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SECTION 8.1 NOTES. UNDERSTANDING POPULATIONS. What is a Population? . Members of the same species (reproduce with one another) Live in the same place (Geographic location) Live at the same time (Past, Present, or Future). How Fast Can a Population Grow?.

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section 8 1 notes

SECTION 8.1 NOTES

UNDERSTANDING POPULATIONS

what is a population
What is a Population?
  • Members of the same species (reproduce with one another)
  • Live in the same place (Geographic location)
  • Live at the same time (Past, Present, or Future)
how fast can a population grow
How Fast Can a Population Grow?
  • Death Rate + Birth Rate = Growth Rate
  • Populations usually stay about the same.
  • Reproductive Potential
    • Fastest rate an organism can grow
    • Increase when organisms reproduce more often
    • Small organisms (bacteria) usually reproduce quicker than larger organisms (humans)
exponential growth
Exponential Growth
  • Organisms Grow faster and faster over time!
  • Conditions
    • Plenty of Food, Space, and no competition or predators
what limits population growth
What Limits Population Growth?
  • Environment Changes
  • Resources are Used Up
  • Death Increases
  • Births Decrease
  • Carrying Capacity
    • Maximum population that the ecosystem for a particular species can support.
resource limits
Resource Limits
  • Limiting Resources such as sunlight, nutrients, water.
  • Carrying capacity is reached when the resource is consumed at the rate that it is made!
competition within a population
Competition within a population
  • Organisms compete for resources such as:
    • Territory – Living Space
    • Mates
    • Food
    • Homes/Shelter
two types population regulation
Two Types Population Regulation
  • Density Dependent – cause of death is related to issues of overcrowding/space.
  • Density Independent – Not related to number of organisms but other factors such as weather, natural disasters, etc.
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