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6.5 day 2

Photo by Vickie Kelly, 2004. Greg Kelly, Hanford High School, Richland, Washington. 6.5 day 2. Logistic Growth. Columbian Ground Squirrel Glacier National Park, Montana. We have used the exponential growth equation to represent population growth.

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6.5 day 2

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  1. Photo by Vickie Kelly, 2004 Greg Kelly, Hanford High School, Richland, Washington 6.5 day 2 Logistic Growth Columbian Ground Squirrel Glacier National Park, Montana

  2. We have used the exponential growth equation to represent population growth. The exponential growth equation occurs when the rate of growth is proportional to the amount present. If we use P to represent the population, the differential equation becomes: The constant k is called the relative growth rate.

  3. The population growth model becomes: However, real-life populations do not increase forever. There is some limiting factor such as food, living space or waste disposal. There is a maximum population, or carrying capacity, M. A more realistic model is the logistic growth model where growth rate is proportional to both the amount present (P) and the carrying capacity that remains: (M-P)

  4. Logistics Differential Equation The equation then becomes: We can solve this differential equation to find the logistics growth model.

  5. Partial Fractions Logistics Differential Equation

  6. Logistics Differential Equation

  7. Logistics Differential Equation

  8. Logistics Growth Model

  9. Example: Logistic Growth Model Ten grizzly bears were introduced to a national park 10 years ago. There are 23 bears in the park at the present time. The park can support a maximum of 100 bears. Assuming a logistic growth model, when will the bear population reach 50? 75? 100?

  10. Ten grizzly bears were introduced to a national park 10 years ago. There are 23 bears in the park at the present time. The park can support a maximum of 100 bears. Assuming a logistic growth model, when will the bear population reach 50? 75? 100?

  11. At time zero, the population is 10.

  12. After 10 years, the population is 23.

  13. Bears Years We can graph this equation and use “trace” to find the solutions. y=50 at 22 years y=75 at 33 years y=100 at 75 years p

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