Daily Trivia

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Daily Trivia

• Mexico City is sinking at a rate of 18 inches per
  year as a result of draining the water table for
  human consumption.

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Bellringer

• Write a paragraph depicting what life in the US
  might be like if the population doubled.

• Consider topics like
• Available recreation space
• Demands on resources
• Economic impact

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Agenda

• Daily Trivia
• Bellringer
• Population Notes
• Ecologist Groups
• Homework

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V. Population Ecology
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A. Population Growth

1. Population Density is the number of organisms in
   a given area.

• Immigration
• Moving Into a region
• Emmigration
• Exiting a region

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B. Exponential Growth

• Starts slow and rapidly progresses as more
  organisms are available to reproduce.

Exponential Growth
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C. Logistic Growth

• Carrying Capacity
• The largest number of individuals that an
  environment can support.

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D.Population Limits

1. As population increases it will eventually
   encounter the environments carrying capacity.
2. Limiting factors will prevent the population size
   from increasing.

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E. Density dependent factors

1. These factors have an increasing effect as the
   population increases.
2. Includes disease, competition, parasites, and
   food.

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F. Density Independent Factors

• These factors are not affected by the density of
  the population.
• Includes
• Temperature
• Storms
• Floods
• Drought
• Habitat disruption

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G. Other Factors

• Predation
• Competition
• Crowding and Stress
• Aggression
• Decreased parental care
• Decreased fertility
• Decreased resistance to disease.

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Homework

• Kaibab WS

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Human Ecology
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(No Transcript)
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Human Development

• Human impact on the environment has changes as
  technology has changed.
• Hunting gathering
• Agriculture
• Industry
• Urban development
• Notice that each is increasingly invasive!

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The Green Revolution

• Middle 20th century
• Superior breeds of plants developed
• Chemical fertilizers, pesticides, and herbicides
  used

• Worldwide food production has doubled!

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Going Green

• The next step in human ecology
• The new green represents a growing concern
  regarding human impact on the planet.

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Homework

• The Invaders Ecologist Article
• Review Packet (if not done)