1. Feb 16, 2011 Bring up your Invasive Species Analysis questions
1. What characteristic is used to define a biome?

2. Q: What are some characteristics of populations?
All populations share the following characteristics
Population density: how many organisms are in the area
Spatial distribution: aka dispersion, how is the population spaced out in the area

3. Spatial Distribution Patterns
Uniform (Spread Evenly)

4. Spatial Distribution Patterns
Clumped (random groups clumped together like herds)

5. Spatial Distribution Patterns
Random (unpredictable)
Often determined by availability of resources

6. Q: What are some characteristics of populations?
Population ranges: where the population can be found (no species can live everywhere!)

7. Q: What are some characteristics of populations?
Population Limiting Factors
Density Independent Factors
Limiting factor that doesn’t depend on how many members there are in the population
Usually abiotic (floods, drought, tornado, extreme heat, extreme cold, human activities, etc)

8. Q: What are some characteristics of populations?
Population Limiting Factors
Density Dependent factor
Limiting factor that depends on how many members there are in the population
Often biotic (disease, predation, competition, parasites, etc)

9. Q: What are some characteristics of populations?
Population Growth Rate
Tells us how fast the population grows
To be determined you must know:
Natality (birth rate)
Mortality (death rate)
These are helpful, but usually balance each other out.
Emigration (how many are moving away)
Immigration (how many are moving in)

10. Q: What are some characteristics of populations?
Different models of growth
Exponential
Slow at the beginning, then shoots up
J curve

11. Q: What are some characteristics of populations?
Logistic
Slow at beginning, shoots up, levels off
S curve
Levels when it reaches carrying capacity
Maximum the environment can hold based on resources
At carrying capacity, competition is at it’s greatest
Births approx = deaths

12. Brain Pop

13. Homework
Parts 3 – 5 of pkt