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Block Day- January 12, 2012

Block Day- January 12, 2012. Homework : study for… Food Web Checkup on Friday

morgan-vazquez
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Block Day- January 12, 2012

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  1. Block Day- January 12, 2012 • Homework: study for… • Food Web Checkup on Friday Bell-Ringer: Two students were talking about grades. One student said “the purpose of test corrections is just to raise your grade.” The second student said “that’s true, you can improve your grade by doing test corrections but that’s not their only purpose.” • What do you think the purpose of test corrections is—other than just raising your grade?

  2. To learn the information. That is why you are required to explain why your answer was wrong and why the correct answer is right. • To study for later tests. That is why you are required to write out the question.

  3. Make a logbook entry– Food Chains and Food Webs-1/12/12

  4. Common Forest Organisms: Big Leaf Maple Millipede Salamander Hawk Garter Snake

  5. Food Chain Food chain- A single pathway of energy transfer through an ecosystem as organisms eat one another. Big Leaf Maple Millipede Salamander Garter Snake Hawk Today’s objective: Using a food web to illustrate and analyze how energy flows through an ecosystem.

  6. It’s all about ENERGY! Arrows show direction of ENERGY flow: NOT direction of eating: Grass Cow Cow Grass

  7. Food Web • Insert the following organisms into your diagram to convert your food chain into a food web: Club Moss Banana Slug Shrew Bullfrog

  8. Food Web Shrew Food WEB Hawk Big Leaf Maple Garter Snake Millipede Salamander Food CHAIN Banana Slug Club Moss Bullfrog

  9. Classifying organisms by energy intake Producer- Gets energy from the sun. Consumer- Gets energy from eating other organisms. Herbivore- eats plants Carnivore- eats animals Omnivore- eats plants and animals

  10. Producers • Place a capital P next to all the organisms that are producers in your food web.

  11. Food Web Shrew P Hawk Big Leaf Maple Garter Snake Millipede Salamander P Banana Slug Club Moss Bullfrog

  12. Trophic levels Trophic level- An organism’s position in food chain. All organisms in the same position in a food chain are in the same trophic level. Maple Millipede Salamander Snake Hawk (1°) Primary/First Consumer (2°) Secondary Consumer (3°) Third Consumer (4°) Fourth Consumer Producer

  13. Primary, Secondary, Tertiary & Quaternary Consumers • Place a “1°” next to any consumer that can act as a FIRST (primary) consumer… • A “2°” next to any consumer that can act as a secondary consumer… • A “3°” for third consumers… • And a “4°” for fourth consumers.

  14. Food Web 2° Shrew 5° 4° 3° 4° P 1° 2° 3° 2° Hawk 1° Big Leaf Maple Garter Snake Millipede Salamander P 1° Banana Slug Club Moss 2° 3° Bullfrog

  15. Biotic & Abiotic Factors Biotic Factors – The living components of an ecosystem. • Plants, animals, bacteria, etc. Abiotic Factors– the non-living components of an ecosystem • Sunlight, Water, Temperature, Minerals, Salinity (salt content), Space, Rocks/soil

  16. Abiotic Factor • Add the following abiotic factor to your foodweb: • Sunlight • NOTE: Use a different shape to show that this factor is different from the previous biotic factors.

  17. LIGHT Food Web 2° Shrew 3° 4° 5° 4° P 1° 2° 3° 2° Hawk 1° Big Leaf Maple Garter Snake Millipede Salamander P 1° Banana Slug Club Moss 2° 3° Bullfrog

  18. ECOSYSTEMS Ecosystems include both living (biotic) and non-living (abiotic) components

  19. “FOODWEB PRACTICE”

  20. Draw a food web with the 7 organisms using arrows to show the direction of energy flow. • Label the trophic level of each organism. • Add 1 abiotic node and explain its effect/importance to your network

  21. LIGHT HAWK MOCKING BIRD TREE DAISIES PAINTED LOCUST LAVA LIZARD SNAKE SCORPION

  22. LIGHT 3rd HAWK 4th 2nd MOCKING BIRD PRODUCER 1st 2nd 3rd TREE DAISIES PAINTED LOCUST LAVA LIZARD SNAKE SCORPION 2nd

  23. 10% RULE

  24. What causes the numbers of individuals in a population to decrease from producer to top level consumers?

  25. Graph of Energy Activity data

  26. Pyramid of energy example

  27. 10% Rule in Ecology • An average of only 10% of the energy in one trophic level is passed to the next trophic level.

  28. 10% 90% lost as heat 10% rule...

  29. 10% 90% lost as heat 10% rule diagrams...

  30. 10% 90% lost as heat 10% rule diagrams...

  31. ? Cal ? Cal ? Cal 1000 Cal How much energy is at each level?

  32. 1 Cal 10 Cal 100 Cal 1000 Cal How much energy is at each level? 9 Cal as heat 90 Cal as heat 900 Cal as heat

  33. 10% Rule • Why do you think only 10% of the total energy from 1 trophic level is passed to the next?

  34. 3 Reasons for decrease in available energy • Energy is “used up” for daily life activities. • Not all organisms that die are eaten by animals in the next trophic level. • Not all parts of an organism are eaten and digested for energy.

  35. Conclusions about energy flow 1. How does the amount of energy change as it passes through an ecosystem? • The amount of available energy decreases as it passes to higher trophic levels 2. What is the source for all energy in an ecosystem? • All energy in an ecosystem can be traced back to the sun

  36. Make an entry- Matter Cycles- 1/13/12 • Tape in picture • REMEMBER-

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