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Ecology review 3

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  • 1. Ecology Review The branch of Biology that describes relationships between organisms and the environments in which they live
  • 2. Ecological Classifications
    • Organism – individual plant or animal
    • Population – groups of similar organisms in a defined area
    • Community – All of the populations of organisms in a defined area
    • Ecosystem – All of the communities of living organisms plus the abiotic – rocks, water, soil,
  • 3.  
  • 4. Balance
    • Ecosystems are balanced when living organisms equal the available resources
    • Unbalanced ecosystems occur when a organism or organisms over-consume the available resources
    • If an ecosystem becomes unbalanced, an adaptation must occur to rebalance it
  • 5. Succession
    • Primary succession – occurs where living organisms have not lived before – rare in nature – ie lava flow
    • Secondary succession – an ecosystem is damaged or partly destroyed – remnants of the community still exist
  • 6. Habitat & Niche
    • A habitat is the environment where plants and animals live. A place
    • Niche is the function that an organism has in its ecosystem. A role
  • 7. Competitive Advantage
    • When one organism is better able to survive in a environment than another
    • Competitive exclusion: when two or more species cannot co-exist in an area with limited resource
  • 8. Range of tolerance
    • The ability of an organism to survive change in its environment
    • The greater the range of tolerance for an organism, the greater its ability to survive
    • Largely determined by its inherited ability to adapt to new environmental conditions

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