1. Population
Dynamics

2. Properties of populations
Size: # of individuals it contains
Dispersion: spatial distribution of individuals in a population.
Clumped
Even
Random
Density: how crowded a population is

3. Population Dynamics Birth rate: # of births
Death/Mortality rate: # of death
Life Expectancy: avg. life span an individual is expected to live.

4. Population Growth Rate
Growth rate: amount by which a populations size changes over time.
Growth rate depends on: births, deaths, emigration and immigration.
Which 2 add to the population, which 2 take from the population?

5. Exponential Model of Growth
When a population increases rapidly after only a few generations; the larger the population gets the faster it grows.
Has a J shape (See blue line)

6. Logistic Growth
Builds on exponential growth but takes in account limiting factors.
Has an S shape (see red line)

7. Limiting Factors
populations cannot grow indefinitely because the resources they depend on become scarce and waste accumulate.
Competition becomes an issue as a pop. grows. As resources decrease the ability of individuals to fight off disease, grow and reproduce reduces.

8. Density Independent factors
A limiting factor that controls size.
Includes:
Natural Disaster (Floods, Fires)
Human Impact
Weather

9. Density Dependent factors
Are resource limitations.
Include:
Competition
Predation
Parasitism/Disease
Carrying Capacity: the total amount of individuals that an environment can sustain (hold)