Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.



Published on

Published in: Education
  • Be the first to comment

  • Be the first to like this


  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>