1. Populations

2. Population
All the individuals of one species that occupy a certain geographical area during a certain time.

3. Natality
the number of offspring born in one year.

4. Mortality
the number of individuals that die in one year.

5. Immigration
movement into an area.

6. Emigration
movement out of an area.

7. Carrying Capacity
Is the maximum number of organisms the resources of an ecosystem can support.

8. Four factors help to determine the carrying capacity of a population
Materials and Energy
Food Chains
Competition
Density

9. Materials and Energy
limits on the useable energy from the Sun, supply of water, carbon and other essential materials.

10. Food Chains
their food supply and their predators limit populations.

11. Competition
all organisms need the same thing from their environment as the rest of the members of its species do.
This demand for resources results in competition.
Interspecific
Intraspecific

12. Interspecific Competition
competition between species.
Intraspecific Competition
competition among members of the same species.

13. Density
the population density of an organism depends on their requirement for space.
Density-dependent factors: factors that increase in significance as a population grows. Example: food shortage.
Density-independent factors: factors that affect a population regardless of its size. Example: flood or fire.