Dear all,We are very pleased to announce the publication (early view online) of
the following paper in Marine Mammal Science: M.V. Reyes Reyes, V.P.
Tossenberger, M.A. Iñiguez, J.A. Hildebrand and M.L. Melcón. "Communication
sounds of Commerson's dolphins (Cephalorhynchus commersonii) and contextual use
of vocalizations". DOI: 10.1111/mms.12321
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 Bah ıa San Juli an, which are apparently safe
from predation, remains unknown.
You can access the paper at the URL
http://onlinelibrary.wiley.com/doi/10.1111/mms.12321/pdf. Otherwise, send an
email to vanesa.re...@cethus.org for a PDF copy.
All the best,Vanesa (on behalf of all co-authors).
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