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Front of classroom. Food Webs. Catalyst: Examine the food web to the right. Tell me at least FIVE conclusions you can draw from it. Write in complete sentences! Don’t talk during the Catalyst!. Agenda. Evolution Mastery Introduction to Environmental Science Food web roles

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Front of classroom

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  1. Front of classroom

  2. Food Webs • Catalyst: • Examine the food web to the right. • Tell me at least FIVE conclusions you can draw from it. Write in complete sentences! Don’t talk during the Catalyst!

  3. Agenda • Evolution Mastery • Introduction to Environmental Science • Food web roles • ActivExpression fun! • Food web interactions • Predation, competition, extinction • MOOOORE ActivExpression fun!!! • Closing/Exit Question

  4. SI 13: Identify scientific evidence that has caused modifications in previous theories

  5. SI 16: Use rules of evidence to examine theories

  6. LS 17: Explain how factors affect gene frequency in a population over time

  7. LS 16: Explain how DNA/fossil evidence supports evolution

  8. LS 15: Compare the embryological development of animals

  9. LS 14: Analyze evidence of evolution

  10. ES 9: Cite and explain examples of adaptations over time

  11. LS 18: Classify organisms from different kingdoms using a dichotomous key

  12. Unit 6 Mastery Overall

  13. Introduction • First, we studied how individual cells work. • Second, we learned how cells fit together into organisms and reproduce. • Then, we discovered how organisms change (evolve) over long periods time. • Now, we will study how groups of these organisms interact and change the environment around us. • We will also look at how our treatment of the environment threatens the survival of the human species. This Is Environmental Science

  14. Objective By the end of today, all SWBAT… • Analyze food webs by predicting the impact of the loss or gain of an organism

  15. Catalyst Review • Examine the food web to the right. • Tell me at least FIVE conclusions you can draw from it.

  16. How Do Organisms Interact? • They eat each other! • Key Point #1: A food web shows all the feeding relationships in an ecosystem. • Ecosystem: all of the living and non-living things in an area.

  17. First, some vocabulary… • Producer: another word for autotroph. Makes its own food through photosynthesis. • Consumer:another word for heterotroph. Eats other things for energy. • Primary consumer: eats producers. • Secondary consumer: eats primary consumers. • Tertiary consumer: eats secondary consumers.

  18. Some things to notice… • Arrows show the flow of energy. So, they point FROM something getting eaten TO whatever is eating it. • A food chain is a path on a food web. From producer to the final consumer. • The most basic level of the food web is the producer. Where does it get its energy from?

  19. Guided Practice (GP) 1 The arrow pointing from seed-eating birds to foxes shows that... • Foxes eat birds • Birds eat foxes • Foxes and birds share food • Foxes and birds compete for the same food

  20. Guided Practice (GP) 1 Although it is not shown in this picture, where does all of this food web’s energy begin? • The Moon • The Earth • The Sun • Fertilizer

  21. Guided Practice (GP) 1 What is the producer in this food web? • Hawks and owls • Squirrels • Plants • Spiders

  22. Guided Practice (GP) 1 Which of the following is a secondary consumer in this food web? • Toads • Plants • Mice • Spiders

  23. Guided Practice (GP) 1 Which of the following is a primary consumer in this food web? • Snakes • Mice • Predaceous insects • Foxes

  24. Guided Practice (GP) 1 I need one volunteer to come up to the board and circle a food chain.

  25. What If…? • Key Point #2: We can use a food web to predict what will happen when we introduce/take away a species • Three important interactions for you to learn.

  26. Food Web Interactions • What do you think will happen to the rabbits, if all the vegetation is destroyed? • If a population loses ALL of its food sources, it will become extinct.

  27. Food Web Interactions • What do you think will happen to the cougar, if all of the deer die? • If a population loses SOME of its food sources, it will decrease in size.

  28. Food Web Interactions • What do you think will happen to the mice, if all of the foxes are eaten by the cougars? • If a population loses its predators, it will increase in size.

  29. Guided Practice (GP) 2 What will happen to the mouse population, if a disease kills all the plants? • All will go extinct • Increase in size • Decrease in size • Reproduce more

  30. Guided Practice (GP) 2 Imagine that a bobcat enters the ecosystem. Bobcats eat insectivorous birds. What will happen to the fox population? • All will go extinct • Increase in size • Decrease in size • Move elsewhere

  31. Guided Practice (GP) 2 Imagine that a disease kills all of the snakes in the ecosystem. What will happen to predaceous insect population? • All will go extinct • Increase in size • Decrease in size • Stop eating herbivorous insects

  32. Guided Practice (GP) 2 What will happen to the squirrel population, if a cow wanders by and eats all the plants? • All will go extinct • Increase in size • Decrease in size • Start eating toads

  33. Guided Practice (GP) 2 What will happen to the rabbit population, if a drought kills all the plants? • All will go extinct • Increase in size • Decrease in size • Eat foxes

  34. Guided Practice (GP) 2 Imagine that a hunter kills all of the hawks and owls in the ecosystem. What will happen to the seed-eating bird population? • All will go extinct • Increase in size • Decrease in size • Begin eating spiders

  35. Guided Practice (GP) 2 Pretend that a falcon enters the ecosystem. Falcons eat toads. What will happen to the snake population? • All will go extinct • Increase in size • Decrease in size • Stop eating toads

  36. Guided Practice (GP) 2 Imagine that a population of bears wanders into the ecosystem. Bears eat foxes. What will happen to the squirrel population? • All will go extinct • Increase in size • Decrease in size • Move elsewhere

  37. Independent Practice • Make your own food web. Your food web must have at least THREE producers, TWO primary consumers, and ONE secondary consumer. • Describe four situations in which an organism enters/leaves your food web. Explain what will happen to the other organisms in your food web as a result.

  38. Key Point Wrap-Up • KP#1: A food web shows all the feeding relationships in an ecosystem. • KP#2: We can use a food web to predict what will happen when we introduce/take away a species • If a population loses ALL of its food sources, it will become extinct. • If a population loses SOME of its food sources, it will decrease in size. • If a population loses its predators, it will increase in size.

  39. Use the food web at right to answer the questions below. What animal eats the elk? What would happen to the rabbit population, if all the grass were to be burned down in a fire? Imagine that a population of foxes wanders into this food web, and eats all the mice. What will happen to the cricket population? Exit Questions

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