Population Dynamics and Humans

 Population growth = (B+I)-(D+E)  B=birth  I=Immigration  D=Death  E=Emigration 

Crude population growth  The number /for every 1000

 Annual rate of population change=  {Crude(B+I)-(D+E)}/1000persons*100%

Current annual rates of population growth.  1963 =2.2%  2004 =1.25%  This is good news but with 6 billion people in the world humans are near or at the carrying capacity.

Developed and Developing Countries  Developed countries have a.01%population growth rate  Developing countries have a 1.5% growth rate. –Where do you think the greatest amounts of starvation occur?

Countries with the Most people  1. China =1.3 billion  2. India =1.1 billion  3. United States=300 million

Doubling time  The amount of time it takes for a population to double.  Dt=70/rate of population growth  70/2.2= 31 years  How long would it take the world to reach 12  Billion how about 24

Survivorship  When individuals in a population die.  Graphs  R high infant mortality.  K low infant mortality

Population Age structures  What countries have the oldest populations?

Age structures.  Graph of individuals at specific ages. –4types  Rapid growth  Slow growth  Zero Growth  Negative growth

Rapid growth  R strategy / African countries  Lots of children  High infant mortality  Male Female  Age

Slow Growth  Decreased infant mortality  Decreased births  High immagration

Zero Growth Steady births. Found in developed countries/Australlia or France

Negative poulation growth  Fewer births than at any age group  Highly affluent societies. (Developed)