1
0
0
3
2
10
2
2
50
1
0
1.00
100
0
xl
x
m
x
l
x
m
x
m
x
l
x
n
x
x
R
o
=
T =
The population is ___________ in size (growing, shrinking, or stable)
Lecture Quiz #4
Demography
•
Demography is the science of measuring the
important phenomena that collectively provide
numerical descriptions of a
population
– the number of individuals within it
– their birth rates and death rates
– movements of individuals between populations of the
same species
– the change in the number of individuals through time
N
now
= N
past
+ B – D + I + E
•
N = population size (number of individuals)
•
B = births (aka, natality)
•
D = deaths (aka, mortality)
– the “flip” side of mortality is survival
•
I = immigrants
•
E = emigrants
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2
Ages
, or stages
•
When information is assembled about a
population, this information is usually
arranged in a manner that indicates how
individuals of different
ages
(or
stages
)
contribute to the population as a whole
•
These compilations of age- or stage-
specific data are called
life tables

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- Spring '08
- BAKER
- Ecology, Demography, Threespine stickleback, threespine stickleback population
-
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