Great Lakes Populations

Great Lakes Populations
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  • Do you want to learn about populations in the Great Lakes in the 1960s through 1970s?
  • Sure!
  • There are a few things that caused populations to decline. Some of these things are DDT, phosphorus, and zebra mussels
  • What did the DDT do?
  • It is a chemical that once it made its way into the water, harmed aquatic life
  • Oh wow. Thank god it's banned now. What did the phosphorus do?
  • The phosphorus helps the algae to grow. The algae can take oxygen out of the water causing many fish to die. Phosphorus is still used on detergents today although it has been banned.
  • Hopefully it won't cause more problems. What did the zebra mussels do?
  • The zebra mussels make the water clearer my eating smaller organisms. This helps algae to reproduce and grow.
  • Did all of these things have an impact on the populations in the 1960s-1970s?
  • Yes  they did. But now, most of these problems have been fixed causing the populations to go back up. That's it.
  • Oh no. I hope this stuff never happens again! I'm scared!
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