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Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
Bio ch14 4 slide show
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Bio ch14 4 slide show

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  • 1. 14.4 Population and Growth Patterns Warm-Up 14.4 List 3 open-ended and 2 close-ended questions. Place an asterisk to the left of your most important one.
  • 2. 14.4 Population and Growth Patterns KEY CONCEPT Populations grow in predictable patterns.
  • 3. 14.4 Population and Growth Patterns Changes in a population’s size are determined by immigration, births, emigration, and deaths. • The size of a population is always changing. • Four factors affect the size of a population. – immigration – births – emigration – deaths
  • 4. 14.4 Population and Growth Patterns – Immigration: new members of a species coming into an area. – Births: newborns added to a population. – Emigration: members of a species leaving the area. – Deaths: members of a species that died.
  • 5. 14.4 Population and Growth Patterns Population growth is based on available resources. • Exponential growth is a rapid population increase due to an abundance of resources. (memorize the curve shape)
  • 6. 14.4 Population and Growth Patterns • Logistic growth is due to a population facing limited resources.
  • 7. 14.4 Population and Growth Patterns • Carrying capacity is the maximum number of individuals in a population that the environment can support. 1. List three things that would limit a population of coyotes living in the wild. 2. Is there a carrying capacity for humans?
  • 8. 14.4 Population and Growth Patterns • A population crash is a dramatic decline in the size of a population over a short period of time.
  • 9. 14.4 Population and Growth Patterns Ecological factors limit population growth. • A limiting factor is something that keeps the size of a population down. 3. List three limiting factors that would keep caribou populations down.
  • 10. 14.4 Population and Growth Patterns• Density-dependent limiting factors are affected by the number of individuals in a given area. – predation – competition – parasitism and disease
  • 11. 14.4 Population and Growth Patterns • Density-independent limiting factors limit a population’s growth regardless of the density. – unusual weather – natural disasters – human activities
  • 12. 14.4 Population and Growth Facts/Page HW: 14.5 Pgs. 445-447 5 Patterns• Study Guide 14.4 Stop whining1. Movement from one population into another one and get to is called ______. work!2. What are the four factors that affect a population size?3. How does the availability of resources affect population growth?4. Sketch the two different popn. growth curves. Write a brief description next to each one.5. What type of popn. growth curve shows a carrying capacity?6. List three examples of density dependent limiting factors.7. List three examples of density independent limiting factors.

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