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Populations of Organisms

Populations of Organisms. 1. Population Density. Number of individuals per unit area, i.e., per square mile. 2. What is the population density of plants in our greenhouses per square foot. Area of greenhouse: 25 X 125 10,000 plants per greenhouse. 25 X 125 = 3125 square feet.

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Populations of Organisms

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  1. Populations of Organisms

  2. 1. Population Density Number of individuals per unit area, i.e., per square mile.

  3. 2. What is the population density of plants in our greenhouses per square foot. Area of greenhouse: 25 X 12510,000 plants per greenhouse 25 X 125 = 3125 square feet 10,000/3125 = 3.2 plants per square foot

  4. 3. What are the 3 factors that affect population size? Number of births Number of deaths Number of individuals that enter or leave a population

  5. 4. Immigration Movement of individuals into an area.

  6. 5. Emigration Movement of individuals out of an area.

  7. 6. Exponential Growth Population grows at a constant rate.

  8. 7. One aphid can develop into 300,000 aphids in 30 days in our greenhouses. Draw an exponential growth curve that shows this growth.

  9. 300,000 Aphids 1 Day 1 Day 30

  10. 8. Logistic Growth When a population’s growth stops or slows down following a period of exponential growth.

  11. 9. Carrying Capacity The largest number of individuals an area can support.

  12. Would the aphid population in the greenhouse eventually reach the S-shapedcurve shown on page 122? YES

  13. 11. What would cause the aphid population to reach the S-shaped curve growth level? Lack of food supply, plants would be consumed Lack of space Disease

  14. 12. Make a graph showing the fruit fly population growth shown on page 123. Fruit Fly Population Time

  15. 13. What type of growth pattern is shown by the fruit fly graph? Logistic S-curve

  16. 14. At what population level does the fruit fly reach carrying capacity? 320

  17. Population Density Upon inspecting Bob’s potato farm it is discovered that thereare 5 Colorado Potato Beetles in 1 square foot of area. What is the population density of Colorado Potato Beetles on Bob’s farm per acre? _______________________ (One acre = 43,560 square feet) The damage threshold for Colorado Potato Beetles is 2-3 per sqaure foot. Do you think Bob has a problem? ________________ 5 X 43,560 = 217,800 YES he does

  18. Population Density Suzy has a greenhouse that measures 20 X 50 feet with 5,000 aphids (estimate). The damage threshold for aphids is 4 per square foot. What is the population density for aphids per square foot in Suzy’s greenhouse? Does Suzy have an aphid problem? ______________ 20 X 50 = 1,000 square feet 5,000/1,000 = 5 aphids per square foot YES

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