Limits to population growth
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Limits to Population Growth. What slows the growth of populations?. Limiting Factors Density-dependent limiting factors : limiting factors that are dependent on population size

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Limits to Population Growth

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Limits to population growth

Limits to Population Growth


What slows the growth of populations

What slows the growth of populations?

  • Limiting Factors

  • Density-dependent limiting factors: limiting factors that are dependent on population size

  • Density-independent limiting factors: limiting factors that affect the same percentage of a population regardless of its size.


Density dependent limiting factors

Density-dependent limiting factors

  • Food supply

  • Predation

  • Disease

  • Related to competition and interactions between organisms.

  • Greater effect in larger populations.


Density dependent limiting factors1

Density-dependent limiting factors

  • Populations controlled by density-dependent factors show an S-shaped curve on a graph.

  • Exponential growth at first, then growth slows and stops at the carrying capacity. p.81


Density independent factors

Density-independent factors

  • Natural disasters

    • Hurricane

    • Fire

    • Tsunami

    • Limit growth of population by destroying habitat.


Density independent limiting factors

Density-independent limiting factors

  • Populations controlled by density-dependent factors show a boom and bust on a graph

  • Exponential growth when conditions are favorable, then many die when conditions change.

  • Thrips, aphids, and other

    Insects (pg 127)


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