Density Dependent and Independent Limiting Factors


Density dependent factors are factors whose effects on the size or growth of the population vary with the population density. There are many types of density dependent limiting factors, they include:
  1. Parasitism
  2. Availability of Food
  3. Predation
  4. Disease
  5. Migration

All of these are biotic factors and are related to a population nearing or surpassing its carrying capacity. For example, more organisms of a certain type deplete the food supply, causing others to die off and at the same time increase the chance of disease.

Density independent factors are factors that affects population size independent of the population density. There are many types of density independent limiting factors, they include:
  1. Natural Disasters (Earthquakes, Flash Flooding, Droughts)
  2. Weather Conditions (Temperature, Sunlight, etc.)
  3. Water Flow Through a Region
  4. Soil Quality

These factors are abiotic factors and are related to the random occurrence of events.