types of population growth, population density

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7 Terms

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Types of population growth

  1. growth with limits (bell-shaped curve)

  2. S-shaped curve (Logistic growth)

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Growth with limits

  • closed area with proper conditions, population will increase exponentially

  • then the conditions deplete and wastes build up, which becomes toxic

  • population will peak, then decline and die out

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S-shaped curve

  • nature is open, energy and nutrients are being put inside outside areas

  • population increases exponentially

  • then levels out but will have little fluctuations

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population density

a number of one kind of organism in an area

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population limiting factors

  1. density-dependant factors

  2. density-independent factors

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density-dependant factors

  • more dense the population, = greater the effect of those factors

    e.g. birth, death

    disease

    immigration

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Density-independent factors

  • not influenced by population density

    e.g. temperature

    rainfall

    natural disaster