Communication sounds of Commerson's dolphins (Cephalorhynchus commersonii) and contextual use of vocalizations

TitleCommunication sounds of Commerson's dolphins (Cephalorhynchus commersonii) and contextual use of vocalizations
Publication TypeJournal Article
Year of Publication2016
AuthorsReyes M.VR, Tossenberger V.P, Iniguez M.A, Hildebrand JA, Melcon M.L
JournalMarine Mammal Science
Volume32
Pagination1219-1233
Date Published2016/10
Type of ArticleArticle
ISBN Number0824-0469
Accession NumberWOS:000388631400003
Keywordsacoustic behavior; Bahia San Julian; bottle-nosed dolphins; Cephalorhynchus commersonii; Commerson's dolphin; communication; echolocation; harbor porpoises; high-frequency clicks; narrow-band; orcinus-orca; phocoena-phocoena; signals; signature whistles; tursiops-truncatus; vocalizations; wild
Abstract

Cetaceans produce a variety of vocalizations to communicate; however, little information exists on the acoustic behavior displayed by Commerson's dolphins (Cephalorhynchus commersonii) in the wild other than their echolocation behavior. Most available literature suggests that Commerson's dolphins do not produce any other sound type besides narrow-band high-frequency (NBHF) clicks, such that no signals are emitted below 100 kHz. We conducted acoustic recordings together with sightings to study the acoustic behavior of Commerson's dolphins in Bahia San Julian, Argentina. This is the first study that provides evidence that this species produces a variety of acoustic signals, including whistles and broad-band clicks (BBC), with frequency content well below 100 kHz. Whistles were recorded mostly in the presence of mother and calf and were associated with parental behavior. BBC may be used for communication purposes by adults. These vocalizations are within the hearing range of killer whales and so could pose a risk of predation for Commerson's dolphins. Whether this population of Commerson's dolphins produce all these types of signals while they are in the open sea out of the waters of Bahia San Julian, which are apparently safe from predation, remains unknown.

DOI10.1111/mms.12321
Short TitleMar. Mamm. Sci.
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