1. Section 14-3 and 14-4 “Population”
Write everything that is underlined

2. Section 14.3 KEY CONCEPT: Each population has a density, a dispersion, and a reproductive strategy.

3. Populations
Population density is a measurement of the number of individuals living in a defined space.
Population dispersion refers to how a population is spread in an area.
There are three types of dispersion illustrated on the next slides:

4. a. clumped

5. b.uniform

6. c. random

7. Type I: low level of infant mortality and an older population
Survivorship curves:
Type I: low level of infant mortality and an older population
common to large mammals and humans
Type II: survivorship rate is equal at all stages of life
common to birds and reptiles
Type III: very high birth rate, very high infant mortality
common to invertebrates and plants

8. Section 14.4 KEY CONCEPT: Populations grow in predictable patterns.

9. The size of a population is always changing.
Population Growth
The size of a population is always changing.
Four factors affect the size of a population:
Births
Deaths
Immigration
(Moving into an area)
Emigration
(Moving out of an area)

10. Exponential growth is a rapid population increase due to an abundance (lots of) of resources.

11. Logistic growth is due to a population facing limited resources.

12. Carrying capacity is the maximum number of individuals in a population that the environment can support.
This is due to limited resources (food, shelter, space)

13. A population crash is a dramatic decline in the size of a population over a short period of time.

14. A limiting factor is something that keeps the size of a population down.
Limiting factors can depend on the density of individuals in the population or not.

15. Parasitism and disease
Density-dependent limiting factors are affected by the number of individuals in a given area.
Predation
Competition
Parasitism and disease

16. Density-independent limiting factors limit a population’s growth regardless of the density.
unusual weather
natural disasters
human activities