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# Population growth curves - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Population growth curves' - arnaud

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Presentation Transcript

### Population growth curves

• Population is measured as:

• Births + immigration = deaths + emigration

• 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 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 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 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

• Maximum ability of organisms to reproduce themselves under optimum conditions

• Maximum ability of organisms to reproduce themselves under optimum conditions

• The reproductive potential of all animals is extremely high

• 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)

• 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?

• 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 - ?