Youngless: Population Growth

Population

A group of individuals that belong to the same species and live in the same area

Exponential Growth

Population grows without limits because of unlimited resources

Exponential Growth Graph

What type of growth is this?

Logistic Growth

Populations grow quickly at first but levels off because of limited resources

Logistic Growth Graph

What type of growth is this?

Carrying Capacity

The largest population that an area can support

Population Density

Number of individuals per unit area of space

Birth

Immigration (moving into a population

What causes population number to increase?

Death

Emigration (moving out of a population)

What causes population numbers to decrease?

Limiting Factors

Environmental factors that restrict population growth are called?

Food

Water

Shelter

Sunlight

Disease

Weather

Temperature

What are examples of Limiting Factors?

Density Dependent Limiting Factor

Limiting factor that depends on population size is called?

competition, parasitism, predation, disease

Examples of density dependent limiting factors

Density Independent Limiting Factors

Limiting factor that affects all populations in similar ways, regardless of population size

Weather changes

Pollution

Natural Disaster

Examples of Density Independent Limiting Factors

Type I Survivorship

Usually experience high survival in early and middle life, followed by a rapid decline in later life.

Type II Survivorship

Experience roughly a constant death rate regardless of age. Prey animals such as birds can follow this pattern of survival.

Type III Survivorship

Experience the greatest mortality early on in life, with relatively low rates of death for those surviving.