Historical patterns of river stage and fish communities as criteria for operations of dams on the Illinois river

The hydrologic regime of the Illinois River has been altered over the past 100 years. Locks and dams regulate water surface elevations and flow, enabling commercial navigation to continue year round. This study relates changes in water surface elevation to fish abundance in the river, and establishes target criteria for operating locks and dams. Using long-term records of daily river stage, we identified ecologically meaningful hydrological parameters for eight gage locations along the Illinois River. Inter-annual variability of a long-term fisheries dataset beginning in 1957 was related to variability in stage, flood and recession duration, frequency, timing, and rate of change of water levels. Reversals in water surface elevation, maximum stage levels, and length of the spring flood were the most important parameters influencing abundance of age-zero fishes in annual collections. Smallmouth buffalo (Ictiobus bubalus), black crappie (Pomoxis nigromaculatus), freshwater drum (Aplodinotus grunneins), and white bass (Morone chrysops) were most abundant in samples during years that approximated the natural water level regime. Of the 33 hydrologic parameters evaluated for the entire water year from an Illinois River gage site on La Grange Reach, all except average stage in January and Julian date (JD) of maximum stage had moderate or high hydrologic alteration based on the historical range of variation (RVA). The highest degree of hydrologic alteration was for minimum stage levels (1-day, 3-day, and 7-day), rate-of-rise, and rate-of-fall. Other parameters that have been severely altered were 30-day minimum stage, 90-day maximum stage, and the annual number of water level reversals. Operations of the La Grange and Peoria locks and dams could be modified so water level variability would approximate that of the late 1800s, when fish and wildlife resources were abundant. The water regime could be regulated to maintain navigation and improve conditions for native plants and animals without increasing flood damages. Copyright © 2002 John Wiley & Sons, Ltd.

[1]  Richard E. Sparks,et al.  Need for Ecosystem Management of Large Rivers and Their Floodplains These phenomenally productive ecosystems produce fish and wildlife and preserve species , 1995 .

[2]  David P. Braun,et al.  A Method for Assessing Hydrologic Alteration within Ecosystems , 1996 .

[3]  William E. Dietrich,et al.  Hydraulic Food-Chain ModelsAn approach to the study of food-web dynamics in large rivers , 1995 .

[4]  C.J.F. ter Braak,et al.  CANOCO Reference Manual and User's Guide to Canoco for Windows: Software for Canonical Community Ordination (Version 4) , 1998 .

[5]  R. Sparks,et al.  THE NATURAL FLOW REGIME. A PARADIGM FOR RIVER CONSERVATION AND RESTORATION , 1997 .

[6]  Peter B. Bayley,et al.  Understanding Large River-Floodplain EcosystemsSignificant economic advantages and increased biodiversity and stability would result from restoration of impaired systems , 1995 .

[7]  K. Irons,et al.  Evaluation of the flood-pulse concept based on statistical models of growth of selected fishes of the upper Mississippi River system , 1999 .

[8]  David P. Braun,et al.  How much water does a river need , 1997 .

[9]  J. Allan,et al.  Functional Organization of Stream Fish Assemblages in Relation to Hydrological Variability , 1995 .

[10]  N. LeRoy Poff,et al.  Implications of Streamflow Variability and Predictability for Lotic Community Structure: A Regional Analysis of Streamflow Patterns , 1989 .

[11]  R. Sparks,et al.  An Electrofishing Survey of the Illinois River, 1959-1974 , 1975 .

[12]  Alan P. Covich,et al.  Sustaining Ecosystem Services in Human-Dominated Watersheds: Biohydrology and Ecosystem Processes in the South Platte River Basin , 1999, Environmental management.

[13]  C. Braak.  Canonical Correspondence Analysis: A New Eigenvector Technique for Multivariate Direct Gradient Analysis , 1986 .

[14]  I. Schlosser.  Flow regime, juvenile abundance, and the assemblage structure of stream fishes , 1985 .

[15]  Brian Richter,et al.  A spatial assessment of hydrologic alteration within a river network , 1998 .

[16]  Keith F. Walker,et al.  Flow variability and the ecology of large rivers , 1998 .

[17]  R. Norris,et al.  What is river health , 1999 .

[18]  Handbook of freshwater fishery biology , 1951 .

[19]  Yao Yin,et al.  Naturalization of the flood regime in regulated rivers the case of the upper Mississippi River , 1998 .

[20]  F. Douglas Shields,et al.  Can Large Rivers Be Restored?Most restoration projects are only attempts to rehabilitate selected river sections to a predetermined structure and functio , 1995 .

[21]  W. Richardson,et al.  Past, Present, and Future Concepts in Large River Ecology How rivers function and how human activities influence river processes , 1995 .

[22]  R. Welcomme.  Relationships between fisheries and the integrity of river systems , 1995 .

[23]  C. Braak,et al.  Canonical correspondence analysis and related multivariate methods in aquatic ecology , 1995, Aquatic Sciences.

[24]  J. Finn,et al.  Streamflow regulation and fish community structure , 1988 .

[25]  P. Bayley.  The flood pulse advantage and the restoration of river‐floodplain systems , 1991 .

[26]  J. Karr.  Defining and measuring river health , 1999 .