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Understanding Populations: Growth and Limits

Learn about population growth and limits, including geographic distribution, density, exponential and logistic growth, carrying capacity, and limiting factors. Explore how populations increase or decrease and the factors affecting them.

tobias-hatfield
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Understanding Populations: Growth and Limits

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  1. Chapter 5 Populations Photo Credit: http://www.flickr.com/photos/solidether/1084349065/

  2. 5-1 How Populations Grow Geographic distribution – the area a pop lives(range)

  3. Population Density – the number of individuals in an area

  4. Population Growth Number of births Number of deaths Emigration (out) & Immigration (in)

  5. In Springfield, 45 babies are born in the year 2008. 15 people died that same year. What is the growth rate for the city? Positive Growth rate = population increaseNegative Growth rate = decrease

  6. Exponential Growth –reproduce at a constant rate. Occurs under ideal conditions (no limits) J-shape curve

  7. Logistic Growth – resources become less available, growth slows or stops S-shape curve Carrying Capacity – the number an environment can support

  8. 5-2 Limits to Growth Limiting Factor – causes population growth to decrease What are some limiting factors? Density-Dependent Factors –depends on population size competition predation parasitism and disease

  9. Density-Independent Factors – does not depend on population size Unusual weather Natural disasters Some human activities

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