1980
l=j
100
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;'\~'i"/'~','~'"\;"'\../\i"'\,"'"' .'j~~""'"
' ' ' ' \;' ' ' ' \""'\/~'~"'~
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8
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Q
a
a
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::s
g'
o'
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~
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on
~
::s
Q.
t:l
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S'
on
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...
1985
1986
1988
9 50
1000j
400
100
1=]
100
. .
%
!
>
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a
w
IE:
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10
20
30
TIME
IN SECONDS
40
50
60
.....
~
FIGURE 4.10. Spectrograms of songs of bowhead whales, Balaena mysticetus,
recorded from four years (1980, 1985, 1986, and 1988) as
the whales migrated east past Point Barrow, Alaska. (From Wiirsig and Clark 1993.)