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Ecology review2


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Ecology review2

  1. 1. Ecology Review
  2. 2. Ecosystems <ul><li>The environment and the organisms that live in it </li></ul><ul><li>Food chains/food webs show how the energy moves through an ecosystem </li></ul><ul><li>Food chains look at one direct line </li></ul><ul><li>Food web looks at all of the energy transferring in a whole ecosystem </li></ul>
  3. 3. Ogranisms…. <ul><li>In an ecosystem can be producers, consumers, or decomposers </li></ul><ul><li>Producers make their own food </li></ul><ul><li>Consumers do not; they eat both producers and consumers </li></ul><ul><li>Decomposers break down waste and decayed material from both producers and consumers </li></ul>
  4. 4. Producers…. <ul><li>Produce their own food </li></ul><ul><li>Producers are plants </li></ul><ul><li>Producers are eaten by consumers </li></ul><ul><li>Producers are the first organisms in the food chains (after the energy source) </li></ul>
  5. 5. Consumers… <ul><li>Can be herbivores ---- eat only plants (remember herbs are plants) </li></ul><ul><li>Can be carnivores ---- eat only meat </li></ul><ul><li>Can be omivores – eat both plants and meat </li></ul>
  6. 6. Decomposers….. <ul><li>Break down waster material and decaying organisms (organisms that have died) </li></ul>
  7. 7. Food chains…. <ul><li>Start with an energy source (usually the sun) </li></ul><ul><li>Then there is a producers </li></ul><ul><li>Producer is eaten by a consumer </li></ul><ul><ul><li>This is a PRIMARY CONSUMER </li></ul></ul><ul><li>The primary consumer is eaten by another consumer </li></ul><ul><ul><li>This consumer is a higher order/level consumer – the 2 nd one is a secondary consumer </li></ul></ul><ul><ul><li>And so on …. </li></ul></ul>
  8. 8. Food Chain Example First picture – sun ---- energy source & sunflowers ----producers Second picture – bird – primary consumer ---- bird eat the seeds from sunflowers Third picture – wolf – secondary consumer – wolves eat birds
  9. 9. Food webs <ul><li>Show all of the food chains in an ecosystem </li></ul><ul><li>Show how the energy is transferred </li></ul>
  10. 10. Food web example
  11. 11. Disturbances <ul><li>Disturbances in the environment can affect the overall food web </li></ul><ul><li>Go back to the food web…. </li></ul><ul><li>Take a look at the chain inside the food web of the grass and the ant </li></ul><ul><li>What organisms feed off the ant? </li></ul>
  12. 12. Disturbances….. <ul><li>Mice and spiders feed off the ants </li></ul><ul><li>What do you think would happen if the ant population was disturbed? </li></ul><ul><ul><li>The population can be disturbed by pesticides or other random events in the environment </li></ul></ul>
  13. 13. Disturbances <ul><li>So if the ant population went down </li></ul><ul><li>Then the mice and the spiders would have less to feed own which could cause them to starve and die </li></ul><ul><li>And the grass would not have something eating it as much so it would grow more and maybe out of control </li></ul>