Bibliography and Index of the Sirenia and Desmostylia  

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"Bauer, Gordon Bruce"

Bauer, Gordon Bruce: SEE Colbert & Bauer, 1999; Colbert et al., 2001. (detail)
 
 
 Colbert, Debborah E.; Bauer, Gordon Bruce (detail)
   
1999
Basic husbandry training of two West Indian manatees (Trichechus manatus latirostris).
Soundings 24: 18-21.
 
 
 Colbert, Debborah E.; Fellner, Wendi; Bauer, Gordon Bruce; Manire, Charles A.; Rhinehart, Howard L. (detail)
   
2001
Husbandry and research training of two Florida manatees (Trichechus manatus latirostris).
Aquatic Mammals 27(1): 16-23.
 
 
 Bauer, Gordon Bruce; Colbert, Debborah E.; Gaspard, Joseph C., III; Littlefield, B.; Fellner, Wendi (detail)
   
2003
Underwater visual acuity of Florida manatees.
Intl. Jour. Comp. Psychol. 16: 130-142.
 
 
 Mann, David A.; Colbert, Debborah E.; Gaspard, Joseph C., III; Casper, Brandon M.; Cook, Mandy L. H.; Reep, Roger Lyons; Bauer, Gordon Bruce (detail)
   
2005
Temporal resolution of the Florida manatee (Trichechus manatus latirostris) auditory system.
Jour. Comp. Physiol. A, Sensory, Neural & Behav. Physiol. 191(10): 903-908.
 
 
 Colbert, Debborah E.; Gaspard, Joseph C., III; Reep, Roger Lyons; Mann, David A.; Bauer, Gordon Bruce (detail)
   
2009
Four-choice sound localization abilities of two Florida manatees, Trichechus manatus latirostris.
Jour. Exper. Biol. 212(13): 2105-2112. DOI: 10.1242/jeb.089227.
 
 
 Gaspard, Joseph C., III; Bauer, Gordon Bruce; Reep, Roger Lyons; Dziuk, Kimberly; Cardwell, Adrienne; Read, LaToshia; Mann, David A. (detail)
   
2012
Audiogram and auditory critical ratios of two Florida manatees (Trichechus manatus latirostris).
Jour. Exper. Biol. 215(9): 1442-1447. DOI:10.1242/jeb.089201. May 2012.
–There is also a comment on this article by Kathryn Knight on p. i of this issue.
 ABSTRACT: Manatees inhabit turbid, shallow-water environments and have been shown to have poor visual acuity. Previous studies on hearing have demonstrated that manatees possess good hearing and sound localization abilities. The goals of this research were to determine the hearing abilities of two captive subjects and measure critical ratios to understand the capacity of manatees to detect tonal signals, such as manatee vocalizations, in the presence of noise. This study was also undertaken to better understand individual variability, which has been encountered during behavioral research with manatees. Two Florida manatees (Trichechus manatus latirostris) were tested in a go/no-go paradigm using a modified staircase method, with incorporated 'catch' trials at a 1: 1 ratio, to assess their ability to detect single-frequency tonal stimuli. The behavioral audiograms indicated that the manatees' auditory frequency detection for tonal stimuli ranged from 0.25 to 90.5 kHz, with peak sensitivity extending from 8 to 32 kHz. Critical ratios, thresholds for tone detection in the presence of background masking noise, were determined with one-octave wide noise bands, 7-12 dB (spectrum level) above the thresholds determined for the audiogram under quiet conditions. Manatees appear to have quite low critical ratios, especially at 8 kHz, where the ratio was 18.3 dB for one manatee. This suggests that manatee hearing is sensitive in the presence of background noise and that they may have relatively narrow filters in the tested frequency range.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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