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|Title:||Aquatic biota associated with channel stabilization structures and abandoned channels in the middle Missouri River|
|Authors:||Iowa State University. Iowa Cooperative Fishery Research Unit.|
Environmental and Water Quality Operational Studies (U.S.)
Atchison, Gary J.
Bachmann, Roger W.
Nickum, John G.
Barnum B. James.
Sandheinrich, Mark B.
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Biological and physical data were collected from main-stem habitats on the Missouri River between river miles 661 and 678 during 1983. Sampling was conducted to describe water quality and fish and benthic macroinvertebrate populations associated with dike, revetment, and abandoned channel habitats. Water quality measurements were rather uniform, except for some small differences between some measurements made in the abandoned channels and those in the main river, indicating a well-mixed system. Thirty-nine fish species comprised the juvenile and adult catch. The revetted bank samples were dominated by larger species, such as the blue sucker and flathead catfish. The dike field had a similar assemblage of larger species with blue sucker, channel catfish, flathead catfish, and goldeye predominating. The dike fields also provided habitat for a wide variety of minnows. The abandoned channels yielded the greatest species richness and overall greatest numbers of fish. The overall abundance of fish larvae in the abandoned channels was much higher than in the main channel and the catch was dominated by sunfishes and gizzard shad. The main channel habitats were found to be of importance for freshwater drum, carp suckers, and common carp. Peak times of larval fish abundance occurred between early June and mid-August. There were differences in the densities and taxonomic composition of the benthic invertebrate communities in the different habitats. The abandoned channel habitats were characterized by fine sediment particles, high benthos densities, and lower number of taxa than found on the rock substrate of the dikes and revetments. The dike pool habitats were characterized by high current velocities, a diversity of sediment types, and low benthic diversity. The dikes and revetments were similar in having large rock substrates and high current velocities . Attached forms such as Hydra were important as were other invertebrates commonly associated with coarse substrates (caddisflies, stoneflies, and clinging mayflies).
|Appears in Collections:||Technical Report|