1. Population Growth
An increase in the size of a population over time

2. Exponential Growth
As each organism increases, more organisms are able to reproduce
Therefore, the population increases

3. Growth Curve
Exponential growth is shown in a growth curve, named a J-shaped Curve

4. J-shaped Curve

5. Limits on the Environment
Populations cannot continue to grow exponentially, because of limiting factors
What are some limiting factors in an environment?
RAISE YOUR HAND

6. Limits on an Environment
Limiting factors (i.e. food availability, predation, temperature, natural disasters), allows populations to level off
This leveling off results in an S-shaped Curve

7. Limiting Factors
S-Shaped Curve

8. Carrying Capacity
The number of organisms of one species that an environment can support
Populations can fluctuate above or below their carrying capacity

10. Density-dependent factors
Density-independent Factors
affect all populations regardless of their density
Temperature, storms, floods, and drought
As population increases so do these factors
Disease, competition, parasites, and food

11. How are you going to remember this?
Density-dependent is dependent on the population increasing
Density-independent is independent of the population

12. Video Clips http://www.youtube.com/watch?v=43VoMesUd 2Q (TD)
GA&feature=related (VI)
9A (VOL)
Us (TW)
(RB)