Ecology review 3

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Ecology review 3

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

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