April 29 th , 2013

1. Warm - Up: 1) What is the difference between a chain and a web?2) In 2 minutes, write a definition for each, and compare what you wrote with the person sitting next to you. April 29th, 2013

2. April 29th, 2013 The following slides are numbered 1-24. For today’s assignment: Write the number and an answer to the question (don’t write the question)

3. 1 Factors in an ecosystem: How do biotic compare to abiotic? • All living parts of a habitat • Plants • Animals • Bacteria • All non-living parts of a habitat • Water • Soil • Rocks • Fire

4. 2 Are these animals biotic or abiotic factors?

5. 3 Biotic or Abiotic?

6. 4 Biotic or Abiotic?

7. Biotic or Abiotic? 5

8. 6 Biotic or Abiotic?

9. Why are plants called producers? 7 energy +CO2 +H2O = sugar + O2 “plant food” The ultimate source of life is the sun Plants use the sun’s energy to make food in a process called photosynthesis Examples- cactus, trees, algae, phytoplankton

10. Herbivores- plant-eaters Carnivores- meat-eaters Omnivores- eat plants & meat Scavengers – a carnivore that feeds on body of dead organism Decomposers- organisms that break down wastes & dead organisms & return materials to ecosystem 8 What are consumers?

11. 9 What is a food chain? • A sequence that links a species by its feeding relationships • Example: grass  cottontail  hawk

12. Model that shows the network of feeding relationships, and the flow of energy in the ecosystem Food webs show all the connected food chains What is a food web? 10

13. 11 What do decomposers eat?

14. April 30th, 2013 Today’s Warm-Up  Draw two food chains for two different carnivores. AGENDA Any presentations? The following slides are numbered 13-24. For today’s assignment: Write the number and an answer to the question (don’t write the question) QUIZ using ecosystems poster

15. 12 What is an energy pyramid? • Diagram that compares energy used by producers, primary consumers, and secondary consumers • Each level is a called a trophic level, and it is occupied by an organism

16. Energy is lost as it flows UP a level Carnivores are at the top Herbivores are at the 2nd level Producers are at the bottom 13 What happens at each feeding level?

17. 14 Why are bears at the top?

18. 15 Why are there so many producers?

19. 16 Is this a producer or a consumer? Reef Shark The reef shark gets energy by eating parrotfish and triggerfish.

20. 17Producer or Consumer? Triggerfish The triggerfish gets energy by eating shrimp.

21. 18 Producer or Consumer? Shrimp The shrimp gets energy by eating phytoplankton.

22. 19 Producer or Consumer? Phytoplankton Phytoplankton get energy from the sun.

23. 20 Producer or Consumer? Sea Sponge Sea sponge gets energy by eating zooplankton.

24. 21 Producer or Consumer? Zooplankton Zooplankton get energy by eating phytoplankton.

25. 22 Producer or Consumer? Parrotfish The parrotfish gets energy by eating algae

26. 23Producer or Consumer? Sea Turtle The sea turtle gets energy by eating algae.

27. 24 Producer or Consumer? Algae Algae get their energy from the sun.

28. food chain compared to food web It moves like a cycle It has few organisms Plant to animal Animal to animal Compare: • It goes in many directions • It has many organisms • Plant to animal 1, animal 2, … Both show what organisms eat, and the flow of energy

29. End.

30. April 30th, 2013 What features enable fish to survive underwater? (Give two examples) Why do snakes live so well in the desert? Why do mosquitoes need people? For today’s assignment: Write the number and an answer to the question (don’t write the question)