Audiogram of the False Killer Whale (Pseudorca crassidens)
听
Data from:
Thomas, J., Chun, N., and Au, W. (1988)
Yuen, M.M.L., Nachtigall, P.E., and Breese, M. (2005) Behavioral and auditory evoked potential audiograms of a false killer whale (Pseudorca crassidens). Journal of the Acoustical Society of America, 118, 2688-2695. This is the same individual tested by Tomas et al.; authors state that 鈥渢his animal probably suffered some hearing loss associated with age or presbycusis鈥�.
听
Average behavioral absolute thresholds for false killer whales
听
|
Frequency (in kHz) |
Thomas et al. |
Yuen et al. |
Thomas et al. |
|
dB re 1 渭笔补 |
dB re 1 渭笔补 |
dB re 20 渭笔补* |
|
|
2 |
99 |
听 |
73 |
|
4 |
80 |
99.5 |
54 |
|
5 |
听 |
94.4 |
听 |
|
7 |
听 |
89.3 |
听 |
|
8 |
64 |
82.7 |
38 |
|
10 |
听 |
84.5 |
听 |
|
14 |
听 |
87.3 |
听 |
|
15 |
听 |
78.6 |
听 |
|
16 |
49 |
79.7 |
23 |
|
19 |
听 |
71.6 |
听 |
|
20 |
听 |
69.5 |
听 |
|
22.5 |
听 |
76.1 |
听 |
|
24 |
听 |
71.3 |
听 |
|
27 |
听 |
80.2 |
听 |
|
32 |
45 |
104.2 |
19 |
|
38 |
听 |
112.3 |
听 |
|
45 |
听 |
122.1 |
听 |
|
64 |
39.5 |
听 |
13.5 |
|
85 |
76 |
听 |
50 |
|
105 |
81 |
听 |
55 |
|
110 |
94 |
听 |
68 |
|
115 |
116 |
听 |
90 |
听
Lowest and highest frequencies audible at sound
pressure levels (SPL) ranging from 30 to 70 dB SPL
听
|
SPL (in dB) |
Lowest audible frequency (in kHz) |
Highest audible frequency (in kHz) |
|
70 |
2.4 |
111 |
|
60 |
3.4 |
104 |
|
50 |
4.8 |
85 |
|
40 |
7.4 |
79 |
|
30 |
12 |
77 |
听
Additional Parameters:
Body weight = 18 year old animal was 700 kg (species grows to 1300 kg)
Functional interaural distance = ?? 碌s
(Time required for sound in water to travel through the head from one auditory meatus to the other.)
听
Comments: Threshold values taken from published article.
*conversion from reference level of 1 渭Pa used in underwater hearing to 20 渭Pa used in air hearing by subtracting 26 dB
听