Chapter 5 Populations. Chapter 5 Sec 1: How Populations Grow There are three important...

Chapter 5 PopulationsChapter 5 Populations

Chapter 5 Sec 1: How Populations GrowThere are three important

characteristics of a population: _________________________

distribution (location) Density (how many) ___________________ rate

Population density The number of individuals per unit

area. Individuals Pop. Density

Area

Example: There are 800 deer in a 40 acre plot of land. What is the population density of the deer population?

Population GrowthThey’re 3 factors that can affect a populations

size :

The number of ______________

The number of _______________

The number of individuals that ___________ or ____________ a population

Immigration: The movement of individuals ____________an area.

Emigration: The movement of individuals __________of an area.

TYPES OF GROWTH

Exponential- “J” shaped curve. Slow growth at first with a sharp increase.

Under ideal conditions with unlimited resources, a population will grow exponentially

Logistic- “S” shaped curve.

As resources become less available, the growth of a population slows or stops.

Populations reach Carrying Capacity

Carrying Capacity:

The Maximum (largest) number of individuals that an environment can support.

Section 2: Limits to Growth Limiting Factors: a factor that

causes population growth to _________________.

There are 2 types: 1) Density-dependent 2) Density-independent

Density-dependent

Depends of the population’s _______________.

Example: Competition, Predation, Parasitism, & Disease

Density-independent Does not depend on the populations’

size.

Example: Drought, Human Disturbances, Hurricane, Etc.

Chapter 5 Section 3:Human Population Growth Like other populations, the human

population increases with time.

The Agricultural Revolution & Industrial Revolution contributed to the rapid increase in the human population

Agricultural Revolution

Populations changed from hunting & gathering to an agriculturally based civilization.

The Demographic Transition Frank Notestein is a scientist in

the field of Demography

Designed a theory that explains the pattern of human population growth

“Economic & social progress of the industrial revolution affects population growth in 3 stages”

Stage1: Both birth & death rates are high in pre-industrial societies, & the population grows slowly if at all.

Stage 2: When health care improves, the population size increases. Birth rates continue to be high & people are living longer

Stage 3: Birth rates fall until they are roughly equal to death rates, & population growth slows down & stops.

Age Structure Diagram

Show the population of a country broken into categories based on age & gender.

Chp. 5 Test review

Role Dice to determine the level of question.

You may pick one level

Continue to role until all questions are answered.