Density-dependent

Definition

Density-dependent factors are environmental factors whose effects on a population change as the population density changes. These factors typically lead to regulation of population size through mechanisms such as competition, predation, and disease.

5 Must Know Facts For Your Next Test

1. Density-dependent factors intensify as the population increases in size.
2. Common examples include food availability, predation pressure, and disease spread.
3. They play a crucial role in maintaining population equilibrium by reducing growth rates at higher densities.
4. Competition for resources is a primary density-dependent factor affecting population dynamics.
5. Density-dependent regulation can lead to oscillations or cycles in population sizes over time.

Review Questions

• How do density-dependent factors influence population growth?
• What are some common examples of density-dependent factors?
• Why are density-dependent factors important for maintaining population equilibrium?

Related terms

Carrying Capacity: The maximum number of individuals an environment can support sustainably.

Density-Independent Factors: Environmental factors that affect populations regardless of their size, such as natural disasters.

Intraspecific Competition: Competition among members of the same species for limited resources.