3 Populations (PDF)
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Title: Populations
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Characteristics of Populations
Geographic
Distribution
Density
Growth rate
Population Growth
Population Growth – an
increase in the size of a
population over time
Factors that affect
population growth
# of Births
# of Deaths
# of individuals
that enter or
leave
Population Growth
Dollars earned
Is not linear…
Time in hours
Population Growth
But exponential- as a population gets
Population size
larger, it also grows faster.
Time
Population Growth
Has limits
Limiting factors-
cause a population
to stop increasingDensity dependent
factors have an
increasing effect as
the population
increases
Density Dependent Factors
Disease
Competition for
resources-food,
water, mates,
territories,
nesting sites
Predation
Stress
How do increases and decreases in the
moose population affect the wolf
population?
60
2400
50
2000
40
1600
30
1200
20
800
10
400
0
1955
1960
1965
1970
1975
Moose
1980
Wolves
1985
1990
1995
Density independent factors –affect all
populations regardless of density
Temperature
Storms
Floods
Droughts
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