B4 - Ecology in the local environment

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  • Created by: Naomi
  • Created on: 20-01-13 11:45
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  • Ecology in the local environment
    • A COMMUNITY is made up of all the organisms living there
    • Zonation is the gradual change in species distribution across a habitat
      • The distribution of species can be mapped using a transect line and displayed as a kite diagram
      • Changes in abiotic (non biological) factors cause zonation
    • A POPULATION is the number of a particular organism in a community
    • The distribution of species can be mapped using a transect line and displayed as a kite diagram
    • A POPULATION is the number of a particular organism in a community
      • A COMMUNITY is made up of all the organisms living there
      • Capture-recapture data can be used to calculate a population size estimate
        • Capture-recapture data assumes:
          • Identicle sampling methods
          • No deaths, immigration, emigration
          • Survival rates not affected by marking organisms
        • Bigger quadrat and more samples makes it a more accurate estimate
    • Capture-recapture data can be used to calculate a population size estimate
      • Capture-recapture data assumes:
        • Identicle sampling methods
        • No deaths, immigration, emigration
        • Survival rates not affected by marking organisms
      • Bigger quadrat and more samples makes it a more accurate estimate
    • Where an organism lives is called its HABITAT
    • Native ecosystems have a wider biodiversity than artificial ecosystems
    • Food chains and food webs show that plants and animals are interdependant, withs energy being transferred from one organism to another
      • Photosynthesis and respiration ensure an overall balance of gases
      • An ecosystem is self supporting in all factors apart from having to have the sun as an energy source

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