Adaptations

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Adaptations Ecology

• Unit III--Biology

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How do populations Change?
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Growth Rate

• Affected by births and deaths, immigrations and
  emmigrations
• Simple calculation
• GR birth rate death rate
• GR means population is getting larger
• -GR means population is getting smaller

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Exponential Growth J shaped

• When a population has an abundant amount of
  resources and no predators.

Will this type of growth continue? Why?
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Carrying Capacity - K

• The maximum number of individuals a particular
  environment can support.
• Typically, there are limits to growth
• Ex

These are called limiting factors
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Logistic Growth is S- Shaped

• This model incorporates the effect of population
  density on the rate of increase.

Carrying capacity
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Density-dependent factors

• Ex

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Density-independent factors

• Ex