Science 9 - Limits on Population Growth

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Limits on Population growth
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Biotic Potential

• The maximum number of offspring an organism can
  produce with UNLIMITED resources (food, water,
  space, etc.)

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Low Biotic Potential
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High Biotic Potential
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Capacity for Survival

• Number of offspring that survive until they can
  themselves reproduce.
• Some animals may lay hundreds of eggs, but only a
  few will survive to become adults

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Capacity for Survival(click on the you tube icon)
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Procreation

• The number of times per year, that an animal can
  reproduce

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Reproductive Life

• How long animals can actually reproduce for
• Elephants reproduce from age 15 to 90
• Dogs from ages 2 to 7

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Carrying Capacity
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Carrying Capacity

• Populations will grow until an ecosystems
  natural limit called the carrying capacity.
• These natural limits are called RESOURCES

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Carrying Capacity
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Limiting Factors
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Limiting Factors

• These are any factors which prevent unlimited
  growth

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Abiotic Limiting Factors

• Non-living factors which control population
  growth.
• Examples temperature, rain, etc.

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Biotic Limiting Factors

• Living factors which control the growth of a
  population
• Examples amount of food, predators, disease, etc.

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Population Density

• The number of animals in a given area.

High Population Density
Low Population Density
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Density-Dependent Factors

• Limiting factors which are affected by the
  number of other animals.
• Example food available, breeding areas, etc.
• Higher density, makes its harder to survive
  because there is more competition

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Density-Independent Factors

• Limiting factors not affected by population
  number (population density)
• Population controlled by non-living events.

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Limits on Human Populations?(click on the you
tube icon)