Drastic Population Change

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Drastic Population Change

  1. 1. Launch <ul><li>In a food pyramid, where is the most energy available? </li></ul><ul><li>Where does the energy originally come from? </li></ul><ul><li>What form of energy does it come in? </li></ul><ul><li>Can a primary consumer use the energy in the form that it originally comes in? </li></ul><ul><li>What do we mean by “90% of energy is lost” between trophic levels? </li></ul>
  2. 2. Launch <ul><li>In a food pyramid, where is the most energy available? </li></ul><ul><ul><li>At the bottom </li></ul></ul><ul><li>Where does the energy originally come from? </li></ul><ul><ul><li>The sun </li></ul></ul><ul><li>What form of energy does it come in? </li></ul><ul><ul><li>Solar and Thermal energy </li></ul></ul>
  3. 3. Launch <ul><li>Can a primary consumer use the energy in the form that it originally comes in? </li></ul><ul><ul><li>No, primary consumers need chemical energy </li></ul></ul><ul><li>What do we mean by “90% of energy is lost” between trophic levels? </li></ul><ul><ul><li>According to law of conservation, energy cannot be lost. This statement means that the energy is no longer available in a form that is usable to consumers. It is changed back into thermal energy (heat) </li></ul></ul>
  4. 4. Clarifying Terms <ul><li>Solar energy = light </li></ul><ul><li>Thermal energy = heat </li></ul><ul><li>Chemical energy = sugars, starches, fats, etc. </li></ul>
  5. 5. Drastic Population Change
  6. 6. <ul><li>What happens when population size increases? </li></ul><ul><ul><li>More resources used up </li></ul></ul><ul><ul><li>but more food for predators </li></ul></ul><ul><li>What happens when population size decreases </li></ul><ul><ul><li>More resources, but less food for predators </li></ul></ul>
  7. 7. Predation
  8. 8. Predation <ul><li>the process by which one organism hunts and kills another organism for food. </li></ul>
  9. 9. <ul><li>Predator – Animal which hunts other animals for food </li></ul><ul><li>Prey- That which is or may be seized by animals or birds to be eaten </li></ul>
  10. 12. Food chains are simple
  11. 13. Food webs are complex
  12. 14. Corn Grasshopper Field Mouse Hawk
  13. 15. What happens when I increase the population size of corn? Corn Grasshopper Field Mouse Hawk
  14. 16. What happens when I decrease the population size of the mouse? Corn Grasshopper Field Mouse Hawk
  15. 17. <ul><li>Increasing or the decreasing the population size of the organism that is at the bottom is going to have the greatest effect on the ecosystem. </li></ul>
  16. 18. Get into your groups of 3 or 4
  17. 19. If I wanted to seriously hurt an ecosystem, decreasing the number of what organism would have the greatest effect on this food web?
  18. 20. If I wanted to reduce the number of frogs in a population but did not want to drastically affect the Kookaburra, what organism would I remove?
  19. 21. A drought would affect what organisms? Corn Grasshopper Field Mouse Hawk
  20. 22. A grasshopper parasite would affect what organisms? Corn Grasshopper Field Mouse Hawk
  21. 23. Predator/Prey Game <ul><li>http://biology.about.com/library/weekly/blpop1q.htm </li></ul>

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