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1 February 2014 Differences in sperm whale codas between two waters off Japan: possible geographic separation of vocal clans
Masao Amano, Aya Kourogi, Kagari Aoki, Motoi Yoshioka, Kyoichi Mori
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Abstract

The sperm whale (Physeter macrocephalus) clan is a social unit that shares a similar repertoire of vocalizations called codas. Coda repertoires and clan structure are well studied in sperm whales of the eastern tropical Pacific, but information is limited in the western North Pacific. We compared sperm whale codas recorded from female and immature sperm whales in 2 areas near Japan, off the Kumano Coast and off the Ogasawara Islands, to determine whether different clans exist in these waters. Repertoires of coda types were different between the 2 areas, and the lengths of codas consisting of the same number of clicks were longer in duration near Kumano than near Ogasawara. Our results suggest that different vocal clans inhabit in these 2 areas. Such clear geographic structure of clans is not known in other waters in the Pacific and distinct environmental features may favor a clan in which members share a specific foraging strategy and coda repertoire, both of which likely are transmitted through social learning.

Masao Amano, Aya Kourogi, Kagari Aoki, Motoi Yoshioka, and Kyoichi Mori "Differences in sperm whale codas between two waters off Japan: possible geographic separation of vocal clans," Journal of Mammalogy 95(1), 169-175, (1 February 2014). https://doi.org/10.1644/13-MAMM-A-172
Received: 13 July 2013; Accepted: 1 August 2013; Published: 1 February 2014
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