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Population Growth Curves

Population Growth Curves. How and why populations change. How wolves change rivers. How many wolves were added to the ecosystem? What was the first change that happen in the ecosystem because of the wolves? How did the change in the producer population effect the ecosystem?

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Population Growth Curves

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  1. Population Growth Curves How and why populations change

  2. How wolves change rivers • How many wolves were added to the ecosystem? • What was the first change that happen in the ecosystem because of the wolves? • How did the change in the producer population effect the ecosystem? • What is the most shocking effect of the wolves being added to the ecosystem?

  3. Population size • 3 important characteristics of a population are its. • Geographic distribution • Density (how thick or thin they are) • Growth Rate

  4. Determining Population size Growth Shrink Increased death rates Emigration: moving out • Increased birth rates • Immigration: moving into

  5. Growth Curves • Exponential Growth (J- shaped) Curves • The population grows continuously. • There are NO limits of the population size. • Unlimited resources.

  6. Growth Curves • Logistic Growth (S-Shaped) Curve • The population can only grow so much • There are limits on the population • There is a limited amount of resources that the population can use. • Carrying Capacity (K) is the maximum organism that can survive in a specific ecosystem. The limit is reached.

  7. Limiting Factors • Density-Independent factors: • Anything Weather related • Volcanos • Earthquakes • Hurricanes • Tornados • Forrest fires • Drought • Floods • Humans

  8. Limiting Factors • Density-Dependent Factors • With in the population, population size • Space • Shelter • Competition • Disease • Parasitism

  9. Limiting Factors • These factors keep populations within a specific range. • They define the Carrying Capacity (K) on population size.

  10. Human Impact • Humans can have a positive and negative effect on populations • Hunting • Developments • Pollution • Zoos • Protected Lands • 5 Human Impacts on the Environment: Crash Course

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