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Human Population

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Human Population BIO 103 Human Ecology Dr. Phoebe Smith History of human evolution Homo habilis ~3 mya in Africa Use of simple, stone tools Homo erectus ~1 mya in ... – PowerPoint PPT presentation

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Title: Human Population


1
Human Population
  • BIO 103
  • Human Ecology
  • Dr. Phoebe Smith

2
History of human evolution
  • Homo habilis
  • 3 mya in Africa
  • Use of simple, stone tools
  • Homo erectus
  • 1 mya in Europe Asia
  • Homo sapiens
  • 1.3 mya in Africa
  • Out of Africa theory

3
Hunter-Gatherers
  • Consumed about 0.1 of biological production in
    the ecosystem

4
Agricultural Revolution
  • Ocurred 12,000 years ago in Middle East
  • Led to domestication of plants (crops) and
    animals
  • Increased percentage of biological production
    consumed
  • Increased carrying capacity

5
  • Largest populations in river valleys of India and
    China
  • 14th c.--plague reduces world population by 25
  • 16th c.--European colonialism and trade

6
Industrial Revolution
  • 18th c.
  • Agriculture wheat, corn, potatoes, sweet
    potatoes and rice
  • Technology increased production and carrying
    capacity
  • By the 19th c., large families (for labor) were
    no longer necessary

7
Green Revolution
  • 40 years ago
  • High-yield crop varieties (rice, wheat and corn)
  • What are the environmental effects of
    fertilizers, pesticides, etc.?

8
Current population growth rates
9
Population regulation
  • Are there cultural practices that limit
    population increase?
  • Territoriality
  • Polygamy
  • Infanticide
  • Breast-feeding

10
Consequences of population explosion
  • Quality of life
  • Lack of food
  • Environmental refugees migrate to cities from
    rural areas
  • Competition for resources
  • War in Iraq
  • May be controlled
  • Birth control
  • Education
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