Population Change

Population Change

1. Natural Change

   • Birth Rate - Death Rate
   • tells you by how many the population will be growing per thousand of population per year
   • For the population to increase births must exceed deaths
   • If deaths exceed births then the population will see a natural decrease

2. Demographic Transition Model

   • Stage 1
     • High Fluctuation
       • High birth and death rates
         • No birth control or family planning
         • Children needed to work
         • Disease and famine everpresent
       • Low total population
     • Example: Bangladesh Rainforest Tribes
   • Stage 2
     • Early Expanding
       • Birth rate exceeds death rates
         • Improvements of medical care and vaccines
       • Population grows rapidly
         • Decrease in child mortality
     • Example: Peru
   • Stage 3
     • Late Expanding
       • Birth rates fall rapidly but still are above death rates
         • Increased family planning
       • Slowly increasing population
         • increased industrialisation
     • Example: China
   • Stage 5
     • Decline
       • Total population decreasing
       • Death rates are above birth
         • Birth rates fall below replacement level
     • Example: Germany
   • Stage 4
     • Low Fluctuating
       • High Total Population
       • Vital rates remain low
     • Example: USA