ECOLOGY POPULATIONS

How populations grow The number of individuals per unit of area is the Population Density. It is one of the main characteristics that describe a natural population.

The population density of Buford is 720 people per square mile. How populations grow The population density of Buford is 720 people per square mile.

The population density of Atlanta is 3,161 people per square mile.. How populations grow The population density of Atlanta is 3,161 people per square mile..

How populations grow The population density of Union County in the north Georgia mountains is 31 per square mile.

How populations grow In science, the metric system is used. For instance, the density of deer in rural north Georgia is 11 to 17 deer per square kilometer.

The movement of individuals INTO an area is called Immigration. How populations grow The movement of individuals INTO an area is called Immigration.

The movement of individuals OUT of an area is called Emigration. How populations grow The movement of individuals OUT of an area is called Emigration.

How populations grow Exponential Growth occurs when the population grows at a constant rate.

How populations grow Logistic Growth occurs when the population’s growth slows or stops following a period of exponential growth.

How populations grow The number of individuals that an environment can support is the Carrying Capacity.

Limits to growth A Limiting Factor is a factor that causes population growth to decrease.

Limits to growth Limiting Factors are: COMPETITION

Limits to growth Limiting Factors are: PREDATION

Limits to growth Limiting Factors are: PARASITISM

Limits to growth Limiting Factors are: DISEASE

Limits to growth Limiting Factors are: DROUGHT

OTHER CLIMATE EXTREMES Limits to growth Limiting Factors are: OTHER CLIMATE EXTREMES

Limits to growth Limiting Factors are: HUMAN DISTURBANCES

Limits to growth Density – Dependent Limiting Factors depend on population size. Limiting factors that depend on population size are competition, predation, parasitism, and disease. These factors are stronger when a population is large and dense.

If there is a flu outbreak, where will it spread faster? Limits to growth If there is a flu outbreak, where will it spread faster? Atlanta, Buford, or north Georgia mountains?

Limits to growth Limiting Factors are: Competition – organisms compete for food, water, space, sunlight, and other essentials. The more individuals there are in an area, the sooner the available resources will be used up.

As the moose population increases from 1960 to 1965, the wolf population also increases. When the wolf population falls in 1966, the moose population shows a significant increase. As the wolf population increases after 1970, the moose population falls. As the wolf population falls after 1985, the moose population rises dramatically.  

Limits to growth Limiting Factors are: Unusual weather, natural disasters, seasonal cycles, and human activities are Density – Independent Limiting Factors.

Human Population Growth The human population tends to increase with time.

Human Population Growth Demography is the scientific study of human population.