Population Growth andCarrying Capacity
Objectives• SWBAT explain population growth andcarrying capacity• SWBAT discuss the potential decline of humanbeings
Principles of Population Growth• Population is a group of organisms, all ofthe same species, that live in a specific areaa...
Linear Growth• If a population grew at a set amount eachyear, say by 10 organisms per year, then thepopulation has LINEAR ...
QuestionYour parents give you two options for allowance1. 1,000 a month2. A penny on the first day of the month thatdouble...
.01 .02 .04 .08 .16 .32.64 1.28 2.56 5.12 10.24 20.48 40.9681.92 163.84 327.68 655.36 1310.72 2621.44 5242.8810,485.76 209...
Exponential Growth• If you graph the allowance we just saw on thegraph it will look like this, its is calledEXPONENTIAL GR...
Exponential Growth• A population that is growing without any limits,would have exponential growth.• Meaning that as the po...
Exponential Growth
Carrying Capacity• The environment has a CARRYINGCAPACITY for each population…• Carrying capacity is the maximum numberof ...
Limiting Factors• Definition?Limiting factors are any biotic or abiotic factorthat causes population size to decrease andi...
Question• What are some examples of things that canlimit growth?
Question• What are some examples of things that canlimit growth?– Food, space, ability to reproduce, water,predators…
What can limit growth?• Limiting factors limit growth• Different sizes of populations will alsohave different factors affe...
Claim, Evidence, and Reasoning• Look at the next slide and make a claim abouthuman population.• Then use evidence to suppo...
Claim• Human beings have exceeded their carrycapacity on Earth and they will eventuallyreturn back to that capacity.
Evidence• What part of the graph supports your claim?
Reasoning• What will cause the human population to godown?
Reasoning• What will cause the human population to godown?– Disease– Starvation– Weather events (hurricanes, tornados, glo...
QUESTION: Interpreting Graphs and DataWhat happensduring the“transitionalstage”?a. Birth rates rise; death rates drop; pop...
QUESTION: Interpreting Graphs and DataWhat happensduring the“transitionalstage”?a. Birth rates rise; death rates drop; pop...
Exit Ticket• What is population growth?• Describe the difference between linear andexponential growth?• What is a carrying...
Centers• Bill Nye Center• Population Growth Center• BrainPOP
Populaiton growth and carrying capacity cer (no do now)
Populaiton growth and carrying capacity cer (no do now)
Populaiton growth and carrying capacity cer (no do now)
Populaiton growth and carrying capacity cer (no do now)
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Populaiton growth and carrying capacity cer (no do now)

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carrying capacity and population growth with claims, evidence and reasoning

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Populaiton growth and carrying capacity cer (no do now)

  1. 1. Population Growth andCarrying Capacity
  2. 2. Objectives• SWBAT explain population growth andcarrying capacity• SWBAT discuss the potential decline of humanbeings
  3. 3. Principles of Population Growth• Population is a group of organisms, all ofthe same species, that live in a specific areaat the same time.• Population growth is defined as an increasein size of a population over time…• However, populations grow at differentrates.
  4. 4. Linear Growth• If a population grew at a set amount eachyear, say by 10 organisms per year, then thepopulation has LINEAR GROWTH• However, populations normally do not havelinear growth. Linear growth looks like this(Please draw in your notes)
  5. 5. QuestionYour parents give you two options for allowance1. 1,000 a month2. A penny on the first day of the month thatdoubles to two pennies on the second dayand so on until the last dayof the monthWhich option do you choose?
  6. 6. .01 .02 .04 .08 .16 .32.64 1.28 2.56 5.12 10.24 20.48 40.9681.92 163.84 327.68 655.36 1310.72 2621.44 5242.8810,485.76 209711.52 41943.04 83886.08 167772.16 335544.32 671088.641342177.282684354.565368709.1210,737,418.24Over 10 million!!On 31 day months
  7. 7. Exponential Growth• If you graph the allowance we just saw on thegraph it will look like this, its is calledEXPONENTIAL GROWTH:• (Please draw in your notes)02000400060008000100001200014000160001 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
  8. 8. Exponential Growth• A population that is growing without any limits,would have exponential growth.• Meaning that as the population gets bigger, it alsowill grow faster• But, populations cannot keep exponential growthfor very long, because the environment wouldnot be able to support it.
  9. 9. Exponential Growth
  10. 10. Carrying Capacity• The environment has a CARRYINGCAPACITY for each population…• Carrying capacity is the maximum numberof organisms in a population supported byan ecosystem’s resources/limiting factors– Effected by factors such as the amount of:• Food, water, space, etc…– Can change when these factors change• EX: more food = higher carrying capacity!
  11. 11. Limiting Factors• Definition?Limiting factors are any biotic or abiotic factorthat causes population size to decrease andinfluences what can live where
  12. 12. Question• What are some examples of things that canlimit growth?
  13. 13. Question• What are some examples of things that canlimit growth?– Food, space, ability to reproduce, water,predators…
  14. 14. What can limit growth?• Limiting factors limit growth• Different sizes of populations will alsohave different factors affecting them.• When growth has been limited itsgraph will look like this:(please draw in your notes)02004006008001000120014001 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
  15. 15. Claim, Evidence, and Reasoning• Look at the next slide and make a claim abouthuman population.• Then use evidence to support your claim• Use reasoning to explain your claim.
  16. 16. Claim• Human beings have exceeded their carrycapacity on Earth and they will eventuallyreturn back to that capacity.
  17. 17. Evidence• What part of the graph supports your claim?
  18. 18. Reasoning• What will cause the human population to godown?
  19. 19. Reasoning• What will cause the human population to godown?– Disease– Starvation– Weather events (hurricanes, tornados, globalwarming)– War/Crime– Lack of fresh water– Pollution
  20. 20. QUESTION: Interpreting Graphs and DataWhat happensduring the“transitionalstage”?a. Birth rates rise; death rates drop; population increasesb. Birth rates drop; death rates drop; population decreasesc. Death rates drop; birth rates are stable; populationincreasesFigure 7.18
  21. 21. QUESTION: Interpreting Graphs and DataWhat happensduring the“transitionalstage”?a. Birth rates rise; death rates drop; population increasesb. Birth rates drop; death rates drop; population decreasesc.Birth rates are stable; death rates drop; populationincreasesFigure 7.18
  22. 22. Exit Ticket• What is population growth?• Describe the difference between linear andexponential growth?• What is a carrying capacity?• Name 3 reasons that the human populationmay decline?
  23. 23. Centers• Bill Nye Center• Population Growth Center• BrainPOP

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