Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
River Management ◽  
Large River ◽  
Large Rivers ◽  
Pertinent Literature ◽  
Historical Changes ◽  
Time To Learn ◽  
River Fish

<em>Abstract.</em>—This book’s objective is to document historical changes in the fish assemblages of large American rivers, and to determine patterns in and rationale for those changes. In this chapter, we review pertinent literature on large rivers and fish assemblages worldwide and briefly introduce the chapters. We expect that the information contained in this book will aid river management in general, and stimulate similar historical fish assemblage studies elsewhere. There will never be a better time to learn and understand what has been changed and to reverse or slow undesirable changes.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Representative Sample ◽  
Fish Assemblages ◽  
Large River ◽  
Point Sources ◽  
Large Rivers ◽  
Government Agencies ◽  
Key Factors ◽  
Factors Affecting ◽  
Historical Changes ◽  
River Fish

<em>Abstract.</em>—The objective of this synthesis is to summarize patterns in historical changes in the fish assemblages of selected large American rivers, to document causes for those changes, and to suggest rehabilitation measures. Although not a statistically representative sample of large rivers, the book chapters indicated that physical and biological stressors usually had a greater impact on fish assemblages than chemical stressors (where point sources were treated). In particular, flow and channel regulation combined with alien species were key factors affecting large river fish assemblages. And these factors were most pronounced for southwestern U.S. rivers. We hope that such information will aid interested citizens and government agencies in river rehabilitation and river protection or conservation. There will never be a better time to do so.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Relative Abundance ◽  
Mississippi River ◽  
Largemouth Bass ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Large River ◽  
Frequency Of Occurrence ◽  
Abundance And Distribution

<em>Abstract.</em>—An investigation of historical fisheries information for pools 4–13 of the upper Mississippi River (UMR) was conducted to 1) determine the pre-1938 relative abundance and distribution of bluegill <em>Lepomis macrochirus </em>and largemouth bass <em>Micropterus salmoides, </em>2) determine the composition and relative abundance of the preimpoundment fish assemblage, and 3) determine if a shift in frequency of occurrence and relative abundance has occurred due to impoundment.

scholarly journals Shift in a Large River Fish Assemblage: Body-Size and Trophic Structure Dynamics

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0124954 ◽  
Author(s):  
Kyle J. Broadway ◽  
Mark Pyron ◽  
James R. Gammon ◽  
Brent A. Murry
Keyword(s):  
Body Size ◽  
Fish Assemblage ◽  
Trophic Structure ◽  
Large River ◽  
Structure Dynamics ◽  
River Fish

Spatially Dependent Responses of a Large-River Fish Assemblage to Bank Stabilization and Side Channels

2017 ◽  
Vol 146 (5) ◽  
pp. 967-982 ◽  
Author(s):  
Ann Marie Reinhold ◽  
Robert G. Bramblett ◽  
Alexander V. Zale ◽  
Geoffrey C. Poole ◽  
David W. Roberts
Keyword(s):  
Fish Assemblage ◽  
Large River ◽  
Side Channels ◽  
Bank Stabilization ◽  
River Fish

scholarly journals Discontinuities and functional resilience of large river fish assemblages

Ecosphere ◽  
2018 ◽  
Vol 9 (7) ◽  
pp. e02351 ◽  
Author(s):  
Kristen L. Bouska
Keyword(s):  
Fish Assemblages ◽  
Large River ◽  
River Fish

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Water Pollution ◽  
Best Management Practices ◽  
Fish Assemblage ◽  
Municipal Wastewater ◽  
Fish Assemblages ◽  
Primary Objective ◽  
Nonpoint Sources ◽  
Control Programs ◽  
Before And After ◽  
River Fish

<em>Abstract.</em>—A systematic, standardized approach to monitor fish assemblages has been applied in Ohio’s rivers since 1979. A primary objective is the assessment of changes in response to water pollution abatement and other water quality management programs. All major, nonwadeable rivers were intensively sampled using standardized electrofishing methods and a summer–early fall index period. Most rivers were sampled two or three times, before and after implementation of pollution controls at major point source discharges and best management practices for nonpoint sources. A modified and calibrated index of biotic integrity (IBI) was used to demonstrate and evaluate changes at multiple sampling locations in major river segments. An area of degradation value (ADV) and an area of attainment value (AAV) were also calculated from IBI results to demonstrate the magnitude and extent of changes in fish assemblage condition along segments and between sampling years. Positive responses in the IBI and the ADV/AAV were observed 4 to 5 years after implementing improved municipal wastewater treatment. Positive responses were much less apparent in rivers predominantly influenced by complex industrial sources, agricultural nonpoint sources, and extensive hydrologic modifications. The ADV/AAV showed incremental improvements in river fish assemblages, unlike pass/fail IBI thresholds, and tiered IBI biocriteria provided more appropriate benchmarks than chemical, physical, or qualitative biological criteria. The results show the value of standardized and intensive fish assemblage monitoring and the use of tools that reveal the extent and severity of impairments to determine the effectiveness of water pollution control programs.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Water Quality ◽  
Land Management ◽  
Native Species ◽  
Fish Assemblages ◽  
Large River ◽  
Nonnative Species ◽  
Quarter Century ◽  
Aggressive Management ◽  
Major Factors ◽  
River Fish

<em>Abstract.</em>—Fish assemblages in the Verde River, Arizona have changed markedly over the last quarter century. Nonnative fishes increase from headwaters toward the mouth and individual native species decrease. River hydrograph and the introduction of nonnative species appear to be the major factors determining fish assemblages, although information is lacking on water quality and other land management impacts. During floods, native species dominated fish assemblages. By contrast, during droughts and sustained base flows, nonnative fishes increased. The threatened spikedace <em>Meda fulgida </em>has been collected only in the uppermost reach of this desert river and, even here, has been absent since 1997. Five other native species also have become less abundant or rare. Continued monitoring of fish assemblages, comparison with another large southwestern river, the Gila, and aggressive management are critical to sustain the native fish component of this river.

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