Energy transfer

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  • Created by: emma
  • Created on: 20-11-14 23:24
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  • Energy Transfer
    • Food chain
      • Transfer of energy along trophic levels
      • Producer- start food chain
        • autotrophic, build organic compounds from simple molecules, photosynthetic
      • Consumer- primary, secondary, tertiary
        • Heterotrophic, rely on external source of organic comounds
      • Usually only 4 trophic levels as energy is lost at each level so it wouldn't be efficent
      • Decomposers- Break down organic compounds in dead organisms
    • Food Web
      • Shows energy transfer in ecosystem
      • Still arranged in trophic levels
      • More complex and diverse web, more stable ecosystem
        • Change in one part of web won't greatly effect other parts
    • Energy loss
      • Sun to producer- only 1-3% sun energy trapped in photosynthesis
        • Some light reflected, some misses chlorophyll, some wrong wavelength, some absorbed by atmosphere
      • Producer to 1 consumer
        • Not all plant digestible, Not all plant eaten, some energy lost to respiration, some energy lost to excretion
      • 1 consumer to 2 consumer
        • Not all animal is eaten, not all animal digestible, some energy lost to respiration or excretion
      • NP= GP - R
        • NP- net productivity, energy stored as new biomass, available to next trophic level
        • GP- Gross productivity, energy which is converted to organic molecules
        • Respiratory losses
    • Pyramids
      • Energy
        • Energy utilized at each trophic level in area at specific time
          • Kjm-2 year-1
      • Number
        • No of each organism at each level
          • Can be inverted if one tree or lots of parasites, difficult to draw to scale
      • Biomas
        • Actual biomass of organisms at each level
          • Must be dry mass to be reliable (dead), seasons bring sudden increase in reproduction


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