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Updated: Jan 31, 2026
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Bottlenose Dolphin Tursiops truncatus Spermatozoa: Collection, Cryopreservation, and Heterologous In Vitro Fertilization
Published on: August 21, 2017
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Jittered echo-delay resolution in bottlenose dolphins (Tursiops truncatus)
James J Finneran1, Ryan Jones2, Jason Mulsow2
1U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 71510, 53560 Hull St., San Diego, CA, 92152, USA. james.finneran@navy.mil.
Summary
Bottlenose dolphins demonstrated echo-delay resolution capabilities, distinguishing subtle changes in echolocation signals. Their thresholds for detecting jittered echo delays were found to be between 1 and 2 microseconds.
Area of Science:
- Marine Biology
- Bioacoustics
- Animal Behavior
Background:
- Echolocation is a crucial sensory modality for marine mammals like bottlenose dolphins (Tursiops truncatus).
- Understanding echo-delay resolution is key to deciphering how dolphins perceive their environment through sound.
Purpose of the Study:
- To investigate the echo-delay resolution capabilities of bottlenose dolphins using psychophysical methods.
- To compare dolphin echo-delay resolution with findings from similar studies on bats.
Main Methods:
- Two bottlenose dolphins were trained to detect changes in electronic echo delays.
- Stimuli involved fixed delays versus alternating (jittered) echo delays ranging from 0 to 50 microseconds.
- Psychophysical methods were employed to determine jittered echo-delay thresholds.
Main Results:
- Dolphins exhibited jittered echo-delay thresholds between 1 and 2 microseconds.
- Thresholds were higher than predicted for coherent or semicoherent receivers at similar signal-to-noise ratios.
- Dolphins could discriminate echoes when polarity was inverted, even at zero jitter delay.
Conclusions:
- Bottlenose dolphins possess fine-tuned echo-delay resolution abilities.
- Dolphin performance suggests unique processing mechanisms, potentially differing from bat echolocation.
- Further research with finer temporal resolutions and varied signal-to-noise ratios is warranted.
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