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 N/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 = ??? s

(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.