Diversity and Interdependence of Life Unit 2

Test Review

Population Arrangement

• Population range: where members of a population are found (Grey Wolf Habitat)

Population Arrangement

• Population distribution: how individual members of populations are spread out within their range

O = INDIVIDUAL

WOLF PACKS

Population Arrangement

• Population density: the number of individual in a certain amount of space; this is a number

• Urban areas (cities) have a high population density

Population Density = the number of people/area

EX. New York City 58,821 people/square mile West Milton has 1,429 people/square mile

Population Growth

• These things affect a population’s growth rate:1. Birth Rate: how many individuals are born.

When the birth rate is higher than the death rate, the population increases.

2. Death Rate: how many individuals die. When the death rate is higher than the birth rate, the population decreases.

3. Immigration: how many individuals move into an area

4. Emigration: how many individuals exit an area

Population Growth

• If the population has unlimited resources and unlimited space, it will grow very rapidly, This rapid growth is called exponential growth.

# of people = 2n-1

n= the previous generation number

Population Growth

• Most populations have limiting factors; therefore, they show logistic growth.

Population Growth

PHASE 1:Exponential Growth

PHASE 2: Growth Rate Slows

PHASE 3: Growth Rate stops.Birth Rate = Death Rate

Population Growth

• These limiting factors can be density-dependent or density-independent.1. Density-Dependent Factors are factors that

control the growth of large populations.Examples of density-dependent factors

include food supply, water supply, disease, predation, competition, living space.

Population Growth

Population Growth

• These limiting factors can be density-dependent or density-independent.

2. Density-Independent Factors limit population growth regardless of the size of the population.

Example include catastrophic events such as earthquakes and volcanoes, severe

storms and flooding, extreme cold spells, etc.

Demography

• The study of the structure of human populations

• Age structures (population pyramids) are often used.

Population Geography

1

23

45

Population Geography

• Countries with high industrialization typically have high carbon dioxide emissions, which contribute to greenhouse gases and ultimately, global warming.

• Countries with high industrialization are also typically the wealthier countries.

Ecological Footprint

Ecological footprint: how much space and resources it takes to support a person’s lifestyle.

Ecological Hot Spot