F igoten food web review

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F igoten food web review

  1. 1. Middle School ScienceMrs. Figoten
  2. 2. ALL LIVING THINGSNEED ENERGYIn an ecosystem, anorganism’s role depends on: How it obtains energy & How it interacts with the other living things in the ecosystemOrganism’s energy role is: Producer Consumer Decomposer
  3. 3. Introducing PRODUCERSIt all begins with plants thatmake their own food…..
  4. 4. CONSUMERS CAN BE…Herbivores eat plantsCarnivores eat animalsOmnivores eat plants and animalsScavengers eat dead animals
  5. 5. DECOMPOSERS ARENATURE’S RECYCLERSBACTERIAFUNGISOME SOIL ORGANISMS
  6. 6. “3rd level consumer” consumer “2nd level consumer” “1st level consumer”Food chains show the flow of energy through consumer levels
  7. 7. known
  8. 8. CONIFEROUS FOREST FOOD WEB
  9. 9. ECOSYSTEMS DEPEND ON THE BALANCE OF THEIR FOOD WEBSThe loss of one organism may tip thedelicate balance of survival for manyother organisms within that food web
  10. 10. POPULATION SURVIVAL Limiting Factors Prevent population from increasing Can happen if too many predators or not enough food -- changes in food web Carrying Capacity Largest population that environment can support Can happen from changes in food web Population graph goes up & then flattens
  11. 11. “Carrying Capacity” of Ecosystem (Most of one species ecosystem can hold) Rabbit Growth Curve 30 25 Population Size 20 15 Population 10 5 0 0 2 4 6 8 10 12 YearPopulation Graph goes up as species multiplies, then flattens when there is no more food to continue reproducing. Population of species can no longer grow.
  12. 12. Series ofPredictable Changes That Happen in aCommunity Over Time
  13. 13. Changes Over Time Where No Ecosystem Existed Before New Growth Begins withLichen & Mosses
  14. 14. Mature Bushes & Grasses & Lichen &Hardwood Small Trees Small Plants MossesTrees after after 20- after 5-15 first few150+ years 100 years years years
  15. 15. Changes OverTime After aDisturbanceSuch as aForest Firein anEcosystem
  16. 16. Mature HardwoodTrees after150+ years

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