Population dynamics

1
Population dynamics

• What is a population
• a group of the same species, that live in a
  specific area

2
How fast do populations grow

• A J curve is used to represent population growth
• Starts slow
• Accelerates
• exponentially
• Until?

3

• You add limiting factors eventually the species
  reaches
• its carrying capacity

4

• Density dependent- mostly biotic
• Disease
• Competition
• Predators
• Parasites
• food
• Density independent- mostly abiotic
• Volcanic eruptions
• Temperature
• Storms
• Floods
• Drought
• Chemical pesticides

5
Density factors

• Three types
• Random
• Uniform
• Clumped

6
Organism InteractionsLimit Population Size

• Predation
• Competition within a population
• Crowding and stress

7
Human Population

• Demography
• Birthrate
• Death rate
• Birthrate- Death rate population growth rate
  (PGR)
• Doubling Time