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3-2 Energy Flow

3-2 Energy Flow. Objectives. Explain the nature of interactions between organisms in different symbiotic relationships. Explain how cooperative and competitive relationships help maintain balance within an ecosystem.

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3-2 Energy Flow

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  1. 3-2 Energy Flow

  2. Objectives • Explain the nature of interactions between organisms in different symbiotic relationships. • Explain how cooperative and competitive relationships help maintain balance within an ecosystem. • Identify and explain the limiting factors that may affect the carrying capacity of a population within an ecosystem. • Predict how the use and flow of energy will be altered due to changes in a food web. • Predict the impact a natural or human caused environmental event may have on the diversity of different species in an ecosystem.

  3. We’ll Be Talking About Energy Today… • Don’t get too excited, you know my stance on ENERGY DRINKS!

  4. Producers • What is the main energy source for life on Earth? • Autotrophs/Producers – use energy from environment to create compounds necessary for life. • Photosynthesis – use light energy from sun to create sugar and starches. • Chemosynthesis – use chemical energy to produce carbohydrates.

  5. Producers

  6. Consumers • Heterotrophs/Consumers – rely on other organisms for energy and food supply. We will learn about different types of consumers later!

  7. Feeding relationships • Energy flows in one directionfrom sun, to producers, to consumers. • Trophic Level – each step in food chain/web. • Only 10% of the possible energy gets passed to the next trophic level!!!!!!!!!

  8. Closure • Anything for the good of the cause? • We will be done if we can answer the following questions. • What is the difference between autotrophs and heterotrophs? • Can you give an example of an organism that is an autotroph? • What are the two methods in which autotrophs create energy? • What is a trophic level? • How much energy is passed from trophic level to trophic level?

  9. Objectives • Explain the nature of interactions between organisms in different symbiotic relationships. • Explain how cooperative and competitive relationships help maintain balance within an ecosystem. • Identify and explain the limiting factors that may affect the carrying capacity of a population within an ecosystem. • Predict how the use and flow of energy will be altered due to changes in a food web. • Predict the impact a natural or human caused environmental event may have on the diversity of different species in an ecosystem.

  10. Review • What is the difference between a producer and a consumer? • What is another “more scientific” term for producers? • What is another “more scientific” term for consumers? • What are the two processes a producer/autotroph can do? • On our Ecological Sampling Lab, using a red pen (marker or color pencil will work too) classify each organism as an autotroph/producer (A/P) or heterotroph/consumer (H/C).

  11. Types of Consumers • Herbivores – obtain energy (eat) from only plants. • Carnivores – eat onlyanimals. Table Contest!!! List as many herbivores as you can in one minute. Largest list receives a prize. Table Contest for Carnivores

  12. Types of Consumers • Omnivores – eat both plants an animals.

  13. Types of Consumers • Detritivores – eat plant and animal remains (dead matter).

  14. Types of Consumers • Decomposers – break down organic matter. Hyperlink

  15. Ecological/Energy Pyramids • Fill in the blank: Only about ___% of the energy available in one trophic level gets transferred to the organisms in the next trophic level. • Where does it go? Pg. 72

  16. Closure Quiz #1 Which of the following organisms is a herbivore? • Tiger • Venus Fly Trap • Caterpillar • Horse

  17. Closure Quiz #2 Which classification of consumers do most humans fall under? • Herbivores • Omnivores • Carnivores • Detritivores

  18. Closure Quiz #3 How are decomposers important to ecosystems? • Remove unwanted biotic matter. • Return nutrients to soil. • Keep soil clean and preserved. • Decomposers are not important and in fact the world would be better without them.

  19. Closure Quiz #4 Which of the following is NOT an abiotic factor in an ecosystem? • Humans • Temperature • A Pond • Soil Quality

  20. Closure Quiz #5 Which percentage of energy is passed from trophic level to trophic level in a food web/chain?

  21. Closure Quiz #6 On a scale of 1 to 10, how do you feel about your knowledge level of ecology at this point? 10 being, “Awesome, I could ace a test right now.” 1 being, “Holy crap.”

  22. Assignment • Chapter 3 & 4 Section Reviews • Pg. 73 1-5 • Pg. 97 1-5

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