upper Mississippi River Restoration-Environmental Management Program from the U.S. Geological Survey, Technical Report 2014–T001, 29 p., https://pubs.usgs.gov/mis/ltrmp2014-t001.



Contents

Preface

Acknowledgments

Abstract

Introduction

Study Area

Methods

Results

Discussion

References Cited

Appendix 1


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