Understanding Lakes

eutrophication graphic

Figure 22

WATER QUALITY IMPACTS ASSOCIATED WITH EUTROPHICATION

  • Noxious algae (scums, blue-greens, taste and odor, visual)
  • Excessive macrophyte growth (loss of open water)
  • Loss of clarity (secchi depth goes down)
  • Possible loss of macrophytes (via light limitation by algae and periphyton)
  • Low dissolved oxygen (loss of habitat for fish and fish food)
  • Excessive organic matter production (smothering eggs and bugs)
  • Blue-green algae inedible by some zooplankton (reduced food chain efficiency)
  • "Toxic" gases (ammonia, H2S) in bottom water (more loss of fish habitat)
  • Possible toxins from some species of blue-green algae
  • Chemical treatment by lakeshore homeowners or managers may result (copper, diquat, 2,4-D, etc.)
  • Drinking water degradation from treatment disinfection byproducts
  • Carcinogens, such as chloroform (from increased organic matter reacting with disinfectants like chlorine)
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