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Transcript

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