1. Populations Bell-Ringer
1. List the 3 criteria that must be met in order for a group of organisms to be considered a population?
2. Here is an example of a population. Create two of your own examples. A Pack of Gray Wolves in Yellowstone National Park.

2. 3 Population Keys Population Size: # of individuals in a population.
--Small Pop. size problems:
--More likely to become extinct
--More likely to inbreed

3. Population Keys (cont.)
Population Density: number of individuals that live in a given area
--Low density, small populations are less likely to reproduce.

4. Population Keys (cont.)
Dispersion: the arrangement of populations.
--Random—Pine trees mixed with hardwoods
--Even distribution—Birds on a wire or crops
--Clumped—Buffalo herds or cities

5. Exponential Curve P. 322 Rate of population growth stays the same
Result: steady population growth
P. 322

6. Logistic Growth:
P. 323
Exponential Growth is limited by carrying capacity.
Density Dependent Factors: food, water, shelter, etc.

7. Density Independent Factors
Weather, Climate, and Natural Disasters
(for example: summer mosquitoes, spring azaleas, forest fires, etc.)

8. Pop. Growth
R-Strategists: organisms that grow exponentially (Short life, Low parental care, Rapid growth).
K-Strategists: organisms that exist near carrying capacity (Long life, High parental care, Slow growth).

9. Organisms/Populations/Communities
Choose an external stimulus and describe how it will affect an organism, a population, and a community.