Click communication in wild harbour porpoises (Phocoena phocoena)

Social delphinids employ a vocal repertoire of clicks for echolocation and whistles for communication. Conversely, the less social and acoustically cryptic harbour porpoises (Phocoena phocoena) only produce narrow-band high-frequency (NBHF) clicks with properties that appear poorly suited for commun...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Sorensen, P. M., Wisniewska, D. M., Jensen, F. H., Johnson, Mark Peter, Teilmann, J., Madsen, P. T.
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
BOTTLE-NOSED DOLPHINS
HIGH-FREQUENCY CLICKS
SIGNATURE WHISTLE USE
NARROW-BAND
TURSIOPS-TRUNCATUS
ORCINUS-ORCA
BEHAVIORAL AUDIOGRAMS
ACOUSTIC BEHAVIOR
TOOTHED WHALES
ECHOLOCATION
Orca
Orcinus orca
Phocoena phocoena
toothed whales
Online Access:https://pure.au.dk/portal/da/publications/click-communication-in-wild-harbour-porpoises-phocoena-phocoena(7856c6ea-9ecc-4542-812b-d3523192cf86).html
https://doi.org/10.1038/s41598-018-28022-8
https://pure.au.dk/ws/files/130150292/s41598_018_28022_8.pdf
http://www.scopus.com/inward/record.url?scp=85049179110&partnerID=8YFLogxK
Description
Summary:Social delphinids employ a vocal repertoire of clicks for echolocation and whistles for communication. Conversely, the less social and acoustically cryptic harbour porpoises (Phocoena phocoena) only produce narrow-band high-frequency (NBHF) clicks with properties that appear poorly suited for communication. Nevertheless, these small odontocetes likely mediate social interactions, such as mate choice and mother-calf contact, with sound. Here, we deployed six tags (DTAG3) on wild porpoises in Danish waters for a total of 96 hours to investigate if the patterns and use of stereotyped NBHF click trains are consistent with a communication function. We show that wild porpoises produce frequent (up to 27 . min(-1)), high-repetition rate click series with repetition rates and output levels different from those of foraging buzzes. These sounds are produced in bouts and frequently co-occur with emission of similar sounds by nearby conspecifics, audible on the tags for >10% of the time. These results suggest that social interactions are more important to this species than their limited social encounters at the surface may indicate and that these interactions are mediated by at least two broad categories of calls composed of short, high-repetition rate click trains that may encode information via the repetition rate of their stereotyped NBHF clicks.

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