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 Europe & Asia Homo sapiens ~1.3 mya in Africa ‘ Out of Africa’ theory. Hunter-Gatherers. - PowerPoint PPT PresentationTRANSCRIPT
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 Europe & Asia
• Homo sapiens– ~1.3 mya in Africa– ‘Out of Africa’ theory
Hunter-Gatherers
• Consumed about 0.1% of biological production in the ecosystem
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
• Largest populations in river valleys of India and China
• 14th c.--plague reduces world population by 25%
• 16th c.--European colonialism and trade
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
Green Revolution
• ~40 years ago
• High-yield crop varieties (rice, wheat and corn)
• What are the environmental effects of fertilizers, pesticides, etc.?
Current population growth rates
Population regulation
• Are there cultural practices that limit population increase?– Territoriality– Polygamy– Infanticide– Breast-feeding
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