1. Population Dynamics Dynamic=“changing”
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2. Geographic distribution or Range – the area a pop. lives

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 a heard of elk in North Santiam valley, 25 calves are born in the year adults died that same year. 5 elk joined from the South Santiam river. What is the growth rate for the herd?
Births - Deaths +/- Migration = Growth
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 near carrying capacity
S-shape curve
Carrying Capacity – the population size an environment can support

8. 5-2 Limits to Growth
Limiting Factor – causes population growth to decrease
Density-Dependent Limiting Factors –depends on population density
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)