Large Rivers Chapter 20 - Winona

Large Rivers Chapter 20 - Winona

Large Rivers Chapter 20 Large Rivers Important longitudinal, horizontal, vertical interactions within

rivers Large Rivers e.g., FPOM - fine particulate organic matter inputs from upstream, floodplain

Heterotrophic ---collector invertebrates ----fish production Impacted by Human Modifications

Multiple-use conflicts Fishing, other recreation Navigation Flood control Water source

Impoundment Flood control, navigation, hydropower Navigation/Flood Control Aids

Dikes, levees, channel stabilization Floodplain reduction - 90%

in lower Mississippi River Boat Traffic Wave action, turbulence, sediment

suspension, erosion, dewatering Hydropower Hydrographs Altered seasonal, daily

flows Cooling Water Intakes, outflows

Impingement, entrainment Heated water Pollution

Sediment, PCBs, sewage Flow Diversions Irrigation, public needs The Fishery - Sport Fish

Cold large rivers Salmon, trout The Fishery - Sport Fish

Cool large rivers Walleye, smallmouth bass, northern pike

The Fishery - Sport Fish Warm large rivers Bluegill, crappie,

largemouth bass, catfishes The Fishery - Sport Fish Best in unmodified reaches

e.g., Missouri River - 2 to 2.5 X more productive Unmodified vs. Modified The Fishery - Sport Fish

Modified reaches Best in tailwaters (walleye, sauger), main channel border (sunfish, bass, pike)

Modified Mississippi River The Fishery Commercial Fish Often same as sport fish

Conflict as sport fishing pressure increases The Fishery Commercial Fish Typical catch in

upper Mississippi River Common carp Catfishes Freshwater drum Mississippi River Catch

The Fishery Commercial Fish Problem benthophagic fish

Uptake of contaminants from sediments PCBs Management concern PCBs in the Mississippi River

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