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Populations

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Populations

  1. 1. Populations
  2. 2. Hierarchy Biome Ecosystem Community Population Organism
  3. 3. Competition <ul><li>Competition occurs when two or more organisms seek the same resource at the same time. </li></ul><ul><ul><li>This limits population size </li></ul></ul>
  4. 4. Population Size <ul><li>Why would an ecologist want to know about the size of something like a deer population? </li></ul><ul><li>Methods of Population Measurement: </li></ul><ul><ul><li>Trap-Mark-Release: they compare the number of tagged animals to the number of untagged animals to estimate the pop. size </li></ul></ul><ul><ul><li>Sample Counts: Estimate the population size of a large area by counting the number of an animal in a smaller area then multiplying. </li></ul></ul>
  5. 5. Sample Count
  6. 6. Human Population Density Map
  7. 7. Limiting Factors & Carrying Capacity <ul><li>Limiting Factor is anything that restricts the number of individuals in a populations. </li></ul><ul><ul><li>Less rain = less seeds = less food for seed eating mice. </li></ul></ul><ul><li>Carrying Capacity is the largest number of individuals of one species that an ecosystem can support </li></ul><ul><ul><li>Space, food, etc will limit carrying capacity </li></ul></ul><ul><ul><li>Have to move if they want to survive. </li></ul></ul>
  8. 8. Changes in Populations <ul><li>What effects changes in populations? </li></ul><ul><ul><li>Birth Rate </li></ul></ul><ul><ul><li>Death Rate </li></ul></ul><ul><ul><li>Moving </li></ul></ul><ul><ul><li>Migration </li></ul></ul>

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