9/11 Pg. 15 Food Webs - PowerPoint PPT Presentation

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9/11 Pg. 15 Food Webs

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  1. 9/11 Pg. 15 Food Webs

  2. 9/11 Pg. 15 Food Webs Commensalism Mutualism Parasitism

  3. Ecology research library time on Thursday and Friday • Peer Editing on Friday (be ready) • Paper due Thursday, Sept. 18 • Quiz #4 on Friday • Interims come out Friday • Ecology test is Thursday, Sept. 18th • Presentation sign up’s for extra credit on the board. • Sign up by Friday 9/11 Class Business Pg. 15 Food Webs

  4. 9/23 Objective Pg. 18 Food Webs • Analyze food webs by predicting the impact of the loss or gain of an organism

  5. LION KING VIDEO CLIP • https://www.youtube.com/watch?v=4fYLEhqYGIU

  6. Producers and consumer interact with anothers to form food chains.

  7. SUN • Key Point #1: • The ___________ is the source of all energy.

  8. Source What does the sun supply with energy?

  9. Where does all of the energy enter the food chain? • Key Point #2: • All energy begins with the producer

  10. SOURCE PRODUCERS Who consumes the producers?

  11. ENERGY SOURCE PRODUCERS Herbivore Omnivore Carnivore

  12. Key Point #3: • Primary consumer: Eats producers • Secondary consumer: Eats primary consumers • Tertiary consumer: Eats secondary consumers

  13. ENERGY SOURCE Secondary Consumer Tertiary Consumer PRODUCERS Primary Consumer Herbivore Omnivore Carnivore

  14. Organisms in food chains are connected by: • Arrows • Key Point #4: • Arrows show the flow of energy

  15. OR

  16. Key Point #5: • Arrows point TO the organism receiving energy • Tip: arrow points from the food into the belly of the predator.

  17. A food web is made of multiple food chains

  18. The arrow pointing from seed-eating birds to foxes shows that... A. Foxes eat birds B. Birds eat foxes C. Foxes and birds share food D. Foxes and birds compete for the same food A

  19. What is the producer in this food web? A. Hawks and owls B. Squirrels C. Plants D. Spiders C

  20. Which of the following is a secondary consumer in this food web? A. Toads B. Plants C. Mice D. Spiders D

  21. But what happens if the food web gets interrupted? • Suppose the wolves eat ALL of the chickens and there are no chickens left? What do you think would happen?

  22. Food Web Interactions • What do you think will happen to the rabbits, if all the vegetation is destroyed? • Key Point #7: Loss of food sources= extinction

  23. Food Web Interactions • What do you think will happen to the cougar, if all of the deer die? • Key Point #8: Loss of SOME of food sources= decrease in size

  24. Food Web Interactions • What do you think will happen to the mice, if all of the foxes are eaten by the cougars? • Key Point #9: Loss of PREDATORS= increase in size

  25. What will happen to the mouse population, if a disease kills all the plants? A. All will go extinct B. Increase in size C. Decrease in size D. Reproduce more A

  26. Imagine that a bobcat enters the ecosystem. Bobcats eat insectivorous birds. What will happen to the fox population? A. All will go extinct B. Increase in size C. Decrease in size D. Move elsewhere C

  27. Imagine that a disease kills all of the snakes in the ecosystem. What will happen to predaceous insect population? A. All will go extinct B. Increase in size C. Decrease in size D. Stop eating herbivorous insects B

  28. Does the food web end with the eagle? • Eventually, nutrients need to be returned back to the soil. • Key Point #10: Decomposers • Examples? • Bacteria and fungi • Break down corpses, waste, and vegetation

  29. 10% rule

  30. Library Work Time • Quietly WALK down to the library. Find a computer and begin typing up your Ecology research paper. • This paper is due next Thursday!

  31. Pg. 12 Food Webs 2/3 Daily Catalyst • 1. Which organism is both the predator and the prey? • a. A • b. B • c. C • d. D • 2. What is the energy source for all food webs? • 3. True or False, The arrows indicate that organism C eats organisms D.

  32. 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 C

  33. Pg. 12 Food Webs 2/3 Daily Catalyst • 1. Which organism is both the predator and the prey? • a. A • b. B • c. C • d. D • C • 2. What is the energy source for all food webs? • The sun • 3. True or False, The arrows indicate that organism C eats organisms D. • False, the arrow shows organism D eats organism C

  34. 2/3 Class Business • Quiz #4 on Friday • Ecology Test Wednesday, February 12th • Ecology work time this week

  35. 2/3 Agenda • Daily Catalyst • Class Business • Food Web notes • 10% rule • Quiz #3 • Trade, grade, and track • Work Time

  36. 2/3 Objective • Analyze food webs by predicting the impact of the loss or gain of an organism • Page 12 Food Webs

  37. But what happens if the food web gets interrupted? • Suppose the wolves eat ALL of the chickens and there are no chickens left? What do you think would happen?

  38. Food Web Interactions • What do you think will happen to the rabbits, if all the vegetation is destroyed? • 1. If a population loses ALL of its food sources, it will become extinct.

  39. Food Web Interactions • What do you think will happen to the cougar, if all of the deer die? • 2. If a population loses SOME of its food sources, it will decrease in size.

  40. Food Web Interactions • What do you think will happen to the mice, if all of the foxes are eaten by the cougars? • 3. If a population loses its predators, it will increase in size.

  41. 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 A

  42. 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 C

  43. 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 B

  44. Does the food web end with the eagle? • Explain the “Circle of life” • Eventually, nutrients need to be returned back to the soil. • Decomposers • Examples? • Bacteria and fungi • Break down corpses, waste, and vegetation

  45. Food Webs

  46. Trophic Levels Level in the food web

  47. Energy Inefficacy 0. 1% 10% 1% HEAT 10% 10% 10% rule 100% • Key Point #1: • Only ____ of the energy in a food web is passed from one trophic level to the next. • 90% is given off as __________ • Called the _______