Chapter 4 Biology

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Population Biology

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Chapter 4 Biology

  1. 1. Chapter 4 Population Biology
  2. 2. How do Populations Grow??? <ul><li>Any population, when given unlimited amounts of resources will grow exponentially . </li></ul>
  3. 3. Types of Growth <ul><li>Logistics growth: Flattened S-shaped curve </li></ul><ul><li>Exponential Growth: J-shaped curve </li></ul><ul><li>Predator-Prey: Zig-Zag </li></ul>
  4. 4. Exponential Growth <ul><li>Begins slowly, then increases rapidly over a short amount of time. </li></ul>
  5. 5. Logistic Growth Curve <ul><li>Begins slowly, then grows exponentially for a time, then begins to level out. </li></ul><ul><li>Flattened S shape </li></ul>
  6. 6. What Keeps Populations under control??? <ul><li>Limiting Factors !! </li></ul><ul><li>2-Types </li></ul>
  7. 7. Density Dependent Limiting Factors <ul><li>Factors that have an increasing effect as the population increases. </li></ul><ul><li>Ex: Disease, parasites, predators, competition for food… </li></ul>
  8. 8. Density Independent Factors <ul><li>Factors that affect populations regardless of their density. (abiotic) </li></ul><ul><li>Ex: hurricanes, floods, drought, fire… </li></ul>
  9. 9. Predator-Prey Relationship Predators and their prey experience cycles in population growth.
  10. 10. Carrying Capacity <ul><li>The maximum number of individuals an area can sustain. </li></ul><ul><li>The blue dotted line represents the carrying capacity. </li></ul>
  11. 11. 2-Life History Patterns <ul><li>1. Rapid </li></ul><ul><li>2. Slow </li></ul>
  12. 12. Rapid Life History <ul><li>Small body size </li></ul><ul><li>Mature rapidly </li></ul><ul><li>Reproduce early </li></ul><ul><li>Short life spans </li></ul>
  13. 13. Slow Life History <ul><li>Large body size </li></ul><ul><li>Mature slowly </li></ul><ul><li>Reproduce slowly </li></ul><ul><li>Longer life spans </li></ul>
  14. 14. Section 4.1 Summary – pages 91-99 <ul><li>Three patterns of dispersal are random , clumped , and uniform . </li></ul>Density factors and population growth Random Clumped Uniform
  15. 15. Human Population Growth <ul><li>Demography : the study of human population size , density and distribution , movement , and its birth and death rates . </li></ul>
  16. 16. Human Population Growth…
  17. 17. Age Structure for Human Population Growth Population Distribution Per Age Range for Several Countries Stable growth Rapid growth Slow growth Population (percent of total for each country) Male Female Reproductive years Age

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