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Gather Data.2

D - Graphing Overland Precipitation

checkmarkClick here to go to the LAKE ERIE PRECIPITATION site.

  1. Graph the precipitation during 1900.

E - Temperature Changes with Depth

checkmarkClick here to go to the LAKE ONTARIO VERTICAL TEMPERATURE site.

  • This map shows you the water temperature at various depths of Lake Ontario.  The picture in the right lower corner shows the whole lake with lines drawn where the four cross sections are taken.
  1. What is the coldest water temperature in Lake Ontario?
  2. What is the range of depth at which the water is 8 degrees Celsius at cross section "C"?

F - Effect of Foreign Species on Local Animals

checkmarkClick here to go to the HEALTH INDICATOR site.

  1. How is the "health" of Lake Michigan's water life populations measured?
  2. Why does the lack of amphipods affect the fish population?
  3. What do amphipods eat?
  4. Why do you think the amphipods are disappearing?

checkmarkClick here to go to the DIPOREIA site.

  1. When you compare the maps from different years, what can you infer (figure out) about amphipods' population? Diporeia is a type of amphipod.
  2. Why is it important to measure seemingly unimportant things such as the number of invertebrates in the mud at the bottom of lakes?
  3. How do scientists make maps like these?

 

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