Bibliography Record
x |
|
Gerstein, Edmund R.; Gerstein, Laura; Forsythe, Steven E.; Blue, Joseph E.
(detail)
|
| |
|
1999 |
The underwater audiogram of the West Indian manatee (Trichechus manatus).
Jour. Acoustical Soc. Amer. 105(6): 3575-3587. 2 tabs. 7 figs. June 1999.
–Behavioral experiments on two captive adult Florida manatees produced a U-shaped audiogram with auditory thresholds at 0.4 and 46 kHz and maximum sensitivity between 6 and 20 kHz. Detection thresholds of possible vibrotactile origin were measured at 0.015-0.2 kHz. Sensitivity falls 20 dB per octave below 0.8 kHz and approximately 40 dB per octave above 26 kHz. The audiogram demonstrates a wider range of hearing and greater sensitivity than was suggested by evoked-potential and anatomical studies. Inadequate sensitivity at low frequencies may contribute to manatees' inability to avoid collisions with motorboats. Use of high-frequency directional acoustic beacons on boats is suggested as a remedy.
|
Related Index Records (5)
|
Behavior, Investigative, and Sense Perception
(SEE ALSO: Sense Organs; Sound Production)
|
| |
x |
|
* |
1999 |
Gerstein et al. (TML; underwater audiogram; 3575-3583.) |
|
|
|
Captivity, Sirenians in
(SEE ALSO: Hunting and Capture; Weed Control)
|
| |
x |
|
|
1999 |
Gerstein et al. (TML; Lowry Park Zoo, Tampa; hearing experiments; 3575-3583.) |
|
|
|
Food
(SEE ALSO: Behavior, Ingestive; Captivity, Sirenians in; Digestive System; Food Plants; Weed Control) (NOTE: Plants reported as part of the captive but not the natural diet of sirs. will not necessarily be found under Food Plants. Papers referring to them are, however, indexed here.)
|
| |
x |
|
|
1999 |
Gerstein et al. (TML; in capt.; food rewards used in training; 3575.) |
|
|
|
Trichechus inunguis (Natterer in von Pelzeln, 1883) Thomas and Lydekker, 1897
|
| |
x |
|
|
1999 |
Gerstein et al. (hearing, comp. w/ TML; 3580.) |
|
|
|
Trichechus manatus latirostris (Harlan, 1824) Hatt, 1934
|
| |
x |
|
|
1999 |
Gerstein et al. (underwater audiogram; 3575-3583.) |
|
|
|