176
J.W. Boughman and C.F. Moss
8
6
4
0.6
0.4
0.2
Resident
Transfer
PreMove
1 Month 5 Months
PreMove
1 Month 5 Months
-35
-45
-55
-65
-45
-55
-65
-75
2
4
6
8
10 12
2
4
6
8
10 12
2
4
6
8 10 12 14
0
1.0
2.0
3.0
Frequency : kHz
Time : s
Frequency : kHz
Frequency : kHz
A)
B)
C)
D)
E)
F)
-55
-65
-75
-85
14
10
6
2
Postmove
Postmove
Postmove
Premove
Resident
Resident
Transfer
Transfer
Amplitude : dB
Amplitude : dB
Amplitude : dB
Frequency : kHz
Frequency : kHz
Time : s
Figure 4.6. Greater spear-nosed bat screech calls and changes in acoustics after bats
were moved between social groups. (A) Power spectrum and (B) sonogram of
screech call. (C) Mean bandwidth and (D) repetition rate for group 2 residents
(solid bars) and transfers (open bars) before and after social contact. Residents
remained in their natal group, whereas transfers immigrated from another social
group during the experiment. Premove periods are before this immigration event;
postmove periods are after it. (E) Power spectra for group 2 residents and transfers
before and (F) after social contact. (From Boughman 1998. Reprinted with permission from The Royal Society.)