Population Dynamics Population Dynamics and and

HumansHumans

Population growth = (B+I)-(D+E)Population growth = (B+I)-(D+E) B=birthB=birth I=ImmigrationI=Immigration D=Death D=Death E=EmigrationE=Emigration

Crude population growth Crude population growth

The number /for every 1000The number /for every 1000

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

Current annual rates of population Current annual rates of population growth. growth.

1963 =2.2%1963 =2.2% 2004 =1.25%2004 =1.25%

This is good news but with 6 billion people in This is good news but with 6 billion people in the world humans are near or at the carrying the world humans are near or at the carrying capacity. capacity.

Developed and Developing Developed and Developing CountriesCountries

Developed countries have a .01%population Developed countries have a .01%population growth rategrowth rate

Developing countries have a 1.5% growth Developing countries have a 1.5% growth rate.rate.– Where do you think the greatest amounts of Where do you think the greatest amounts of

starvation occur?starvation occur?

Countries with the Most peopleCountries with the Most people

1. China =1.3 billion1. China =1.3 billion 2. India =1.1 billion2. India =1.1 billion 3. United States=300 million3. United States=300 million

Doubling time Doubling time

The amount of time it takes for a population The amount of time it takes for a population to double.to double.

Dt=70/rate of population growthDt=70/rate of population growth 70/2.2= 31 years70/2.2= 31 years How long would it take the world to reach 12How long would it take the world to reach 12 Billion how about 24 Billion how about 24

Survivorship Survivorship

When individuals in a population die.When individuals in a population die. GraphsGraphs R high infant mortality.R high infant mortality. K low infant mortality K low infant mortality

Population Age structuresPopulation Age structures

What countries have the oldest populations?What countries have the oldest populations?

Age structures.Age structures.

Graph of individuals at specific ages.Graph of individuals at specific ages.– 4types4types

Rapid growthRapid growth Slow growthSlow growth Zero Growth Zero Growth Negative growthNegative growth

Rapid growth Rapid growth

R strategy / African countriesR strategy / African countries Lots of children Lots of children High infant mortality High infant mortality Male Male Female Female

AgeAge

Slow Growth Slow Growth

Decreased infant mortality Decreased infant mortality Decreased birthsDecreased births High immagrationHigh immagration

Zero GrowthZero Growth

Steady births.Steady births.

Found in developed countries/Australlia or Found in developed countries/Australlia or FranceFrance

Negative poulation growthNegative poulation growth

Fewer births than at any age groupFewer births than at any age group Highly affluent societies. (Developed)Highly affluent societies. (Developed)