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How populations grow

How populations grow. 3 important characteristics of a population are -. How populations grow. 3 important characteristics of a population are – Geographic distribution -. How populations grow. 3 important characteristics of a population are –

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How populations grow

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  1. How populations grow • 3 important characteristics of a population are -

  2. How populations grow • 3 important characteristics of a population are – • Geographic distribution -

  3. How populations grow • 3 important characteristics of a population are – • Geographic distribution – describes the area inhabited by a population

  4. How populations grow • 3 important characteristics of a population are – • Population density -

  5. How populations grow • 3 important characteristics of a population are – • Population density – number of individuals per unit area

  6. How populations grow • 3 important characteristics of a population are – • Population density – number of individuals per unit area • Example of low density -

  7. How populations grow • 3 important characteristics of a population are – • Population density – number of individuals per unit area • Example of low density – • Example of high density -

  8. How populations grow • 3 important characteristics of a population are – • Growth rate -

  9. How populations grow • 3 important characteristics of a population are – • Growth rate – the speed at which a population may change in numbers

  10. How populations grow • Three factors that can affect population size

  11. How populations grow • Three factors that can affect population size • The number of births

  12. How populations grow • Three factors that can affect population size • The number of births • The number of deaths

  13. How populations grow • Three factors that can affect population size • The number of births • The number of deaths • The number of individuals that enter or leave a population

  14. How populations grow • Immigration -

  15. How populations grow • Immigration – the movement of individuals into an area

  16. How populations grow • Immigration – the movement of individuals into an area • Example -

  17. How populations grow • Immigration – the movement of individuals into an area • Example – animals in search of mates or food arrive from outside the population

  18. How populations grow • Emigration -

  19. How populations grow • Emigration – the movement of individuals out of a population

  20. How populations grow • Emigration – the movement of individuals out of a population • Example -

  21. How populations grow • Emigration – the movement of individuals out of a population • Example – young animals approach maturity and leave area to establish new territories

  22. How populations grow • Exponential growth -

  23. How populations grow • Exponential growth – occurs when the individuals in a population reproduce at a constant rate

  24. Exponential growth • A graph of exponential growth would be

  25. Exponential growth • A graph of exponential growth would be J-shaped

  26. Exponential growth • A graph of exponential growth would be J-shaped • Example -

  27. Exponential growth • A graph of exponential growth would be J-shaped • Example - bacteria

  28. Exponential growth • A graph of exponential growth would be J-shaped • Example – bacteria • Usually occurs

  29. Exponential growth • A graph of exponential growth would be J-shaped • Example – bacteria • Usually occurs under ideal conditions with

  30. Exponential growth • A graph of exponential growth would be J-shaped • Example – bacteria • Usually occurs under ideal conditions with unlimited resources

  31. Exponential growth • Bacteria - some are able to reproduce every 20 minutes

  32. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria

  33. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2

  34. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be __

  35. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4

  36. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4 • Another 20 minutes there will be ___

  37. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4 • Another 20 minutes there will be 8 • In another hour there will be ___

  38. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4 • Another 20 minutes there will be 8 • In another hour there will be 64 • In 2 more hours there will be ___

  39. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4 • Another 20 minutes there will be 8 • In another hour there will be 64 • In 2 more hours there will be 512 • In just one day there will be ___

  40. Exponential growth • Bacteria - some are able to reproduce every 20 minutes • If you begin with one bacteria • 20 minutes later there will be 2 • Another 20 minutes there will be 4 • Another 20 minutes there will be 8 • In another hour there will be 64 • In 2 more hours there will be 512 • In just one day there will be 4,720,000,000,000,000,000,000

  41. How population grow • Logistic growth -

  42. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth

  43. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen?

  44. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen?

  45. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen? • Birthrate decreases

  46. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen? • Birthrate decreases • Deathrate increases

  47. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen? • Birthrate decreases • Deathrate increases • Or both events occur at same time

  48. How population grow • Logistic growth – occurs when a population’s growth slows or stops following a period of exponential growth • Why might this happen? • Birthrate decreases • Deathrate increases • Or both events occur at same time

  49. Logistic growth Number of yeast cells Time (hours)

  50. Logistic growth • Graph would be “S-shaped” Number of yeast cells Time (hours)

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