1. 5-3 Human Population Growth
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2. Patterns of Population Growth
The scientific study of human populations is called demography.
Demography examines the distributions and characteristics of human populations and attempts to explain how those populations will change over time( called population dynamics).
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Historical Overview
How has the size of the human population changed over time?
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What is the carrying capacity for the human population?
Are there limiting factors for the human population?
If so are the Limiting factors Density dependent or independent?
Read pg and think about what the author means by “Earth as an Island”. Then answer this: How might this analogy relate to a “closed system” like the bacteria in the bottle?
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Historical Overview
Historical Overview
Like the populations of many other living organisms, the size of the human population tends to increase with time.
For most of human existence, the population grew slowly.
Limiting factors kept population sizes low.
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Historical Overview
About 500 years ago, the human population began growing more rapidly.
Life was made easier, safer, and healthier by advances in agriculture, industry, and medicine.
What are advances in agriculture called?_____________________
Death rates were dramatically reduced, while birthrates remained high.
This was anti the Thomas Malthus prediction . What was his prediction?
__________________________
Green revolution
Populations would outstrip food supply
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8. Human Population Growth
Historical Overview
Human Population Growth
Most important medical advancement in 1928  ?
The size of the human population has increased over time. After a long, slow start, the worldwide population grew exponentially following improvements in medicine, sanitation, agriculture, energy use, and technology.
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Who discovered penicillin and when?
Alexander Fleming--1928!
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10. Patterns of Population Growth
What is our current world population?
What is our current world growth rate?
Why do population growth rates differ in countries throughout the world?
Patterns of Population Growth
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What is the issue of each of the following countries in the world?
United States Bolivia
Brazil India
Ethiopia Nepal
Philippines
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ARE THERE ANY POSITIVES IN THE HUMAN POPULATION ISSUE?
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SOME NATIONS HAVE ACHIEVED ZPG . THEY COMPLETED THE DEMOGRAPHIC TRANSITION
WE HAVE ALWAYS SHOWN THAT MORE PEOPLE MEANS MORE MINDS TO SOLVE THE WORLD’S PROBLEMS
THE ENTIRE WORLD POPULATION WILL FIT IN TEXAS
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14. human carrying capacity? overuse of resources & pollution? crime?
arable land?
human carrying capacity?
overuse of resources & pollution?
crime?
triage?
legal abortion ...
religion?
govt. intervention?
immigration?
gender homicide?
age distribution?
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15. Patterns of Population Growth
Birthrates, death rates, and the age structure of a population help predict why some countries have high growth rates while other countries grow more slowly.
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16. Patterns of Population Growth
Over the past century, population growth in the United States, Japan, and much of Europe has slowed dramatically.
According to demographers, these countries have completed the “demographic transition”, a dramatic change in birth and death rates.
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17. Patterns of Population Growth
The demographic transition has three stages.
In stage 1, there are high death rates and high birthrates.
In stage 2, the death rate drops, while the birthrate remains high. The population increases rapidly.
In stage 3, the birthrate decreases, causing population growth to slow.
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18. Patterns of Population Growth
The demographic transition is complete when the birthrate falls to meet the death rate, and population growth stops.
Birthrates, death rates, and the age structure of a population help predict the rate of population growth. Birthrates and death rates fall during the demographic transition. In Stage I, both the birthrate and death rate are high. During Stage II, the death rate drops while the birthrate remains high. Finally, in Stage III, the birthrate also decreases.
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19. Patterns of Population Growth
Age Structure
Population growth depends, in part, on how many people of different ages make up a given population.
Demographers can predict future growth using models called age-structure diagrams.
Age-structure diagrams show the population of a country broken down by gender and age group.
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20. Patterns of Population Growth
U.S. Population
In the United States, there are nearly equal numbers of people in each age group.
This age structure diagram predicts a slow but steady growth rate for the near future.
80+
Males
Females
60–64
Age (years)
40–44
This graph shows the age structure of the U.S. population.
20–24
0–4
Percentage of Population
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21. Patterns of Population Growth
Rwandan Population
In Rwanda, there are many more young children than teenagers, and many more teenagers than adults.
This age structure diagram predicts a population that will double in about 30 years.
