Coda vocalizations recorded in breeding areas are almost entirely produced by mature female sperm whales ( Physeter macrocephalus)

• Published in: Canadian Journal of Zoology
• Main Authors: Marcoux, Marianne, Whitehead, Hal, Rendell, Luke
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 2006
• Subjects: Physeter macrocephalus
• Online Access: http://dx.doi.org/10.1139/z06-035; http://www.nrcresearchpress.com/doi/full-xml/10.1139/z06-035; http://www.nrcresearchpress.com/doi/pdf/10.1139/z06-035

We investigated the use and function of coda communication by sperm whales ( Physeter macrocephalus L., 1758 (= Physeter catodon L., 1758)). Codas are stereotyped patterns of clicks often made by sperm whales in social contexts. We used the pulsed structure of coda clicks recorded from socializing female/immature groups to estimate the body-length distribution of the animals producing the codas. Ninety-five percent of the 10 653 codas that we measured were produced by whales measuring from 9 to 11 m. This size range corresponds to the lengths of mature females. We compared these data to a length distribution calculated from photographic measurements of individuals from the same groups encountered during the same studies. There were more whales shorter than 8.5 m (10.0%) and longer than 12.5 m (2.7%) in the photographic length distribution than in that of the coda producers (0.30% and 0.08%, respectively). Since males leave their natal group when they are shorter than 9 m and return to breeding areas when they measure 13 m or more, our data show that the codas were produced almost entirely by mature females. We suggest that coda communication serves several functions, including social bonding.