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Chapter 5

Chapter 5. Populations. Photo Credit: http://www.flickr.com/photos/solidether/1084349065/. 5-1 How Populations Grow. Geographic distribution – the area a pop lives(range). Population Density – the number of individuals in an area. Population Growth. Number of births Number of deaths

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Chapter 5

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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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