Auditory temporal resolution of a wild white-beaked dolphin (<Emphasis Type="Italic">Lagenorhynchus albirostris</Emphasis>) |
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Authors: | T Aran Mooney Paul E Nachtigall Kristen A Taylor Marianne H Rasmussen Lee A Miller |
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Institution: | (1) Department of Zoology and Hawaii Institute of Marine Biology, University of Hawaii, P.O. Box 1106, Kailua, HI 96734, USA;(2) Húsavik Research Center, University of Iceland, Gardarsbraut 19, 640 Húsavik, Iceland;(3) Institute of Biology, University of Southern Denmark-Odense, Campusvej 55, 5230 Odense M, Denmark;(4) Present address: Department of Biology, Woods Hole Oceanographic Institution, Marine Research Facility, MS #50, 266 Woods Hole Road, Woods Hole, MA 02543, USA |
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Abstract: | Adequate temporal resolution is required across taxa to properly utilize amplitude modulated acoustic signals. Among mammals,
odontocete marine mammals are considered to have relatively high temporal resolution, which is a selective advantage when
processing fast traveling underwater sound. However, multiple methods used to estimate auditory temporal resolution have left
comparisons among odontocetes and other mammals somewhat vague. Here we present the estimated auditory temporal resolution
of an adult male white-beaked dolphin, (Lagenorhynchus albirostris), using auditory evoked potentials and click stimuli. Ours is the first of such studies performed on a wild dolphin in a
capture-and-release scenario. The white-beaked dolphin followed rhythmic clicks up to a rate of approximately 1,125–1,250 Hz,
after which the modulation rate transfer function (MRTF) cut-off steeply. However, 10% of the maximum response was still found
at 1,450 Hz indicating high temporal resolution. The MRTF was similar in shape and bandwidth to that of other odontocetes.
The estimated maximal temporal resolution of white-beaked dolphins and other odontocetes was approximately twice that of pinnipeds
and manatees, and more than ten-times faster than humans and gerbils. The exceptionally high temporal resolution abilities
of odontocetes are likely due primarily to echolocation capabilities that require rapid processing of acoustic cues. |
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Keywords: | Dolphin Mammal Temporal resolution Auditory evoked potential Modulation rate transfer function |
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