Literaturdatenbank
Literaturdatenbank |
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Lenhardt, M. L. (2002). Sea turtle auditory behavior (abstract). Journal of the Acoustical Society of America, 112(5), 2314.
Added by: Admin (21 Nov 2009 11:53:17 UTC) |
| Resource type: Journal Article BibTeX citation key: Lenhardt2002 View all bibliographic details  |
Categories: General Keywords: akustische Kommunikation = acoustic communication, Caretta, Caretta caretta, Cheloniidae, Physiologie = physiology, Schildkröten = turtles + tortoises Creators: Lenhardt Collection: Journal of the Acoustical Society of America |
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| Abstract |
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Little is known of sea turtles' auditory behavior. Startles (neck contractions) were observed in 25 loggerheads (Caretta caretta) to tones from 35 to 1000 Hz, when the turtles were near the bottom of holding tanks at a depth of 1 meter. A composite audiogram revealed lowest thresholds in the 400–500 Hz range (106 dB SPL re 1 µm). Thresholds at 735 and 1000 Hz were 117 and 156 dB, respectively. Thresholds in the 100–200 Hz range were ~124 dB, with lower frequencies being 10–12 dB higher. Tank diving behavior was elicited with 30 Hz at 164 dB. ABR thresholds to vibration clicks with peak energy at 500 Hz were 113 dB. Seismic air guns (Bolt 600) were employed in a large net enclosure. Turtles increased swimming speed for exposures in the 151–161 dB levels. Avoidance ~175 dB was common in initial trials, before habituation. ABRs pre- and post-air gun exposures revealed TTS of more than 15 dB in one animal with recovery in 2 weeks. Air guns in depths >10 m may result in more energy in the low frequencies with unknown bioeffects. Turtle repelling with sound is possible and can be made practical (Lenhardt, US Patent No. 6388949).
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