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Ocean Science An interactive open-access journal of the European Geosciences Union

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doi:10.5194/os-2016-48
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
22 Jun 2016
Review status
A revision of this discussion paper was accepted for the journal Ocean Science (OS) and is expected to appear here in due course.
Marine mammal tracks from two-hydrophone acoustic recordings made with a glider
Elizabeth T. Küsel1, Tessa Munoz1, Martin Siderius1, David K. Mellinger2, and Sara Heimlich2 1Northwest Electromagnetics and Acoustics Research Laboratory, Portland State University, 1900 SW 4th Ave, Portland, OR 97201
2Cooperative Institute for Marine Resources Studies, Oregon State University, 2030 Marine Science Drive, Newport, OR 97365
Abstract. A multinational oceanographic and acoustic sea experiment was carried out in the summer of 2014 off the western coast of the island of Sardinia, Mediterranean Sea. During this experiment, an underwater glider was evaluated as a potential tool for recording marine mammal sounds for population density estimation studies. To this end, an acoustic recording system was also tested, comprising two hydrophones connected to an off-the-shelf voice recorder installed inside the glider. Analysis of the recorded acoustic data by a human analyst indicated the presence of sperm whale (Physeter macrocephalus) regular clicks as well as dolphin clicks and whistles. Further analysis of the data consisted in cross-correlating clicks recorded on both data channels for the estimation of the direction (bearing) of clicks, and realization of animal tracks. Insights from this bearing tracking analysis is expected to aid in population density estimation studies by providing further information on animal movement and location.

Citation: Küsel, E. T., Munoz, T., Siderius, M., Mellinger, D. K., and Heimlich, S.: Marine mammal tracks from two-hydrophone acoustic recordings made with a glider, Ocean Sci. Discuss., doi:10.5194/os-2016-48, in review, 2016.
Elizabeth T. Küsel et al.
Elizabeth T. Küsel et al.

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Short summary
An ocean glider was tested during the REP14-MED experiment off the western coast of the Island of Sardinia as a platform for recording sounds produced by whales and dolphins using two sensors. Sperm whale clicks as well as dolphin clicks and whistles were identified in the recordings. Automatically detected sperm whale clicks were used to estimate animal tracks. Such information is useful for marine mammal density estimation studies that use passive acoustics.
An ocean glider was tested during the REP14-MED experiment off the western coast of the Island...
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