[MARMAM] New publication: The functional role of Heaviside's dolphin (Cephalorhynchus heavisidii) rapidly pulsed signals

Morgan J. Martin mjmartin at sandiego.edu
Sun Mar 10 09:11:14 PDT 2019

Dear MARMAM Members,

My co-authors and I are very pleased to announce the publication of
our new manuscript "To buzz or burst-pulse? The functional role of
Heaviside's dolphin, *Cephalorhynchus heavisidii,* rapidly pulsed
signals" published in the Journal of Animal Behaviour. This study is
the first to examine relationships between the surface and acoustic
behaviours of Heaviside's dolphins. The reference and abstract are
provided below. The article is available online now and will appear in
the April issue of Animal Behaviour.

Martin, M.J., Elwen, S.H., Kassanjee, R., Gridley, T. (2019). To buzz
or burst-pulse? The functional role of Heaviside's dolphin,
*Cephalorhynchus heavisidii,* rapidly pulsed signals. *Animal
Behaviour*. DOI: 10.1016/j.anbehav.2019.01.007

Abstract: Four groups of toothed whales have independently evolved to
produce narrowband high-frequency (NBHF) echolocation signals (i.e.
clicks) with a strikingly similar waveform and centroid frequency
around 125 kHz. These signals are thought to help NBHF species avoid
predation by echolocating and communicating at frequencies inaudible
to predators, a form of acoustic crypsis. Heaviside's dolphins produce
NBHF echolocation clicks in trains and often in rapid succession in
the form of buzzes. In addition, a second click type with a lower
frequency and broader bandwidth was recently described, typically
emitted in rapid succession in the form of burst-pulses. We
investigated the relationship between buzz and burst-pulse signals and
both surface behaviour (foraging, ‘interacting with the kayak’ and
socializing) and group size, using a multivariable regression on the
signal occurrence and signal count data. Signal occurrence and counts
were not related to group size in the regression analysis.
Burst-pulses were strongly linked to socializing behaviour, occurring
more often and more frequently during socializing and much less during
foraging. Buzz vocalizations were not strongly linked to a specific
behaviour although there was some evidence of an increase in
production during foraging and socializing. In addition, individual
level production rates of buzzes during foraging and socializing, and
burst-pulses during socializing decreased with increasing group size.
Temporally patterned burst-pulse signals were also identified, often
occurring within a series of burst-pulses and were directly linked to
specific events such as aerial leaping, backflipping, tail slapping
and potential mating. Our findings suggest Heaviside's dolphins have a
more complex communication system based on pulsed vocalizations than
previously understood, perhaps driven by the need to facilitate the
social interactions of this species.

The paper is available online at: https://doi.org/10.1016/j.anbehav.2019.01.007
A PDF is also available upon email request to: mjmartin at sandiego.edu

Many thanks,
Morgan Martin on behalf of my co-authors
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