Friday, September 19, 2008

Today we read through the worksheets for the Wawanosh Belgrave Creek Study field trip. We also worked on the pesticide case study. Remember the following info for Monday:
-bring a lunch
-be on the bus no later than 11:45
-wear weather appropriate clothing and footwear for going in the water
-bring bug spray
-you may want to bring a water bottle too.
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2 comments:

Anonymous said...

How do you the last question on the case study?

September 22, 2008 at 7:52 AM
J. Ross-Holton said...

The final question involves drawing a simple food web to show how DDT would be passed along to the top trophic level (eagles) in a lake ecosystem. Refer to the diagram in the case study to show how DDT can become "bioaccumulated" in owls. This may help you. Start by thinking about what kind of plants would be the producers in a lake---they are the bottom of the food web. Then what would be the herbivores, and then what would be the carnivores (including eagles). Arrange them in a simple food food and draw in arrows to show feeding relationships. Notice how a pesticide would become accumulated in the eagles.

September 22, 2008 at 9:09 AM

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