Warm Up 10

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Warm Up 10

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• What is ecological succession?
• Does this picture show primary or secondary
  succession?
• What is an example of secondary succession?
• Pioneer species or Climax community?
• 4. Stable group of plants and animals
• 5. First species to populate an area

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5.1 How Populations Grow
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CA State Standard

• Students know how fluctuations in population size
  in an ecosystem are determined by the relative
  rates of birth, immigration, emigration, and
  death.

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3 Characteristics of Population

• Geographic distribution
• Density
• Growth rate

Exponential Growth Logistic Growth
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Geographic Distribution

• area inhabited by a population
• range can vary
• few cubic centimeters to square kilometers

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Population Density

• of individuals per unit area
• EX 15 squirrels at UCLA Campus

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Growth Rate

• Population can increase or decrease
• Caused by
• of births
• of deaths
• of individuals that enter or leave population
  (immigration emigration)

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Growth Rate

• Birthrate gt death rate increase
• Death rate gt birthrate decrease
• Immigration Emigration

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Exponential Growth

• When a population reproduces at a constant rate
• Unlimited resources
• Bacteria reproduce every 20 minutes!
• Thats 4,720,000,000,000,000,000,000 in one day!!
• Use J-Shape graph

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Logistic Growth

• Growth slows or stops following period of
  exponential growth
• Resource becomes limited
• S shape graph
• Eventually reach carrying capacity-
• largest of individuals population can hold

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• 1. When the birthrate of a population exceeds its
  death rate, the population
• A. decreases.
• B. increases.
• C. stays the same.
• increases then decreases.

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• 2. An S-shaped curve on a graph of population
  growth is characteristic of
• A. exponential growth.
• B. logistic growth.
• C. carrying capacity.
• D. delayed growth.

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3. What are the 2 ways population can decrease?

1. Immigration and emigration
2. Increased death rate and immigration
3. Decreased birthrate and emigration
4. Emigration and increased birthrate

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• 3. What is the largest number of individuals an
  environment can support called?
• A. Emigration
• B. Immigration
• C. Logistic Growth
• D. Carrying Capacity

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• of individuals in an unit area
• a. Geographic Distribution
• b. Population Density
• c. Growth Rate
• d. Distribution Range