Limiting Factors

Limiting Factors

Density-dependent factors

and

Density-independent factors

Limiting Factors

Limiting factors are factors that limit the growth of a population and cause it to decrease.

https://www.youtube.com/watch?v=pPw51fDTl68

There are two types of limiting factors:

• Density-dependent factors depend on the size of the population and occur only when the population reaches a certain level.

• Density-independent factors affect all populations regardless of the population size.

Density-dependent factors

• Competition

• Predation

• Disease

• Parasitism

• Crowding

Density-independent factors

• Natural disasters

• Temperature

• Sunlight

• Human activities

• Physical characteristics

• Behaviors

Density-dependent and density-independent factors can limit the growth of populations.

• Density-dependent factors are those that have a greater effect as the population increases.

• Density-independent factors are those that affect all populations, regardless of their density.

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Multiple Choice

Which of the following is a density-dependent factor?

• Drought

• Tornado

• Temperature

• Competition

Multiple Choice

Which of the following is a density-dependent factor?

• Lightening

• Earthquake

• Predation

• Floods

Multiple Choice

Which of the following is a density-independent factor?

• Disease

• Competition

• Floods

• Predation

Multiple Choice

Which of the following is a density-independent factor?

• Wildfire

• Food supply

• Disease

• Competition