80+
Males
Females
60–64
Age (years)
40–44
This graph shows the age structure of the Rwandan population.
20–24
0–4
Percentage of Population
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22. Future Population Growth
To predict human population growth, demographers must consider the age structure of each country, as well as the prevalence of life-threatening diseases.
If growing countries move toward the demographic transition, growth rate may level off or decrease.
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23. Future Population Growth
This table, based on actual and projected data from the U.S. Census Bureau, International Database, shows data on world population.
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24. Future Population Growth
Ecologists suggest that if growth does not slow down, there could be serious damage to the environment and global economy.
Economists assert that science, technology, and changes in society may control the negative impact of population growth.
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5-3
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5-3
Which of the following is NOT a potential limiting factor of human population growth?
famine
medicine
war
disease
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5-3
The size of the human population began to increase exponentially directly after the
bubonic plague.
development of plowing and irrigation.
Industrial Revolution.
development of the first cities.
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5-3
The 2 main reasons why the population increased at this time was due to
Decreased birth rate & immigration
The green revolution and medical advancements
Demographic transition & sanitation
development of cities and technology
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5-3
The population growth that best represent the U.S. population to current times is
a. arithmetic
b. exponential
c.implosion
d.logistic
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5-3
The word sustainable means
Able to provide help through triage.
To improve and obtain logisitic growth.
To maintain zero population growth.
Able to continue a practice indefinitely
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5-3
What was the most important medical advancement in the early 1900’s and who discovered it?
. sanitation, T. Malthus
antibiotics, T.Malthus
vaccines, A. Fleming
penicillin, A. Fleming
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5-3
According to the “People bomb” video , which of the following nations has gender homicide as a population concern?
Brazil
India.
Philippines.
Ethiopia
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5-3
According to the “People bomb” video , which of the following nations has the population concern of overuse of natural resources and pollution?
Nepal.
Ethiopia.
United States.
Brazil.
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5-3
Which law has to do with stopping the trade of endangered species?
Endangered Species Act
Endangered Species Preservation Act
CITES.
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5-3
Which statistic is not accurate regarding endangered species?
Deforestation of the rainforest is occurring at the rate of 1 to 2 football fields/second.
99% of all the species that ever existed are extinct.
The natural rate of extinction is 1 species a day. The man-accelerated rate is 137species /day.
The number one reason that most species become extinct is due to pollution
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5-3
Which of the following has not witnessed a decline in population size due to biological magnification?
Spotted owl.
Bald eagle.
California condor
Passenger pigeon
Both a and d
All of the above were effected by biological magnification
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5-3
Which of the following populations was NOT affected by a pollution source directly or indirectly?
Many frog species.
Florida manatee.
Miss Waldron’s Red Colubus
quetzel
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5-3
Which is not an anthropocentric reason to save endangered species?
Use in medicine.
Promote ecological biodiversity.
Cosmetics
Part of the human food chain
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5-3
After the demographic transition is complete, a population
grows rapidly.
Fluctuates up & down.
begins a period of rapid decline.
Grows very slowly or stays about the same size as time passes.
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5-3
The most important part of the age-structure diagram to examine in determining a populations momentum or growth is the
location and age group.
age group and gender.
birthrate and death rate.
The balance or imbalance in the younger and older age groups.
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5-3
Since the mid-1960s, the average annual growth rate of the human population has
remained about the same.
failed to show a consistent pattern.
increased.
decreased.
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5-3
Which population has most likely made the demographic transition and what is their likely growth rate? .
0 to 0. 5% (or ZPG).
1.5%
2.0%.
2.8%.
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5-3
The current world population growth rate is apx.
0.6%.
1.09%.
1.7%.
2.8%.
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5-3
The current world population is apx .
6million
6 billion.
7 billion.
313 million.
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5-3
What is an accurate statistic on the amount of abortions performed in this country?
1 out of every 3 births
1out of every 8000 births
1.2 million /year.
61 million since it was made legal.
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5-3
. What is a true major concern with a population that has completed the demographic transition?
Social security system
support of a fairly large population over 100 years of age.
immigration.
Losing a war due to not enough youth to fight it.
All 4 answers are true!
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