Dolphins Call Their Friends By Names, Signature Whistles Form Unique Names Used For A Lifetime
A study, by Dr Vincent Janik of the University’s Sea Mammal Research Unit and his colleagues in the USA, suggests that dolphins share the human characteristic of recognizing themselves as individuals with separate identities.
The study provides compelling evidence that a dolphin’s learned identity signal is used as a label when addressing conspecifics. Bottlenose dolphins therefore appear to be unique as nonhuman mammals to use learned signals as individually specific labels for different social companions in their own natural communication system.
The researchers studied a group of bottlenose dolphins in Sarasota Bay, Florida and found that not only do they appear to convey information about themselves by their whistle, but they seem to recognise each other’s unique whistle. Recognition of the signature whistle can be compared to humans recognizing a name.
Dr Janik, a research fellow at the School’s Sea Mammal Research Unit (SMRU), said: ”As infants, bottlenose dolphins develop their own signature whistles to use throughout their lifetimes. Group members repeat these whistles back during vocal interactions, and we believe that the whistles form a system similar to that of human names.”
The researchers played synthetic whistles to dolphins through an underwater speaker. In 9 out of 14 cases, the dolphin would turn more often toward the speaker if it heard a whistle resembling that of a close relative, demonstrating that the synthetic signature whistle contains information that is used by the listeners to identify the caller.
Since dolphins reacted less to synthetic whistles of unrelated dolphins, the research suggests that dolphins use unique signature whistles to keep track of friends and family and maintain group cohesion.
Dr Janik concluded: “Since voice features are affected by changing water pressure, voice-independent names might be a reliable way to convey identity.”
The study is published in the Proceedings of the National Academy of Sciences.
Contacts and sources:
University of St. Andrews
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