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F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
F igoten food web review
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F igoten food web review

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  • 1. Middle School ScienceMrs. Figoten
  • 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. Introducing PRODUCERSIt all begins with plants thatmake their own food…..
  • 4. CONSUMERS CAN BE…Herbivores eat plantsCarnivores eat animalsOmnivores eat plants and animalsScavengers eat dead animals
  • 5. DECOMPOSERS ARENATURE’S RECYCLERSBACTERIAFUNGISOME SOIL ORGANISMS
  • 6. “3rd level consumer” consumer “2nd level consumer” “1st level consumer”Food chains show the flow of energy through consumer levels
  • 7. known
  • 8. CONIFEROUS FOREST FOOD WEB
  • 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. 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. “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. Series ofPredictable Changes That Happen in aCommunity Over Time
  • 13. Changes Over Time Where No Ecosystem Existed Before New Growth Begins withLichen & Mosses
  • 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. Changes OverTime After aDisturbanceSuch as aForest Firein anEcosystem
  • 16. Mature HardwoodTrees after150+ years

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