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HOW POPULATIONS GROW

HOW POPULATIONS GROW. Population Clock. http://www.poodwaddle.com/clocks/worldclock/. The Water Lily Story.

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HOW POPULATIONS GROW

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  1. HOW POPULATIONS GROW

  2. Population Clock http://www.poodwaddle.com/clocks/worldclock/

  3. The Water Lily Story The Anchor Bay High School pond has one water lily leaf floating on the surface. The lily population will double in size every day if left unchecked. The water lilies will smother the pond in 30 days, effectively killing all other living things in the water. At what point should you concern yourself with cutting back the lily plants? When the pond is 1/8th covered, one-fourth covered, or one-half covered?

  4. Lily Pond – Day 1 . . Lily Count: 1

  5. Lily Pond – Day 2 . . Lily Count: 2

  6. Lily Pond – Day 3 . . Lily Count: 4

  7. Lily Pond – Day 4 . . Lily Count: 8

  8. Lily Pond – Day 5 . . Lily Count: 16

  9. Lily Pond – Day 6 . . Lily Count: 32

  10. Lily Pond – Day 7 . . Lily Count: 64

  11. Lily Pond – Day 8 . . Lily Count: 128

  12. Lily Pond – Day 9 . . Lily Count: 256

  13. Lily Pond – Day 10 . . Lily Count: 512

  14. Lily Pond – Day 11 . . Lily Count: 1,024

  15. Lily Pond – Day 12 . . Lily Count: 2,048

  16. Lily Pond – Day 13 . . Lily Count: 4,096

  17. Lily Pond – Day 14 . . Lily Count: 8,192

  18. Lily Pond – Day 15 . . Lily Count: 16,384

  19. Lily Pond – Day 16 . . Lily Count: 32,768

  20. Lily Pond – Day 17 . . Lily Count: 65,536

  21. Lily Pond – Day 18 . . Lily Count: 131,072

  22. Lily Pond – Day 19 . Lily Count: 262,144 .05 % covered

  23. Lily Pond – Day 20 Lily Count: 524,288 .10 % covered

  24. Lily Pond – Day 21 Lily Count: 1,048,576 .20 % covered

  25. Lily Pond – Day 22 Lily Count: 2,097,152 .39 % covered

  26. Lily Pond – Day 23 Lily Count: 4,194,304 .78 % covered

  27. Lily Pond – Day 24 Lily Count: 8,388,608 1.56 % covered

  28. Lily Pond – Day 25 Lily Count: 16,777,216 3.13 % covered

  29. Lily Pond – Day 26 Pond is 1/16th covered Lily Count: 33,554,432

  30. Lily Pond – Day 27 Lily Count: 67,108,864 Pond is 1/8th covered

  31. Lily Pond – Day 28 Lily Count: 134,217,728 Pond is 1/4th covered

  32. Lily Pond – Day 29 Lily Count: 268,435,456 Pond is 1/2 covered

  33. Lily Pond – Day 30 Pond is completely covered Lily Count: 536,870,912

  34. Characteristics of Populations • Area inhabited by a population • The # of individuals per unit area • Rate at which a population changes size • Different ages of the organisms in a population • Geographic Distribution • Density • Growth rate • Age structure

  35. Population Density • The number of individuals per unit area

  36. Population Density Cactus: small #’s Low density Shrubs: higher #’s High density

  37. Birth Rate Death Rate Immigration Emigration the amount of births the amount of deaths moving into an area moving out of an area Population GrowthFactors that affect population size:

  38.  birth rate &  death rate  birth rate &  death rate  immigrants &  emigrants  immigrants &  emigrants Decrease Increase Decrease Increase How is the Population Affected?Increase or Decrease

  39. Exponential Growth • Will occur under IDEAL conditions • unlimited resources • no predators • no disease • plenty of space • Produces a J – shaped Curve

  40. Logistic CurveS- Curve • In ecosystems: • Resources are limited • Predators • Disease • The growth of populations slows or stops (actually averages out to a steady size) • Birth rate = death rate • Immigration = emigration • Leveled-off population reached its carrying capacity

  41. Carrying Capacity • The largest number of organisms that a given ecosystem can support

  42. Logistic CurveS-Curve

  43. Waynes world 2 clip

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