Asked by PRADUMN KUMAR SINGH | 11th Mar, 2013, 08:22: PM

Expert Answer:

The main effects of eutrophication are an
  • increase in plant and animal biomass
  • increase in growth of rooted plants, e.g. reeds
  • increase in turbidity (cloudiness) of water
  • increase in rate of sedimentation
  • development of anoxic conditions (low oxygen levels)
  • decrease in species diversity
  • change in dominant biota (e.g. carp replace trout and blue-green algae replace normal algae) and an
  • increase in the frequency of algal blooms.  
Agricultural runoff, urban runoff, leaking septic systems, sewage discharges, eroded streambanks, and similar sources can increase the flow of nutrients and organic substances into aquatic systems. These substances can overstimulate the growth of algae, creating conditions that interfere with the recreational use of lakes and estuaries, and the health and diversity of indigenous fish, plant, and animal populations.
Because of the high concentration of organisms in a eutrophic system, there is often a lot of competition for resources and predator pressure. This high degree of competition and the sometimes-high chemical or physical stress increase the struggle for survival in eutrophic systems.

Answered by  | 13th Mar, 2013, 08:11: AM

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