1. Population Growth & Measurement
Mr. Anderson

2. Population All the members of one species that live in the same area.
Important Information about Populations
- Population Size
- Population Growth
- Population Density

3. Population Size Ways of measuring Population Size Direct Observation
Indirect Observation
Sampling
Mark-and-Recapture

4. Direct Observation Simply counting the organisms of a population.
Small Populations
Small Areas
Exact count

5. Indirect Observation
Using signs of an organism to estimate the population.
Used for hard to capture animals.
Exact count.

6. Sampling
Counting the number of organisms in a small area, to estimate how many are in a larger area.
Large Populations
Large Areas
Estimation

7. Mark and Recapture
Animals are safely captured, marked, and then later recaptured.
Best with easy to capture animals.
Estimation

8. Birth Rate vs. Death Rate
Birth Rate- the number of births in a population in a certain amount of time.
21 births per year
Death Rate- the number of deaths in a population in a certain amount of time.
37 deaths per year

9. Birth Rate > Death Rate = Population Increase

10. Death Rate > Birth Rate = Population Decrease

11. Population Density
The number of organisms in an area of specific size.