I beg your pardon? Acoustic behaviour of a wild solitary common dolphin who interacts with harbour porpoises. Issue 5 (3rd September 2022)

• Record Type: Journal Article
• Authors: Cosentino, Mel; Nairn, David; Coscarella, Mariano; Jackson, Joseph C.; Windmill, James F. C.
• Is Part Of: Bioacoustics. Volume 31:Issue 5(2022)
• Page Start: 517
• Page End: 534
• Publication Date: 2022-09-03
• Subjects: Interspecific interactions -- vocal learning -- vocal convergence -- cetaceans -- NBHF clicks; Bioacoustics -- Periodicals; Sound production by animals -- Periodicals; Animal sounds -- Periodicals; Sound recordings -- Periodicals; 591.59405
• DOI: 10.1080/09524622.2021.1982005
• Languages: English
• ISSNs: 0952-4622

Abstract

ABSTRACT: Kylie is a solitary common dolphin who inhabits a restricted area within the Firth of Clyde (Scotland). She spends most of her time around navigational buoys in the Hunterston/Fairlie channel, where she has been seen interacting with harbour porpoises. Recordings from 2016 and 2017 were used to study her acoustic behaviour when seen alone and with a porpoise. Clicks were classified as potential porpoise or dolphin clicks based on the waveform, power spectrum, and spectrogram, as well as direction of arrival, inter-click interval, amplitude, and centroid frequency variations. Kylie emitted clicks exclusively, which were of variable nature, including low, mid, and high-frequency (HF, centroid frequency > 100 kHz) as well as broad or narrowband. Some of Kylie's HF clicks were similar to porpoise clicks both in the time (e.g. polycyclic) and frequency (e.g. narrowband with most energy between 100 and 150 kHz) domains, which cannot fully be explained by recording geometry and directionality effects.