09 bio 05

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09 bio 05

  1. 1. Food Chains"Theres always a bigger fish." – Qui-Gon Jinn
  2. 2. Food ChainsA food chain is a diagram which shows how organismsare linked together by feeding relationships. seed  mouse  cat
  3. 3. Food ChainsA food chain is a diagram which shows how organismsare linked together by feeding relationships.
  4. 4. Food ChainsThey always begin with a producer.
  5. 5. Food ChainsThe arrows point in the direction of energy (food) flow.
  6. 6. Food ChainsOther AbioticComponents
  7. 7. Food ChainsWhen organisms die, they are eaten by scavengers(ex. vultures, crabs, hyenas).
  8. 8. Food ChainsThen they arebroken down bydecomposersand detritivores(bacteria andfungi).
  9. 9. Food ChainsOther AbioticComponents
  10. 10. Food Webs
  11. 11. Food Webs:- the connection of severalfood chains.- more realistic view ofenergy transfer.- show organisms as part ofan interlocking relationship.
  12. 12. Food Webs
  13. 13. FoodWebs
  14. 14. Trophic Levels
  15. 15. Trophic LevelsAre the feeding levels that describe the positions oforganisms along a food chain.
  16. 16. Trophic Levels
  17. 17. 1st tropic  2nd tropic  3rd tropic  4th tropic level level level levelProducer primary secondary tertiary consumer consumer consumer secondary
  18. 18. Think. Pair. Share.Name an organism that:- eats rabbits- is on trophic level 2- is an autotroph- is a top carnivore
  19. 19. Impacts on Food WebsWhat would happen if an organism in a food chainsuddenly has a drastic change in population?
  20. 20. Think. Pair. Share.What would happen if all of the mangroves in this ecosystem were cut down by humans? There would be no food for the fish or crabs to eat, so they would all die off. After the fish and crabs die, the seabirds and pied oyster catchers would also starve.
  21. 21. Think. Pair. Share.What would happen if a virus invaded this ecosystem and killed-off all of the seabirds?There would be no predators to eat the fish and the fish population would become very large. If there are too many fish in the ocean, they may out-compete the pied oyster catchers for crabs and drive them to starvation.

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