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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.

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large rivers
Large Rivers
  • Important longitudinal, horizontal, vertical interactions within rivers
large rivers3
Large Rivers
  • e.g., FPOM - fine particulate organic matter inputs from upstream, floodplain
  • Heterotrophic ---- collector invertebrates ----- fish production
impacted by human modifications
Impacted by Human Modifications
  • Multiple-use conflicts
  • Fishing, other recreation
  • Navigation
  • Flood control
  • Water source
impoundment
Impoundment
  • Flood control, navigation, hydropower
navigation flood control aids
Navigation/Flood Control Aids
  • Dikes, levees, channel stabilization
  • Floodplain reduction - 90% in lower Mississippi River
boat traffic
Boat Traffic
  • Wave action, turbulence, sediment suspension, erosion, dewatering
hydropower hydrographs
Hydropower Hydrographs
  • Altered seasonal, daily flows
cooling water
Cooling Water
  • Intakes, outflows
  • Impingement, entrainment
  • Heated water
pollution
Pollution
  • Sediment, PCBs, sewage
flow diversions
Flow Diversions
  • Irrigation, public needs
the fishery sport fish
The Fishery - Sport Fish
  • Cold large rivers
  • Salmon, trout
the fishery sport fish13
The Fishery - Sport Fish
  • Cool large rivers
  • Walleye, smallmouth bass, northern pike
the fishery sport fish14
The Fishery - Sport Fish
  • Warm large rivers
  • Bluegill, crappie, largemouth bass, catfishes
the fishery sport fish15
The Fishery - Sport Fish
  • Best in unmodified reaches
  • e.g., Missouri River - 2 to 2.5 X more productive
the fishery sport fish17
The Fishery - Sport Fish
  • Modified reaches
  • Best in tailwaters (walleye, sauger), main channel border (sunfish, bass, pike)
the fishery commercial fish
The Fishery - Commercial Fish
  • Often same as sport fish
  • Conflict as sport fishing pressure increases
the fishery commercial fish20
The Fishery - Commercial Fish
  • Typical catch in upper Mississippi River
    • Common carp
    • Catfishes
    • Freshwater drum
the fishery commercial fish22
The Fishery - Commercial Fish
  • Problem - benthophagic fish
  • Uptake of contaminants from sediments
  • PCBs
  • Management concern
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