Audiogram of the ground-gleaning bat (Megaderma lyra)
Ìý
Data from: Schmidt, S., Turke, B., and Vogler, B. (1983). Behavioural audiogram from the bat, Megaderma lyra. Myotis, 21/22, 62-66.
Neuweiler, G. (1984). Foraging, echolocation, and audition in bats. Naturwissenschaften, 71, 446-455.
Average absolute thresholds (in dB re 20 µN/m2) for an unknown number of ground gleaning bats
|
Ìý Frequency (in kHz) |
Average Threshold (in dB) |
Ìý |
| Ìý | ||
|
1 |
68 |
Ìý |
|
4 |
47 |
Ìý |
|
7 |
49 |
Ìý |
|
10 |
36 |
Ìý |
|
13.3 |
18 |
Ìý |
|
15 |
20 |
Ìý |
|
16 |
-6 |
Ìý |
|
18 |
-10 |
Ìý |
|
22 |
-7 |
Ìý |
|
30 |
-16 |
Ìý |
|
35 |
-10 |
Ìý |
|
40 |
-9 |
Ìý |
|
45 |
-5 |
Ìý |
|
50 |
2 |
Ìý |
|
55 |
-2 |
Ìý |
|
60 |
-1 |
Ìý |
|
65 |
-6 |
Ìý |
|
75 |
-5 |
Ìý |
|
83 |
-3 |
Ìý |
|
90 |
8 |
Ìý |
|
105 |
22 |
Ìý |
|
110 |
25 |
Ìý |
|
130 |
35 |
Ìý |
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 |
.900 |
— |
|
60 |
1.7 |
— |
|
50 |
3.2 |
160* |
|
40 |
9 |
140* |
|
30 |
11 |
120 |
*extrapolated values
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Additional Parameters:
Body weight = 50 g
Functional interaural distance= ? µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
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Comments: Threshold values taken from table in Fay, R.R.(1988) Hearing in Vertebrates: A Psychophysics Databook. Hill-FayAssociates, Winnetka, IL.