Population growth curves
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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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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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