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Population

  • A population is a group of individuals from one species living in a given area.
  • Mortality is the number of deaths per a given population or standardized population size. A survivorship curve represents how the mortality of the species varies with age.
  • Biotic potential is the maximum rate at which a given population could grow under ideal conditions. Exponential growth is the type of growth a population experiences under ideal conditions.
  • Carrying Capacity (K) is the maximum number of individuals that can occupy an area under given conditions. The logistic model shows growth rate from the time a population is introduced to an area to the time it reaches its carrying capacity.

    Growth Rate = r N (1 – N / K)

  • “r- selected” species have rapid population growth when obstacles are limited. They quickly reach carrying capacity. “K-selected” species tend to dominate in stable, established environments.

Population

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AP Biology Intro