1. Population Dynamics

2. WARM UP /18/14
Draw the chart below and describe each relationship in the box on the right.
Relationship
Description
Mutualism
Commensalism
Parasitism

3. Population Growth All organisms are members of populations
Populations die and grow at steady rate based on the amount of resources available

4. Exponential Growth Populations experience exponential growth
Initial increase in organisms is slow (small number of reproducing organisms)
Population then sharply increases due to high amount of reproduction

5. Exponential Growth
In exponential growth a populations rate of production grows
Limitations: S-Curves
Availability of food
Disease
Predators
Lack of space
A populations carrying capacity is the number of organisms than an environment can support
Births exceed deaths until resources run out

6. Carrying Capacity  = The number of individuals in a population that an environment can support over a long period of time

7. Factors affecting populations
Density Dependent Factor-Factors that have a stronger effect with increasing population
Disease
Predators
Parasites
Competition for food
Density Independent Factor-Affects the population regardless of density:
Volcanic Eruptions
Storms
Temperatures
Drought

8. Human Population
Demography-Study of human population size, density and distribution
United States Census is taken every 10 years

9. Human Population
Human growth is different from other organisms because humans have the ability to change their environment
Found cures for diseases
Found methods to produce food
Been able to provide clean water

10. Age Structure
Age Structure-Proportions of the population that are in different age groups
Age structure graph shows how many males and females there are in each age group

11. Write these definitions:
Exponential Growth: initial increase is slow, then increase sharply
Limiting Factor: A factor present in an environment that controls growth
Carrying Capacity: the number of organisms that an environment can hold over a long time
Density Dependent Factor-Factors that have a stronger effect with increasing population
Density Independent Factor-Affects the population regardless of density