Audiogram of the northern elephant seal in air (Mirounga angustirostris)
Data from: Kastak, D., and Schusterman, R.J. (1999) In-air and underwater hearing sensitivity of a northern elephant seal (Mirounga angustirostris). Canadian Journal of Zoology, 77, 1751-1758.
Absolute thresholds (in dB re 2 µN/m2) for an elephant seal in air
|
Frequency (in kHz) |
Average Threshold (in dB) |
|
|
.100 |
78.6 |
|
|
.200 |
72 |
|
|
.400 |
68.8 |
|
|
.800 |
57.3 |
|
|
1.6 |
55.3 |
|
|
3.2 |
52.7 |
|
|
6.4 |
44 |
|
|
8 |
45 |
|
|
15 |
52 |
|
|
18 |
50 |
|
|
23 |
60 |
|
|
28 |
67 |
|
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 |
.300 |
31 |
|
60 |
.660 |
23 |
|
50 |
3.8 |
18 |
|
40 |
— |
— |
|
30 |
— |
— |
Additional Parameters:
Body weight = ??? g
Functional interaural distance = ??? µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from graph in Kastak and Schusterman, 1999.