Environmental Management

, Volume 63, Issue 1, pp 124–135 | Cite as

Extended Water-Level Drawdowns in Dammed Rivers Enhance Fish Habitat: Environmental Pool Management in the Upper Mississippi River

  • A. A. CoulterEmail author
  • S. R. Adams
  • M. B. Flinn
  • M. R. Whiles
  • B. M. Burr
  • R. J. Sheehan
  • J. E. Garvey


Environmental Pool Management (EPM) can improve ecosystem function in rivers by restoring aspects of the natural flow regime lost to dam construction. EPM recreates summer baseflow conditions and promotes the growth of terrestrial vegetation which is inundated in the fall, thereby improving habitat heterogeneity for many aquatic taxa. A three-year experiment was conducted wherein terrestrial floodplain areas were dewatered through EPM water-level reductions and the resulting terrestrial vegetation was (1) allowed to remain or (2) removed in paired plots in Mississippi River pool 25. Fish assemblage and abundance were quantified in paired plots after inundation. Abundances of many fish species were greater in vegetated plots, especially for species that utilize vegetation during portions of their life history. Fish assemblages varied more between plot types when the magnitude of EPM water-level drawdowns was greater, which produced greater vegetation growth. Young-of-year individuals, especially from small, early maturing species and/or species reliant on vegetation for refuge, feeding, or life history, utilized vegetated plots more than devegetated plots. Vegetation growth produced under EPM was heavily used by river fishes, including young-of-year individuals, which may ultimately positively influence recruitment. Increased habitat heterogeneity may mitigate some of the negative impacts of dam construction and water-level regulation on river fishes. Annual variability in vegetation responses that occurs under EPM enhances natural environmental variability which could ultimately contribute to increased fish diversity. Low-cost programs like EPM can be implemented as a part of adaptive management plans to help maintain biodiversity and ecosystem health in anthropogenically altered rivers.


Water-level management Dams Adaptive management Mississippi River Environmental flows Moist-soil plants 



This project was funded by the U.S. Army Corps of Engineers, St. Louis District. Thank you to B. Johnson and T. Miller for assistance securing funding and to J. Fedderson and B. Dugger for assistance with project design and data collection. The authors would also like to thank D. Coulter for comments which contributed to the improvement of this manuscript.


This study was funded by the U.S. Army Corps of Engineers, St. Louis District (No grant number).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Ethical Approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

Supplementary material

267_2018_1116_MOESM1_ESM.docx (126 kb)
Supplementary Information


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • A. A. Coulter
    • 1
    Email author
  • S. R. Adams
    • 2
  • M. B. Flinn
    • 3
  • M. R. Whiles
    • 4
  • B. M. Burr
    • 1
  • R. J. Sheehan
    • 1
  • J. E. Garvey
    • 1
  1. 1.Center for Fisheries, Aquaculture, and Aquatic SciencesSouthern Illinois UniversityCarbondaleUSA
  2. 2.Department of BiologyUniversity of Central ArkansasConwayUSA
  3. 3.Department of Biological SciencesMurray State UniversityMurrayUSA
  4. 4.Department of Zoology and Center for EcologySouthern Illinois UniversityCarbondaleUSA

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