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5 Ecosystem

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  • Photosynthesis Light energy to chemical energy (glucose) Waste = oxygen Glucose turned to starch Passed to animals Passed from animal to animal Each time released by respiration (ATP)
  • Clog waterways with runoff esp road works - lots of clay and silt Pollution Drought Over fish deforestation
  • Determine energy flow and chemical recycling in an ecosystem Producers (autotrophs) Primary consumers (herbavores) Secondary consumers (eat herbivores) Tertiary consumers ( eat secondary consumers ) Quaternary consumers ……….
  • DDT, heavy metal ions, pesticides
  • Transcript

    • 1. Ecosystems and Communities
    • 2. Ecosystem
      • All the communities plus the physical factors in the environment in a given area, and how they relate to each other
    • 3. Topics
      • Energy
      • Trophic levels
      • Food chains and webs
      • Chemical recycling
      • Management practices
    • 4. Energy Light energy Photosynthesis Glucose Starch Respiration Released as ATP
    • 5. ATP
      • Provides energy for all living processes
        • Mechanical (movement)
        • Chemical (new molecules or cells)
        • Active transport (absorb nutrients)
        • Electrical (for nerves)
        • Bioluminescence (e.g. glow worms)
      • One way energy flow
    • 6. Humans
      • Upset energy flow
        • Block out light
        • Remove food source
    • 7. Trophic Levels
    • 8. Energy Pyramids
      • 1% light used for photosynthesis
        • Light falling on a leaf is
          • Transmitted
          • Reflected
          • Absorbed
    • 9.  
    • 10.  
    • 11.  
    • 12. Food Chains and Webs
    • 13. Human Affects
      • Biological magnification
        • Chemicals and poisons become more concentrated in body tissues as you go higher up the pyramid
        • Top predators have the highest dose
    • 14.
      • Remove part of the food chain
        • Cut down forests
          • Remove producer
          • Remove prey - predator suffers
          • Remove predators - prey population “booms” then “busts”
    • 15.
      • Introduce exotic species
        • Rabbits eat grassland
        • Stoats and weasels introduced to eat rabbits - ate native birds instead
        • Deer (for sport) ate out beech forests
        • Possums eat out pohutakawa
        • German wasp competes with native birds (honey dew)
    • 16.
      • Removal of too much of an organism
        • Overfishing - not enough older fish to reproduce
        • Overfarming - don’t return nutrients to soil - create dust bowls covered in weeds

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