Dear MARMAM subscribers,
We are pleased to announce our recent publication:
López-Marulanda J., Adam O., Blanchard T., Vallée M., Cazau D.,
Delfour F. (2017) . First results of an underwater 360° HD audio-video
device for etho-acoustical studies on bottlenose dolphins (/Tursiops
truncatus/). Aquatic Mammals. 43(2), 162-176 DOI:
https://doi.org/10.1578/AM.43.2.2017.162
http://aquaticmammalsjournal.org/index.php?option=com_content&view=article&id=1648:first-results-of-an-underwater-360-hd-audio-video-device-for-etho-acoustical-studies-on-bottlenose-dolphins-tursiops-truncatus&catid=159&Itemid=326
Abstract:
Bottlenose dolphins (Tursiops truncatus) are highly social odontocetes
that live in a fission-fusion society and demonstrate production of a
varied sound repertoire, including clicks, whistles, and burst-pulsed
sounds, as well as a diverse behavioral repertoire. To better
understand the species’ behavior, it is necessary to compare visual
and acoustic observations and link vocalizations to individuals and
their specific actions. However, the task of linking sounds
to individual dolphins is challenging for human observers because
dolphins do not always display specific visual cues when producing a
sound, and also because human hearing is not naturally adapted to
locate underwater sound sources. To respond to these challenges, a new
underwater 360° HD audio-video device, the BaBeL, was designed and
built. This device consists of a five-hydrophone array attached to two
wide-angle video cameras that together cover a 360° field of vision.
Acoustic recordings were analyzed with a customized program to detect
and localize sound sources and to identify individual vocalizing
dolphins. Data from a population of bottlenose dolphins were collected
during 14 boat surveys along the northwest coast of Reunion Island
(France) by following a strict pre-established protocol to standardize
data collection. A total of 21 min of audio-video were recorded when
dolphins were present, and 42 click trains and 42 whistles were
detected from these data. Dolphins identified as vocalizers were also
present for 17% (n = 7) of emitted click trains and 33% (n = 14) of
emitted whistles on the videos. Therefore, an analysis of three video
sequences as examples of the scope of this methodology is presented.
The results show that when the observers stayed ahead and avoided the
direct path of groups of five to nine dolphins, only one animal
emitted click trains while swimming towards the observers or after
turning its rostrum in the humans’ direction, and this dolphin was
never the one leading the group. The benefits of using this
audio-video device for underwater observations of dolphins in clear
water with good visibility are discussed.
Please contact me by email (juliana.lopez-marula...@u-psud.fr
<mailto:juliana.lopez-marula...@u-psud.fr>) for the full text.
I will be glad to send you a pdf copy.
Kind regards,
Université Paris-Sud *Juliana LOPEZ MARULANDA*
PhD student
Bioacoustic Communication Team (http://www.cb.u-psud.fr/index.html)
Institut de NeuroScience Paris Saclay (NeuroPSI), UMR 9197
Bât 446 Rue Claude Bernard
Université Paris-Sud
91405 Orsay cedex
Tel. : 01 69 15 49 64
--
Juliana López Marulanda
Doctorante
Institut de NeuroScience Paris Saclay (NeuroPSI), UMR 9197
Bât 446
Rue Claude Bernard
Université Paris-Sud
91405 Orsay cedex
Tel. : 01 69 15 49 64
_______________________________________________
MARMAM mailing list
MARMAM@lists.uvic.ca
https://lists.uvic.ca/mailman/listinfo/marmam
