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Limits to Population Growth. What slows the growth of populations?. Limiting Factors Density-dependent limiting factors : limiting factors that are dependent on population size

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what slows the growth of populations
What slows the growth of populations?
  • Limiting Factors
  • Density-dependent limiting factors: limiting factors that are dependent on population size
  • Density-independent limiting factors: limiting factors that affect the same percentage of a population regardless of its size.
density dependent limiting factors
Density-dependent limiting factors
  • Food supply
  • Predation
  • Disease
  • Related to competition and interactions between organisms.
  • Greater effect in larger populations.
density dependent limiting factors1
Density-dependent limiting factors
  • Populations controlled by density-dependent factors show an S-shaped curve on a graph.
  • Exponential growth at first, then growth slows and stops at the carrying capacity. p.81
density independent factors
Density-independent factors
  • Natural disasters
    • Hurricane
    • Fire
    • Tsunami
    • Limit growth of population by destroying habitat.
density independent limiting factors
Density-independent limiting factors
  • Populations controlled by density-dependent factors show a boom and bust on a graph
  • Exponential growth when conditions are favorable, then many die when conditions change.
  • Thrips, aphids, and other

Insects (pg 127)

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