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Ketten, D. R., & Bartol, S. M. Functional measures of sea turtle hearing. WOODS HOLE OCEANOGRAPHIC INST MA BIOLOGY DEPT. 
Added by: Admin (21 Nov 2009 11:59:58 UTC)
Resource type: Unpublished Work
BibTeX citation key: Ketten2005
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Categories: General
Keywords: akustische Kommunikation = acoustic communication, Caretta, Caretta caretta, Chelonia, Chelonia mydas, Cheloniidae, Physiologie = physiology, Schildkröten = turtles + tortoises
Creators: Bartol, Ketten
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Abstract : Sea turtle hearing was investigated morphometrically by analyzing variations in auditory anatomy a and physiologically by brainstem evoked potential techniques. Auditory brainstem responses (ABRs) were collected from multiple species and life stages of live sea turtles using an stimulus coupled directly to the turtle's tympanum underwater. A three electrode array was used to record the evoked responses to stimuli. Anatomical data were obtained by computerized tomography (CT and MRI) and histology ABRs obtained from 12 hatchling through sub-adult turtles (Lepidochelys kempi, Chelonia mydas, Caretta caretta) show juvenile green turtles have a slightly broader hearing range (100-800 Hz; best sensitivity 600-700 Hz ) than sub-adults (range 100-500 Hz). Kemp's Ridleys had a more restricted range (100-500 Hz) with most sensitive hearing at 100-200 Hz. Although this project suggests there are measurable age and species variations in response to underwater sound, the overall results are consistent with prior results for aerial and vibrational stimuli.
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