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Good Morning!!

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  1. Good Morning!!

  2. Warm-up October 1stDay 2 • Create a food chain using the following organisms. What do your arrows represent?? • Shrew Hawk Grasshopper • Homework Due: Food Chains & Webs packet

  3. Warm-up October 1stDay 2 • Food Chain: • Grasshopper  Shrew  Hawk • The arrows show the flow of ENERGY!!

  4. Activity Instructions • You will play the role of a hawk, shrew, or grasshopper… • 1. Grasshoppers get to collect food in their stomach (brown paper bag) while shrews and hawks watch their prey. • 2. Shrews hunt their prey (grasshoppers). **When you catch your prey you get their stomach! • 3. Hawks hunt shrews. Living shrews can still hunt grasshoppers until you get “eaten.”

  5. Return to your seats… • All living animals should count the contents of their stomachs. • Count & record # light colored cereal • Count & record # of dark colored cereal Count them up!

  6. Class Data

  7. Class Data

  8. Oh no!! A pesticide! • Farmers sprayed the crop that the grasshoppers were eating with a pesticide. • All dark colored cereal represents this pesticide!

  9. What does this mean?? • All living shrews with half or more dark colored cereal are dead due to the pesticide! • The hawk with the most dark colored cereal will live, BUT so much of the pesticide accumulated in your body that the eggs of you and your mate will have a very thin shell and will not hatch!

  10. How do toxic substances enter a food chain?? • Grasshopper  Shrew  Hawk

  11. Biomagnification • Biomagnification is the increase in concentration of a pollutant from one link in a food chain to another • Can result in the accumulation of chemicals in species higher in the food chain.

  12. Another Example • DDT (dichlorodiphenyltrichloroethane) was applied to crops to control insect damage. • In the early 1970s, it was discovered that DDT had entered the food chain. • Fish ate insects sprayed with DDT. • Hawks, eagles, and pelicans at the fish.

  13. We thought DDT was a good things!

  14. However… • DDT became concentrated in the birds body’s and their egg shells became very thin. • The weight of the adult bird would crush the eggs in the nesting process. • This impacted the population of our national bird, the bald eagle!