Audiogram of the Jamaican fruit bat (Artibeus jamaicensis)
Data from: Heffner, R.S., Koay, G., and Heffner, H.E. (2003) Hearing in American leaf-nosed bats. III: Artibeus jamaicensis. Hearing Research 184, 113-122.
Absolute thresholds (in dB re 20 µN/m2) for three Jamaican fruit bats (designated A, B and C)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
||
|
A |
B |
C |
||
|
1 |
88 |
— |
— |
88 |
|
2 |
69.5 |
72 |
70.5 |
70.7 |
|
2.8 |
59 |
60 |
60.5 |
59.8 |
|
4 |
49 |
— |
— |
|
|
5.6 |
38.5 |
41.5 |
38.5 |
39.5 |
|
8 |
29 |
— |
— |
|
|
12 |
13 |
16 |
12 |
13.7 |
|
16 |
10.5 |
8.5 |
7 |
8.7 |
|
20 |
14.5 |
— |
— |
|
|
32 |
15.5 |
15 |
13.5 |
14.7 |
|
40 |
21 |
21.5 |
23 |
21.8 |
|
45 |
17.5 |
— |
— |
|
|
50 |
11 |
19.5 |
16.5 |
15.7 |
|
56 |
9.5 |
16 |
13.5 |
13 |
|
64 |
16.5 |
— |
— |
|
|
71 |
24.5 |
— |
— |
|
|
80 |
29.5 |
30.5 |
26 |
28.7 |
|
90 |
44 |
41.5 |
39.5 |
41.67 |
|
100 |
38.5 |
33.5 |
32.5 |
34.8 |
|
110 |
41.5 |
40 |
35.5 |
39 |
|
125 |
53.5 |
— |
— |
|
|
140 |
72 |
70 |
65.5 |
69.2 |
Lowest and highest frequencies audible at sound
pressure levels (SPL) ranging from 30 to 70 dB SPL
|
SPL (in dB) |
Lowest audible frequency (in kHz) |
Highest audible frequency (in kHz) |
|
70 |
2 |
141 |
|
60 |
2.8 |
130 |
|
50 |
4 |
120 |
|
40 |
5.6 |
110 |
|
30 |
7.4 |
80 |
Additional Parameters:
Body weight = 41 g
Functional interaural distance= 89 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data