Table 4.

Song structure and variability measures (mean ± SEM)

	Day 7* (n = 5)	Day 20* (n = 6)	t**	p**
Whole song duration (sec)
Mean	1.80  ± 0.07	1.84  ± 0.09	−0.341	0.37
CV4-a	12.85  ± 2.88	6.35  ± 2.09	1.872	0.05
Whistle duration (sec)
Mean	0.51  ± 0.01	0.52  ± 0.02	−0.569	0.29
CV	9.65  ± 1.56	5.45  ± 1.24	2.142	0.03
Warble duration (sec)
Mean	0.41  ± 0.03	0.39  ± 0.02	0.479	0.32
CV	5.42  ± 1.26	3.03  ± 0.36	1.987	0.04
1st buzz duration (sec)
Mean	0.24  ± 0.01	0.24  ± 0.02	−0.252	0.41
CV	9.35  ± 2.32	5.93  ± 1.57	1.566	0.08
Whistle minimum frequency (kHz)
Mean	3.72  ± 0.28	3.70  ± 0.25	0.065	0.48
CV	1.91  ± 0.23	1.02  ± 0.17	3.186	0.01
Whistle maximum frequency (kHz)
Mean	4.18  ± 0.30	3.99  ± 0.23	0.505	0.32
CV	2.59  ± 0.43	1.28  ± 0.12	3.166	0.01
Warble minimum frequency (kHz)
Mean	2.95  ± 0.17	3.15  ± 0.22	−0.706	0.25
CV	3.24  ± 0.35	2.66  ± 0.30	1.248	0.12
Warble maximum frequency (kHz)
Mean	5.12  ± 0.29	5.46  ± 0.31	−0.789	0.23
CV	3.68  ± 0.33	2.16  ± 0.32	3.308	0.01
1st buzz minimum frequency (kHz)
Mean	4.19  ± 0.14	4.23  ± 0.11	−0.190	0.43
CV	5.12  ± 1.69	2.27  ± 0.27	1.833	0.05
1st buzz maximum frequency (kHz)
Mean	6.08  ± 0.17	5.88  ± 0.08	1.142	0.14
CV	3.60  ± 0.83	2.26  ± 0.34	1.598	0.08

*Interval between exposure to LD + T and killing.

**Student's unpaired t test (one-tailed). df = 9 for all comparisons.

^F4-aCV = SD/mean × 100.