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'Eavesdropping' in wild rough-toothed dolphins (Steno bredanensis)?
Thomas Götz1, Ursula Katharina Verfuss, Hans-Ulrich Schnitzler
1Zoological Institute, University of Tübingen Animal Physiology Auf der Morgenstelle 28, 72076 Tübingen, Germany. tg45@st-andrews.ac.uk
Biology Letters
|December 7, 2006
Summary
Dolphins may eavesdrop on sonar signals from their companions. Synchronized swimming in rough-toothed dolphins (Steno bredanensis) may facilitate this information sharing, though less echolocation was detected during these group movements.
Area of Science:
- Marine biology
- Animal behavior
- Bioacoustics
Background:
- Dolphins are hypothesized to use passive listening to interpret sonar signals from conspecifics.
- Evidence for wild dolphin eavesdropping on sonar is limited.
- Rough-toothed dolphins (Steno bredanensis) exhibit unique travel behaviors (synchronized or asynchronous) that could facilitate eavesdropping.
Purpose of the Study:
- To investigate whether dolphins echolocate during synchronized and asynchronous travel.
- To determine if synchronized swimming in dolphins facilitates eavesdropping on conspecific sonar signals.
Main Methods:
- Acoustic recordings were used to detect echolocation signals from rough-to-othed dolphins.
- Echolocation activity was analyzed in relation to observed travel behaviors (synchronized vs. asynchronous).
Main Results:
- Fewer instances of multiple dolphins echolocating were recorded during synchronized travel compared to asynchronous travel.
- This suggests that during synchronized travel, fewer individuals may be actively producing sonar signals.
Conclusions:
- Dolphins in a subgroup may gain information about targets by eavesdropping on the sonar signals of others.
- Synchronized swimming in tight formations could be an energy-efficient adaptation for pelagic species that also aids in eavesdropping.
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