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Population growth curves

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 curves

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  1. Population growth curves

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

  3. 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.

  4. 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

  5. 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?

  6. 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

  7. Reproductive potential • Maximum ability of organisms to reproduce themselves under optimum conditions

  8. Reproductive potential • Maximum ability of organisms to reproduce themselves under optimum conditions • The reproductive potential of all animals is extremely high

  9. 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)

  10. 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?

  11. 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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