1. Population Dynamics Dynamic=“changing”
Photo Credit: 

2. Geographic distribution – the area a pop lives(range)
How Populations Grow
Geographic distribution – the area a pop lives(range)

3. Population Density – the number of individuals in an area

4. Population Growth depends on:
Number of births
Immigration (in)
Number of deaths
Emigration (out)

5. In Springfield, 45 babies are born in the year 2008
In Springfield, 45 babies are born in the year people died that same year. What is the growth rate for the city?
Positive Growth rate = population increase Negative Growth rate = decrease

6. Exponential Growth –reproduce at a constant rate
Exponential Growth –reproduce at a constant rate. Occurs under ideal conditions (no limits)
J-shape curve
# of individuals
Time

7. Logistic Growth – resources become less available, growth slows or stops
S-shape curve
Carrying Capacity – the number an environment can support

8. 5-2 Limits to Growth
Limiting Factor – causes population growth to decrease
Density-Dependent Limiting Factors –depends on population size
Competition (for food and space)
predation
parasitism and disease

9. Density-Independent Limiting Factors – does not depend on population size
Unusual weather
Natural disasters
Human activities
= (pollution, habitat destruction, introduction of invasive species)