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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.