Audiogram of the non-echolocating Straw-colored Fruit Bat (Eidolon helvum)
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 Straw-colored Fruit Bats (designated A and B)
|
Frequency (in kHz) |
|
|||
|
A |
B |
Average |
|
|
|
.8 |
84.5 |
77 |
81 |
|
|
1 |
73 |
69.5 |
71.5 |
|
|
2 |
51.5 |
49 |
50.5 |
|
|
4 |
30 |
27.5 |
29 |
|
|
5.6 |
20 |
18.5 |
19.5 |
|
|
8 |
12 |
8 |
10 |
|
|
10 |
13 |
12 |
12.5 |
|
|
12.5 |
18 |
16.5 |
17.5 |
|
|
16 |
24.5 |
25 |
25 |
|
|
20 |
15.5 |
12 |
14 |
|
|
25 |
24.5 |
20.5 |
22.5 |
|
|
32 |
38.5 |
34.5 |
36.5 |
|
|
40 |
56 |
54.5 |
55.5 |
|
|
45 |
73.5 |
77.5 |
75.5 |
|
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 |
1.05 |
43.5 |
|
60 |
1.38 |
41.3 |
|
50 |
2.05 |
37.7 |
|
40 |
2.83 |
33.7 |
|
30 |
3.85 |
29.0 |
Additional Parameters:
Body weight = 300 g
Functional interaural distance= 145 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data