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Population growth curves. Population growth curves. Population is measured as: Births + immigration = deaths + emigration. Population growth curves. Population is measured as: Births + immigration = deaths + emigration

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Presentation Transcript
population growth curves1
Population growth curves
  • Population is measured as:
  • Births + immigration = deaths + emigration
population growth curves2
Population growth curves
  • Population is measured as:
  • Births + immigration = deaths + emigration
  • The number of a population present at any one time is a balance between its reproductive potential and the environmental resistance.
population growth curves3
Population growth curves
  • Population is measured as:
  • Births + immigration = deaths + emigration
  • The number of a population present at any one time is a balance between its reproductive potential and the environmental resistance.
  • For a given species, this is called the carrying capacity
population growth curves4
Population growth curves
  • Population is measured as:
  • Births + immigration = deaths + emigration
  • The number of a population present at any one time is a balance between its reproductive potential and the environmental resistance.
  • For a given species, this is called the carrying capacity
  • Eg = In one tank place two fish, in another place 25 fish. After a certain amount of time, both tanks will have the same amount of fish – why?
population growth curves5
Population growth curves
  • Population is measured as:
  • Births + immigration = deaths + emigration
  • The number of a population present at any one time is a balance between its reproductive potential and the environmental resistance.
  • For a given species, this is called the carrying capacity
  • Eg = In one tank place two fish, in another place 25 fish. After a certain amount of time, both tanks will have the same amount of fish – why?
  • Because one will have fish die, the other will breed
reproductive potential
Reproductive potential
  • Maximum ability of organisms to reproduce themselves under optimum conditions
reproductive potential1
Reproductive potential
  • Maximum ability of organisms to reproduce themselves under optimum conditions
  • The reproductive potential of all animals is extremely high
reproductive potential2
Reproductive potential
  • Maximum ability of organisms to reproduce themselves under optimum conditions
  • The reproductive potential of all animals is extremely high
  • Eg = Darwin predicted a single pair of elephants could leave over 19 million descendants in only 750 years! (If they all survived)
reproductive potential3
Reproductive potential
  • Maximum ability of organisms to reproduce themselves under optimum conditions
  • The reproductive potential of all animals is extremely high
  • Eg = Darwin predicted a single pair of elephants could leave over 19 million descendants in only 750 years! (If they all survived)
  • Open population – one where the organisms can immigrate and emigrate (come in and leave). Why would they leave?
reproductive potential4
Reproductive potential
  • Maximum ability of organisms to reproduce themselves under optimum conditions
  • The reproductive potential of all animals is extremely high
  • Eg = Darwin predicted a single pair of elephants could leave over 19 million descendants in only 750 years! (If they all survived)
  • Open population – one where the organisms can immigrate and emigrate (come in and leave). Why would they leave?
  • Closed population – one where organisms can’t move out. Eg - ?
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