2. Effects of Environmental
Change on Ecosystems
Change can result from:
Population Changes
Physical Factors
Habitat Change
Human Impact or Influence
5. Geographic Distribution
• Geographic Distribution means the area that is
inhabited by an organism. This can very small or very large
depending on the organism.
Juniperus communis (sp)
distribution in
North America.
8. Population Growth
Population Growth is the net population growth.
Number of births compared to the number of deaths in
a population.
This can be expressed for geographic populations. Ex:
World human population, USA human
population, Wisconsin human population.
9. Population Growth
Go here to see the world population growth rate.
http://www.worldometers.info/world-population/
10. World Population Change
500 Years
This type of graph
Shows the exploding
human population.
Notice that this is an
Exponential Curve.
11. Population Growth
Populations will continue to growth unless there is a
factor influences the growth.
Physical changes in the environment can cause
population to do one of three things
1. Migrate: Change locations to one that is better suited
for survival
2. Adapt: Change to meet the physical environmental
change
3. Die: if the change is severe and wide spread a species
may become Extinct.