Population

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  • Population
    • Population and ecosystems
      • Ecosystem
        • Made up of all the ineracting biotic (Living) and abiotic (non living) features in a specific area.
        • Two major processes
          • The flow of energy through the system
          • The cycling of elements within the system
      • Population
        • Group on interbreeding organisms of one species in a habitat.
        • Boundaries are often difficult to define.
        • Populations of different species form a community
          • Community
            • Defined all the populations of different organisms living and interacting in a particular place a the same time.
      • Habitat
        • The place where a community live.
        • Each habitat-smaller units-sub units with their own micro climate- microhabitat
      • Ecological Niche
        • Describes how an organism fits into the environment.
        • Refers to where an organism lives and what it does their-no two species occupy the same niche.
    • Investigative populations
      • Types of sampling
        • Point sampling-Individual points on a map chosen
        • Line sampling
        • Quadrate sampling-Used to sample a square area.
          • Vary in size and shape.
          • Can be used to measure:
            • Species frequency
            • Density
            • % cover-scale of abundance
          • Point quadrate-
            • Gives a more objective assesment
              • Record each species that touches a pin
              • % cover is calculated by: Hits/pins X 100
      • Random Sampling
        • Minimizes personal bias
        • Takes a sample of a whole area
      • Systematic sampling
        • sample taken in a regular fashion across an area-good for bias
        • Need at least 20 samples
      • Transects
        • Along a line which systematic samples are taken
        • Used to investigate transitions
        • Often used with quadrates

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