Understanding Population Density and Factors Affecting Population Size
This guide explores the concept of population density, which measures the number of individuals in a specific area. It outlines various methods for determining population density, including direct observation, indirect observation, sampling, and the mark and recapture technique. Further, it discusses factors influencing changes in population size, such as birth, immigration, death, and emigration. Additionally, it addresses limiting factors like food, space, and weather, and concludes with the concept of carrying capacity, which defines the maximum population size that an environment can sustain.
Understanding Population Density and Factors Affecting Population Size
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Presentation Transcript
1. Notes: Studying Populations
2. A. Population Density The number of individuals in a certain area.
Population Density is equal to #of individuals divided by the area.
3. B. Ways to Determine Population Density
4. 1. Direct Observation Count all the members.
5. 2. Indirect Observation Use tracks or other signs to determine population size.
6. 3. Sampling Make an estimate from a sample area.
7. 4. Mark and Recapture Animals are first captured and marked and then released in the environment. Then another group is captured.
8. Change in Population Size
9. 1. Increase Size Birth adds new members.
Immigration - members moving into a population
10. 2. Decrease Size Death
Emmigration - animals leaving a population
11. D. Limiting Factors Factors that limit populations from increasing.
12. Food 2. Space 3. Weather
13. E. Carrying Capacity The largest population an environment can support.
