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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 chapter 20 l.jpg
Large RiversChapter 20


Large rivers l.jpg
Large Rivers

  • Important longitudinal, horizontal, vertical interactions within rivers


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Large Rivers

  • e.g., FPOM - fine particulate organic matter inputs from upstream, floodplain

  • Heterotrophic ---- collector invertebrates ----- fish production


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Impacted by Human Modifications

  • Multiple-use conflicts

  • Fishing, other recreation

  • Navigation

  • Flood control

  • Water source


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Impoundment

  • Flood control, navigation, hydropower


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Navigation/Flood Control Aids

  • Dikes, levees, channel stabilization

  • Floodplain reduction - 90% in lower Mississippi River


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Boat Traffic

  • Wave action, turbulence, sediment suspension, erosion, dewatering


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Hydropower Hydrographs

  • Altered seasonal, daily flows


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Cooling Water

  • Intakes, outflows

  • Impingement, entrainment

  • Heated water


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Pollution

  • Sediment, PCBs, sewage


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Flow Diversions

  • Irrigation, public needs


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The Fishery - Sport Fish

  • Cold large rivers

  • Salmon, trout


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The Fishery - Sport Fish

  • Cool large rivers

  • Walleye, smallmouth bass, northern pike


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The Fishery - Sport Fish

  • Warm large rivers

  • Bluegill, crappie, largemouth bass, catfishes


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The Fishery - Sport Fish

  • Best in unmodified reaches

  • e.g., Missouri River - 2 to 2.5 X more productive



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The Fishery - Sport Fish

  • Modified reaches

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



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The Fishery - Commercial Fish

  • Often same as sport fish

  • Conflict as sport fishing pressure increases


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The Fishery - Commercial Fish

  • Typical catch in upper Mississippi River

    • Common carp

    • Catfishes

    • Freshwater drum



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The Fishery - Commercial Fish

  • Problem - benthophagic fish

  • Uptake of contaminants from sediments

  • PCBs

  • Management concern



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