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Wednesday, January 27 • 11:00am - 11:20am
A Comparison of Fish Assemblages Between Wing Dam and Chevron Dike Structures In The Middle Mississippi River

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AUTHORS: John West

ABSTRACT: Chevron dikes are a relatively new structure designed by the U.S. Army Corps of Engineers to aide navigation by concentrating flow and inducing channel scour. They have also been justified for promoting physical habitat and habitat heterogeneity. To date, only a few studies of fish community have occurred for these structures. Since 1993, river miles 29-80 on the Middle Mississippi have been monitored for fish community structure and water quality for the Long Term Resource Monitoring Program (LTRMP). With this program, several habitats are sampled which include artificially manipulated river structures. However, chevrons are not included in the sampling protocol because chevrons were constructed well after the program sampling methods were established. Also, the Open Rivers and Pool 26 are the only two of six LTRMP reaches that have chevrons. The Open Rivers reach has seven chevron dikes which occur from river miles 32-36. To date, only sporadic trotlining, electrofishing, and trawling from the Missouri Department of Conservation and the U.S. Army Corps. of Engineers have been done to evaluate these chevrons. The objective of this study is to compare fish community assemblages between traditional wing dike structures and chevron dikes using LTRMP electrofishing and hoop netting.

Wednesday January 27, 2016 11:00am - 11:20am EST
Gerald Ford

Attendees (7)