Audiogram of the non-echolocating Dog-faced Fruit Bat (Cynopterus brachyotis)
Data from: Heffner, R.S., Koay, G., and Heffner, H.E. (2006) Hearing in large (Eidolon helvum) and small (Cynopterus brachyotis) non-echolocating fruit bats. Hearing Research 221, 17-25.
Absolute thresholds (in dB re 20 µPa) for two Dog-faced Fruit Bats (designated A and B)
|
Frequency (in kHz) |
|
||
|
A |
B |
Average |
|
|
1.4 |
76 |
87 |
81.5 |
|
2 |
68.5 |
70 |
69.25 |
|
2.8 |
59.25 |
— |
|
|
4 |
45.5 |
38.5 |
42 |
|
5.6 |
29.5 |
— |
|
|
8 |
13 |
11 |
12 |
|
10 |
6.5 |
6.5 |
6.5 |
|
12.5 |
9.5 |
10.5 |
10 |
|
16 |
16 |
— |
|
|
20 |
23 |
24.5 |
23.75 |
|
25 |
11.5 |
12.5 |
12 |
|
32 |
17.5 |
19 |
18.25 |
|
40 |
22 |
— |
|
|
50 |
30 |
33 |
31.5 |
|
64 |
45 |
49 |
47 |
|
80 |
81 |
88.5 |
84.75 |
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 |
1.97 |
73 |
|
60 |
2.63 |
70 |
|
50 |
3.25 |
65 |
|
40 |
4.2 |
57 |
|
30 |
5.33 |
47.5 |
Additional Parameters:
Body weight = 33 g
Functional interaural distance = 86 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data