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3 Populations .pdf



Original filename: 3 Populations.pdf
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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