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Related Concept Videos

Communication01:03

Communication

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Bottlenose dolphin communication during a role-specialized group foraging task.

Rebecca A Hamilton1, Stefanie K Gazda2, Stephanie L King3

  • 1School of Health Sciences, University of Manchester, Manchester, UK; Department of Biology, University of Massachusetts Dartmouth, MA, USA.

Behavioural Processes
|June 24, 2022
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Summary

Bottlenose dolphins use echolocation to coordinate specialized hunting roles. Increased whistle vocalizations before group feeding suggest communication for task coordination in this unique mammal behavior.

Keywords:
Bottlenose dolphinsCetaceansCommunicationDivision of laborDriver-barrier feedingRole specialization

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Area of Science:

  • Marine biology
  • Animal behavior
  • Bioacoustics

Background:

  • Role specialization in group tasks is common in humans but rare in non-eusocial mammals.
  • Bottlenose dolphins exhibit role specialization in a cooperative feeding strategy known as driver-barrier hunting.

Purpose of the Study:

  • To investigate the acoustic cues and signals used by bottlenose dolphins to coordinate driver-barrier feeding.
  • To determine if vocalizations play a role in the synchronization of specialized behaviors in dolphins.

Main Methods:

  • Recorded and analyzed vocalizations (whistles and echolocation) during 81 driver-barrier feeding events.
  • Correlated dolphin vocalizations with fine-scale audio and video analysis of coordinated movements.
  • Compared whistle occurrence during driver-barrier feeding with a non-specialized foraging technique.

Main Results:

  • Barrier dolphins appear to coordinate movements by using the driver dolphin's echolocation.
  • Whistle production significantly increased immediately before driver-barrier events compared to other foraging methods.
  • Echolocation and whistles may serve distinct roles in coordinating cooperative hunting.

Conclusions:

  • This study provides the first evidence of vocalizations coordinating role-specialized behavior in a non-human mammal.
  • Dolphin echolocation is used for spatial coordination, while whistles may signal intent or recruit participants.
  • Cooperative hunting in bottlenose dolphins involves sophisticated acoustic communication and coordination.