Human Population Growth

Brain Pop MovieAnd

Quiz!

Human Population TrendsHistorical Perspective

Limiting Factors Scarce Food Incurable Diseases

Only ½ the Children in the World Survived to Adulthood

Therefore families had many children to ensure some would survive.

History of Human Population Trends

Source: Glencoe, Biology, 2009

History of Human Population Trends cont’d

Source: Glencoe, Biology, 2009

Human Population Trends Human population

tends to increase with time.

500 years ago a shift to rapid growth.

Agriculture and Industry Reliable Food Supply Shipping Improved Sanitation Healthcare

All decreasing the death rate and increasing life expectancy.

Source: Glencoe, Biology, 2009.

Increase in Human Population Growth Over Time

(Prentice Hall, Biology, 2003)

Source: Glencoe, Biology, 2009.

Patterns of Population Growth Demography

Scientific study of human population growth.

What factors do scientists need to take into consideration to predict population growth? Birthrates Death Rates Age Structure

Demographic Transition

Dramatic change in birth and death rates

As countries become developed there is a shift in birth rate and death rate

What is happening in the graph?

Demographic Transition Cont. Transition is complete when the

birthrate falls to meet the death rate. Zero Population Growth

What countries have undergone demographic transition? US Europe Japan

Population Growth Rates of Countries

Source: Glencoe, Biology, 2009.

Predicting Population Growth

Age-structure diagrams Graphs numbers of people in different

age groups in the population

How could this help Biologists predict population growth?

Interpreting Age-Structure Diagrams

Pre-Reproductive, Reproductive, and Post-Reproductive Classifications

Source: Glencoe, Biology, 2009.

Developed Vs. Underdeveloped Country

What are the characteristics of each country? Developed

Underdeveloped

Human Carrying Capacity Estimated to be around 8-

10 billion people

Threat of disease and starvation once reached

Technology has temporarily increased human carrying capacity

FOOD FOR THOUGHT ACTIVITY

Source: Glencoe, Biology, 2009

Graphic Sources http://www.coremedicalgroup.com/pix/

scrubs_lg.jpg http://nue.okstate.edu/Rockefeller/obregon.jpg http://www.eatonco.org/_derived/2L-

sanitation.htm_cmp_sanitation010_bnr.gif http://www.geography.learnontheinternet.co.uk/

images/popn/demographictransition.gif http://www.census.gov/cgi-bin/ipc/idbsum.pl?

cty=CF http://www.census.gov/cgi-bin/ipc/idbsum.pl?

cty=US