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Title:

Population dynamics

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Population dynamics What is a population a group of the same species, that live in a specific area How fast do populations grow A J curve is used to represent ... – PowerPoint PPT presentation

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Title: 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
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