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Happy Tuesday!! Feb. 7 th

Happy Tuesday!! Feb. 7 th. Think back…what’s a population? Draw one on your page.  QUIZ today—study quietly until the bell!. Chapter 19: Populations. 19-1: Understanding Populations. How big is the HUMAN pop?. 6.3 BILLION in 2003 Tripled since 1900!! World Population Clock.

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Happy Tuesday!! Feb. 7 th

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  1. Happy Tuesday!! Feb. 7th • Think back…what’s a population? Draw one on your page.  • QUIZ today—study quietly until the bell!

  2. Chapter 19: Populations 19-1: Understanding Populations

  3. How big is the HUMAN pop? • 6.3 BILLION in 2003 • Tripled since 1900!! • World Population Clock

  4. What’s a population? • Same species • Live in same place @ same time • Examples?

  5. Studying Populations • Pop size: • # indiv in pop • Not always easy to measure! • Mobile vs immobile • Many vs few • Subsample, extrapolate

  6. Population Density • How crowded • # indiv/unit area or volume

  7. Depends on Dispersion! • Spatial distribution UNIFORMCLUMPEDRANDOM Draw: Why? Ex?

  8. Review • http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60336.htm

  9. How about these?

  10. Demography • Birth rate (natality) • US: ~4 million/yr • Death rate (mortality) • US: ~2.6 million/yr • Life expectancy • US: 74-80 yrs

  11. Which country has a higher % of young people? • Of elderly people? • Which may show rapid growth in the near future?

  12. Patterns of Mortality: Survivorship Curves • I: • II: • III: http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60340.htm

  13. p. 384

  14. Happy Monday! 9/19 • Give an example of an animal for each type of Survivorship Curve.

  15. Chapter 19: Populations 19-2: Measuring Populations

  16. Pop Growth Rate • Amount the pop size changes over time

  17. Depends on 4 processes: • Birth • Death • Immigration • Emigration

  18. Increasing or decreasing? • Growth rate is positive • Growth rate is negative

  19. http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60341.htmhttp://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60341.htm Two Pop Growth Models http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60343.htm • Logistic • Exponential Draw B, D? Limiting factors? Carrying capacity?

  20. Models to Predict

  21. As pop grows, what happens to density? • More competition, limited resources

  22. Pop. Size: Limiting Factors • Density-Dependent • Density-Independent Pop dens matter? Ex?

  23. Fluctuations are Natural

  24. Small Pops Have Problems • Endangered species • Siberian tiger, California condor, cheetah, sea turtles, panda • Natural disasters, disease; inbreeding • Bigger impact

  25. Concept Map online • http://my.hrw.com/sh2/sh07_10/student/flash/concept_maps/00174.htm

  26. p. 389

  27. Chapter 19: Populations 19-3: Human Population Growth

  28. Fast? Slow? Leveled off? • Bubonic Plague, 1340s/50s • Improved health conditions 1650s • Further improved after WWII in poorer countries • Type of growth curve? • Sustainable?

  29. p. 392

  30. Happy Tuesday! 9/20/2011 • Test Tomorrow…3-2-1! • List: • THREE things you’re confident about • TWO things you’re unsure about • ONE thing that you want to know but we didn’t discuss!

  31. Chapter 19 Review, p. 394

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